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Table Of Contents
Release Notes for Cisco 1700 Series Routers for Cisco IOS Release 12.3(7)XR
Determining the Software Version
Upgrading to a New Software Release
New Software Features in Release 12.3(7)XR7
New Software Features in Release 12.3(7)XR6
New Software Features in Release 12.3(7)XR5
New Software Features in Release 12.3(7)XR4
New Software Features in Release 12.3(7)XR3
New Software Features in Release 12.3(7)XR2
New Software Features in Release 12.3(7)XR1
New Software Features in Release 12.3(7)XR
X.25 Station Type for ISDN D-Channel Interface
SAA ICMP Echo Operation Enhancement
Easy VPN Remote Phase 4.0 Enhancements
Easy VPN Remote Phase 4.1 Enhancements
New Software Features in Release 12.3(7)T
Resolved Caveats - Release 12.3(7)XR7
Resolved Caveats - Release 12.3(7)XR6
Resolved Caveats - Release 12.3(7)XR5
Resolved Caveats - Cisco IOS Release 12.3(7)XR4
Resolved Caveats - Cisco IOS Release 12.3(7)XR3
Caveats - Cisco IOS Release 12.3(7)XR2
Caveats - Cisco IOS Release 12.3(7)XR1
Caveats - Cisco IOS Release 12.3(7)XR
Cisco IOS Software Documentation Set
Cisco IOS Release 12.3 Documentation Set Contents
Obtaining Documentation, Obtaining Support, and Security Guidelines
Release Notes for Cisco 1700 Series Routers for Cisco IOS Release 12.3(7)XR
August 13, 2007Cisco IOS Release 12.3(7)XR7OL-8393-04These release notes describe new features and significant software components for the Cisco 1700 series routers that support the Cisco IOS Release 12.3(7)T, up to and including Cisco IOS Release 12.3(7)XR7. These release notes are updated as needed to describe new memory requirements, new features, new hardware support, software platform deferrals, microcode or modem code changes, related document changes, and any other important changes. Use these release notes with the Cross-Platform Release Notes for Cisco IOS Release 12.3T located on Cisco.com.
For a list of the software caveats that apply to Cisco IOS Release 12.3(7)XR7, see the "Caveats" section and Caveats for Cisco IOS Release 12.3(7)T. The online caveats document is updated for every maintenance release and is located on Cisco.com.
Contents
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Obtaining Documentation, Obtaining Support, and Security Guidelines
System Requirements
This section describes the system requirements for Cisco IOS Cisco IOS Release 12.3(7)XR6 and includes the following:
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Memory Requirements
This section describes the memory requirements for the Cisco IOS feature sets that are supported by the Cisco IOS Release 12.3(7)XR6 on the Cisco 1700 series routers.
Table 1 and Table 2 describes the memory requirements for the Cisco 1700 series routers.
Hardware Supported
Cisco IOS Cisco IOS Release 12.3(7)XR6 supports the following Cisco 1700 series routers:
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The Cisco 1701, Cisco 1710, Cisco 1711, Cisco 1712, and Cisco 1721routers run only data images. The Cisco 1751, Cisco 1751-V, and Cisco 1760 routers run data or data-and-voice images, providing digital and analog voice support. The Cisco 1720 router runs the Cisco 1700 IOS IP and the Cisco 1700 IOS IP/ADSL images only. The Cisco 1711 and Cisco 1712 routers run select IP Security (IPSec) Triple Data Encryption Standard (3DES) images only (the Cisco 1700 IOS IP/ADSL/IPX/AT/IBM/FW/IDS PLUS IPSEC 3DES, the Cisco 1700 IOS IP/ADSL/FW/IDS PLUS IPSEC 3DES, the Cisco 1700 IOS ADVANCED SECURITY, the Cisco 1700 IOS ADVANCED IP SERVICES, and the Cisco 1700 IOS ADVANCED ENTERPRISE SERVICES images).
For descriptions of existing hardware features and supported modules, see the hardware installation guides, configuration and command reference guides, and additional documents specific to the Cisco 1700 series routers, which are available on Cisco.com.
For the Cisco 1700 series routers, click the following path:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1700/index.htm
This URL is subject to change without notice. If it changes, point your web browser to Cisco.com, and click the following paths:
For the Cisco 1700 series routers:
Technical Documentation: Routers: Modular Access Routers: Cisco 1700 Series Routers: <platform_name>
Determining the Software Version
To determine which version of Cisco IOS software is currently running on your Cisco 1700 series router, log in to the router and enter the show version command. Using the 1700 series router as an example, the following sample output from the show version command indicates the version number.
router> show versionCisco Internetwork Operating System SoftwareIOS (tm) C1700 Software (C1700-Y7-MZ), Version 12.4(11)XJ6, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)Synched to technology version 12.3(7.11)TUpgrading to a New Software Release
For general information about upgrading to a new software release, see Cisco IOS Software Releases 12.3 T Installation and Upgrade Procedures located on Cisco.com.
Feature Set Tables
The Cisco IOS software is packaged in feature sets consisting of software images, depending on the platform. Each feature set contains a specific set of Cisco IOS features. Cisco IOS Release 12.3(7)XR6 supports the same feature sets as Releases 12.3 and 12.3(7)T.
Caution
Table 3 through Table 6 list the feature and feature sets supported in the Cisco IOS Cisco IOS Release 12.3(7)XR6.
The tables use the following conventions:
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Note
Table 4 Feature Set of the Cisco 1700 Legacy Feature Set for Cisco 17201 , 1721, 1751, 1751-V, and 1760 Routers
IBM PLUS
IDS PLUS IPSEC 3DESConfigurable X.25 Station Type for ISDN D-channel Interface
12.4(11)XJ
Yes
Yes
Yes
Yes
Yes
Yes
SAA ICMP Echo Operation Enhancement
12.4(11)XJ
Yes
Yes
Yes
Yes
Yes
Yes
Easy VPN with 802.1x Authentication
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote with Certificates
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote Backup Server List Autoconfiguration
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote Management Enhancements
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote Load Balancing
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote VLAN Support
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote Multiple Subnet Support
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote and Server on Same Interface
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote and Site to Site on Same Interface
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Perfect Forward Secrecy (PFS) via Policy Push
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Dial Backup
12.4(11)XJ
No
No
No
No
Yes
Yes
Easy VPN Remote Traffic Triggered Activation
12.4(11)XJ
No
No
No
No
Yes
Yes
1 The Cisco 1720 router runs IP and IP/ADSL images only.
Table 6 Feature Set of the Cross-Platform Feature Set for Cisco 1701, 1711, 1712, 1721, 1751, 1751-V, and 1760 Routers
Configurable X.25 Station Type for ISDN D-channel Interface
12.4(11)XJ
Yes
Yes
Yes
SAA ICMP Echo Operation Enhancement
12.4(11)XJ
Yes
Yes
Yes
Easy VPN with 802.1x Authentication
12.4(11)XJ
No
Yes
No
Easy VPN Remote with Certificates
12.4(11)XJ
No
Yes
No
Easy VPN Remote Backup Server List Autoconfiguration
12.4(11)XJ
No
Yes
No
Easy VPN Remote Management Enhancements
12.4(11)XJ
No
Yes
No
Easy VPN Remote Load Balancing
12.4(11)XJ
No
Yes
No
Easy VPN Remote VLAN Support
12.4(11)XJ
No
Yes
No
Easy VPN Remote Multiple Subnet Support
12.4(11)XJ
No
Yes
No
Easy VPN Remote and Server on Same Interface
12.4(11)XJ
No
Yes
No
Easy VPN Remote and Site to Site on Same Interface
12.4(11)XJ
No
Yes
No
Easy VPN Perfect Forward Secrecy (PFS) via Policy Push
12.4(11)XJ
No
Yes
No
Easy VPN Dial Backup
12.4(11)XJ
No
Yes
No
Easy VPN Remote Traffic Triggered Activation
12.4(11)XJ
No
Yes
No
1 This image is supported only on Cisco 1751, 1751-V, and 1760 routers.
New and Changed Information
The following sections list the new information about the Cisco 1700 series routers for Cisco IOS Release 12.3(7)XR. This information applies to Cisco IOS Releases 12.3(7)XR, 12.3(7)XR1, 12.3(7)XR2, 12.3(7)XR3, 12.3(7)XR4, 12.3(7)XR5, and 12.3(7)XR6.
New Software Features in Release 12.3(7)XR7
The Cisco IOS Release 12.3(7)XR7 supports the same software features that are supported in the
Cisco IOS Release 12.3(7)XR6.New Software Features in Release 12.3(7)XR6
The Cisco IOS Release 12.3(7)XR6 supports the same software features that are supported in the
Cisco IOS Release 12.3(7)XR5.New Software Features in Release 12.3(7)XR5
The Cisco IOS Release 12.3(7)XR5 supports the same software features that are supported in the
Cisco IOS Release 12.3(7)XR4.New Software Features in Release 12.3(7)XR4
The Cisco IOS Release 12.3(7)XR4 supports the same software features that are supported in the Cisco IOS Release 12.3(7)XR3.
New Software Features in Release 12.3(7)XR3
The Cisco IOS Release 12.3(7)XR3 supports the same software features that are supported in the Cisco IOS Release 12.3(7)XR2.
New Software Features in Release 12.3(7)XR2
The Cisco IOS Release 12.3(7)XR2 supports the same software features that are supported in the Cisco IOS Release 12.3(7)XR1.
New Software Features in Release 12.3(7)XR1
The Cisco IOS Release 12.3(7)XR1 supports the same software features that are supported in the Cisco IOS Release 12.3(7)XR.
New Software Features in Release 12.3(7)XR
The following sections describe the new software features supported by the Cisco 1700 series routers for Release 12.3(7)XR.
X.25 Station Type for ISDN D-Channel Interface
The X.25 Station Type for ISDN D-channel Interface feature permits configuration of the X.25 station type for the ISDN D-channel interface with the encapsulation x25 command on this interface. This feature allows the mapping of closed user group (CUG) of the X.25 packets that originates from the point-of-sale devices terminating the ISDN-BRI D-channel interface configured as an X.25 data communications equipment (DCE) station of Cisco routers with an ISDN BRI interface.
The default encapsulation of the BRI D-channel interface is X.25 encapsulation in data terminal equipment (DTE) mode.
For more details, see the following URL:
SAA ICMP Echo Operation Enhancement
The Service Assurance Agent (SAA) Internet Control Message Protocol (ICMP) Echo operation is enhanced to allow user to specify the interface whose IP address should be used as source IP address. It introduces a new keyword source interface to the type echo protocol command-line interface (CLI) to specify the interface whose IP address will be used as source IP address.
The command syntax is as follows:
type echo protocol protocol-type target {[source-ipaddr ip-address] | source-interface interface-name}
Easy VPN Remote Phase 4.0 Enhancements
The following sections describe the Easy Virtual Private Network (VPN) Remote Phase 4.0 feature enhancements.
Easy VPN with 802.1x Authentication
The Easy VPN with 802.1x Authentication feature enables split tunneling, which makes it possible for a corporate employee to connect to the corporate network while other persons using the same Internet connection will not have access to the protected tunnel to the corporate network.
For more information, see the following URL:
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/cliet_wp.htm
Easy VPN Remote with Certificates
Cisco IOS Release 12.3(7)XR and later releases support the Easy VPN Remote with Certificates feature, which uses public key infrastructure (PKI) and certificates to establish an IP Security (IPSec) connection.
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Easy VPN Remote Backup Server List Autoconfiguration
The Easy VPN Remote feature allows configuration of multiple servers that the remote router will attempt to connect to. With this feature, the Easy VPN Server can "push" the server list to Easy VPN Remote clients, thus eliminating the need to manually configure the list of servers on all the Easy VPN Remote clients. Instead, only one server needs to be preconfigured on Easy VPN Remote client, and the rest of the server list will be pushed from the server to Easy VPN Remote client once the connection is established.
Easy VPN Remote Management Enhancements
The Easy VPN Remote Management Enhancements feature simplifies the remote management of a Cisco IOS router that is acting as an Easy VPN Remote. This feature makes fully manageable the IP address that is pushed from the server at connect time. The pushed address is automatically assigned to a loopback interface that is dynamically created. This enables ping, Telnet, Simple Network Management Protocol (SNMP), and even dynamic routing to use the pushed IP address as the IP address for reaching the router. The user can design central site management solutions that use the pushed IP address as the IP address for reaching the remote routers. The Easy VPN Remote Management Enhancements feature can be enabled in both client and network extension modes.
Easy VPN Remote Load Balancing
When configured with the Easy VPN Remote Load Balancing feature, an Easy VPN server will accept an incoming request from the Easy VPN Remote router at its virtual IP address. When the server is heavily loaded, it will send a "notify" message to the remote router which contains an IP address that represents a new peer that the client can connect to. The Easy VPN Remote router receives this "redirect" message and will attempt to connect to a different server at the address contained in the notify message.
Easy VPN Remote VLAN Support
The Easy VPN Remote Virtual LAN (VLAN) Support feature allows you to define a VLAN as an Easy VPN Remote inside, or private interface. This VLAN may be an internal VLAN on the remote router. That is, when defined, IP Security (IPSec) security association (SA) will be established for the VLAN inside interface.
Easy VPN Remote Multiple Subnet Support
The Easy VPN Remote Multiple Subnet Support feature allows multiple subnets to be defined to Easy VPN on a single inside interface on the Easy VPN remote router. The subnets can be multiple hops away from the inside LAN interface. The subnets must be manually configured because they cannot be learned by dynamic routing. The Easy VPN Remote Multiple Subnet Support feature is supported in client mode only.
Easy VPN Remote and Server on Same Interface
The Easy VPN Remote and Server on Same Interface features allows you to configure Easy VPN Remote functions and Easy VPN Server functions on the same interface. A typical application is a remote router that acts as a client to the Easy VPN server at headquarters, while also acting as a server for local software clients. Such a router has a single public interface to the Internet; both the server and client functions are configured on the same interface.
Easy VPN Remote and Site to Site on Same Interface
The Easy VPN Remote and Site to Site on Same Interface feature allows you to configure Easy VPN Remote functions and site-to-site (standard IPSec) functions on the same interface. A typical application is a remote router that acts as a client to the Easy VPN server at headquarters, while also having a site-to-site tunnel.
Easy VPN Perfect Forward Secrecy (PFS) via Policy Push
The Easy VPN Perfect Forward Secrecy (PFS) via Policy Push feature allows PFS for the Easy VPN connection to be configured dynamically the connect time by means of MODCFG policy push from the server.
Easy VPN Remote Phase 4.1 Enhancements
The following sections describe the Easy Virtual Private Network (VPN) Remote Phase 4.1 feature enhancements.
Easy VPN Dial Backup
The Easy VPN Dial Backup feature enables Cisco IOS software to identify when the primary Internet connection goes down and initiate a dial-on-demand routing (DDR) connection to a preconfigured destination from any alternative WAN/LAN port. The Easy VPN Dial Backup feature is typically used for deployments in which a remote router has a single dedicated VPN connection over the Internet, but can dial up to an ISP if the primary link goes down.
The Easy VPN Dial Backup feature allows an object to be tracked (by IP address or host name) by means of periodic pings and allows installation or removal of the static route, based on the state of the tracked object. If the Internet connectivity is lost—that is, if the pings fail—the default route for the primary interface is removed and the floating static route for the backup interface becomes the preferred route. This triggers the dialer interface to come up and connect to the ISP. While in backup mode, the pings are still sent to the primary interface. When the ping is successful, again the primary connection will be restored and back up tunnel will be disconnected. The dial-up connection will time out, based on the idle timer settings of the dialer interface.
An advantage of the Easy VPN Dial Backup feature is it works without requiring that a dynamic routing protocol t o be running across the VPN to test connectivity.
Easy VPN Remote Traffic Triggered Activation
The Easy VPN Remote Traffic Triggered Activation feature introduces a new method of activating Easy VPN tunnels, based on the user traffic.This feature brings up the tunnel only when there is traffic. This feature can also be used with an idle timer on the tunnel to bring the tunnel up or down when required.
New Software Features in Release 12.3(7)T
For information regarding the features supported in Cisco IOS Release 12.3(7)T, see the Cross-Platform Release Notes and New Feature Documentation links at the following location on Cisco.com:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123relnt/xprn123/index.htm
This URL is subject to change without notice. If it changes, point your web browser to Cisco.com, and click the following path:
Service & Support: Technical Documents: Cisco IOS Software: Release 12.3: Release Notes: Cross-Platform Release Notes (Cisco IOS Release 12.3(7)T)
Caveats
Caveats describe unexpected behavior or defects in the Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.
Caveats in Cisco IOS Release 12.3(7)T are also in Cisco IOS Release 12.3(7)XR. For information on caveats in Cisco IOS Release 12.3(2)T, see the Caveats for Cisco IOS Release 12.3(7)T document. This document lists severity 1 and 2 caveats; the documents is located on Cisco.com.
Note
Resolved Caveats - Release 12.3(7)XR7
CSCsf04754Multiple Cisco products contain either of two authentication vulnerabilities in the Simple Network Management Protocol version 3 (SNMPv3) feature. These vulnerabilities can be exploited when processing a malformed SNMPv3 message. These vulnerabilities could allow the disclosure of network information or may enable an attacker to perform configuration changes to vulnerable devices. The SNMP server is an optional service that is disabled by default. Only SNMPv3 is impacted by these vulnerabilities. Workarounds are available for mitigating the impact of the vulnerabilities described in this document.
The United States Computer Emergency Response Team (US-CERT) has assigned Vulnerability Note VU#878044 to these vulnerabilities.
Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-0960 has been assigned to these vulnerabilities.
This advisory will be posted at http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml
sCSCsj44081 Improvements in diagnostics and instrumentationSymptom Cisco IOS Software has been enhanced with the introduction of additional software checks to signal improper use of internal data structures. This enhancement was introduced in select Cisco IOS Software releases published after April 5, 2007.
Details With the new enhancement in place, IOS will emit a %DATACORRUPTION-1-DATAINCONSISTENCY error message whenever it detects an inconsistency in its internal data structures. This is a new error message. The following is an example.
The %DATACORRUPTION-1-DATAINCONSISTENCY error message is preceded by a timestamp
May 17 10:01:27.815 UTC: %DATACORRUPTION-1-DATAINCONSISTENCY: copy error
The error message is then followed by a traceback.
It is important to note that this error message does not imply that packet data is being corrupted. It does, however provide an early indicator of other conditions that can eventually lead to poor system performance or an IOS restart.
Recommended Action Collect "show tech-support" command output and open a service request with the Technical Assistance Center (TAC) or designated support organization. Pay particular attention to any other error messages or error symptoms that accompany the%DATACORRUPTION-1-DATAINCONSISTENCY message and note those to your support contact.
CSCsc44237 memory leak in client applications iterating over an empty idb listThis caveat consists of two symptoms, two conditions, and two workarounds:
Symptom 1: A switch or router that is configured with a PA-A3 ATM port adapter may eventually run out of memory. The leak occurs when the FlexWAN or VIP that contains the PA-A3 port adapter is removed from the switch or router and not re-inserted.
The output of the show processes memory command shows that the "ATM PA Helper" process does not have sufficient memory. The output of the show memory allocating-process totals command shows that the "Iterator" process holds the memory.
Condition 1: This symptom is observed on a Cisco switch or router that runs a Cisco IOS software image that contains the fixes for caveats CSCeh04646 and CSCeb30831. A list of the affected releases can be found at http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCeh04646 and http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCeb30831.
Cisco IOS software releases that are not listed in the "First Fixed-in Version" fields at these locations are not affected.
Workaround 1: Either do not remove the PA-A3 ATM port adapter from the FlexWAN or VIP or re-insert the PA-A3 ATM port adapter promptly. The memory leak stops immediately when you re-insert the PA-A3 ATM port adapter.
Symptom 2: A switch or router that has certain PIM configurations may eventually run out of memory. The output of the show processes memory command shows that the "PIM process" does not have sufficient memory. The output of the show memory allocating-process totals command shows that the "Iterator" process holds the memory.
Condition 2: This symptom observed on a Cisco router that runs a Cisco IOS software image that contains the fix for caveat CSCef50104.
A list of the affected releases can be found at http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCef50104.
Cisco IOS software releases that are not listed in the "First Fixed-in Version" field at this location are not affected.
Workaround 2: When the ip multicast-routing command is configured, enable at least one interface for PIM. When the ip multicast-routing vrf vrf-name command is configured, enter the ip vrf forwarding vrf-name command on at least one interface that has PIM enabled.
CSCsi67763 IPS evasion using Unicode encoding for HTTP-based attacksSymptom The U.S. Computer Emergency Response Team (US-CERT) has reported a network evasion technique using full-width and half-width unicode characters that affects several Cisco products. The US-CERT advisory is available at the following link:
http://www.kb.cert.org/vuls/id/739224
By encoding attacks using a full-width or half-width unicode character set, an attacker can exploit this vulnerability to evade detection by an Intrusion Prevention System (IPS) or firewall. This may allow the attacker to covertly scan and attack systems normally protected by an IPS or firewall.
Cisco response is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sr-20070514-unicode.shtml
CSCsg16908 IOS FTP Server DeprecationSymptom Multiple vulnerabilities exist in the Cisco IOS File Transfer Protocol (FTP) Server feature. These vulnerabilities include Denial of Service, improper verification of user credentials and the ability to read or write any file in the device's filesystem, including the device's saved configuration, which may include passwords or other sensitive information.
The IOS FTP Server is an optional service that is disabled by default. Devices that are not specifically configured to enable the IOS FTP Server service are unaffected by these vulnerabilities.
This vulnerability does not apply to the IOS FTP Client feature.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070509-iosftp.shtml.
CSCin95836 aarun Buffer overflow in NHRP protocolThe Cisco Next Hop Resolution Protocol (NHRP) feature in Cisco IOS?? contains a vulnerability that can result in a restart of the device or possible remote code execution.
NHRP is a primary component of the Dynamic Multipoint Virtual Private Network (DMVPN) feature.
NHRP can operate in three ways: at the link layer (Layer 2), over Generic
Routing Encapsulation (GRE) and multipoint GRE (mGRE) tunnels and directly on IP (IP protocol number 54). This vulnerability affects all three methods of operation.
NHRP is not enabled by default for Cisco IOS.
This vulnerability is addressed by Cisco bug IDs CSCin95836 for non-12.2 mainline releases and CSCsi23231 for 12.2 mainline releases.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-nhrp.shtml.
CSCsf08998 MGCP stop responding after receiving malformed packetMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCse68138 Issue in handling specific packets in VOIP RTP LibMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCsb93407 H323 port tcp 1720 still listening after call service stopSymptom When H323 call service stops, the router still listens on TCP port 1720 and completes connection attempts.
Conditions
Workaround
For information about deploying access lists, see the "Transit Access Control Lists: Filtering at Your Edge" document at http://www.cisco.com/warp/public/707/tacl.html
For further information about deploying access lists, see the "Protecting Your Core: Infrastructure Protection Access Control Lists" document at http://www.cisco.com/warp/public/707/iacl.html.
For information about using control plane policing to block access to TCP port 1720, see the "Deploying Control Plane Policing White Paper" at http://www.cisco.com/en/US/products/ps6642/products_white_paper0900aecd804fa16a .shtml.
CSCsh58082 SIP: A router may reload due to SIP trafficSymptom Cisco devices running an affected version of Internetwork Operating System (IOS) which supports Session Initiation Protocol (SIP) are affected by a vulnerability that may lead to a reload of the device when receiving a specific series of packets destined to port 5060.
This issue is compounded by a related bug which allows traffic to TCP 5060 and UDP port 5060 on devices not configured for SIP. There are no known instances of intentional exploitation of this issue. However,
Cisco has observed data streams that appear to be unintentionally triggering the vulnerability. Workarounds exist to mitigate the effects of this problem on devices which do not require SIP.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070131-sip.shtml.
CSCsi01470A vulnerability in the Cisco implementation of Multicast Virtual Private Network (MVPN) is subject to exploitation that can allow a malicious user to create extra multicast states on the core routers or receive multicast traffic from other Multiprotocol Label Switching (MPLS) based Virtual Private Networks (VPN) by sending specially crafted messages.
Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml.
CSCsg03449 Etherswitch module VLAN Trunking Protocol VulnerabilitiesSymptom
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Conditions
Further Information On the 13th September 2006, Phenoelit Group posted an advisory containing three vulnerabilities:
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These vulnerabilities are addressed by Cisco IDs:
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Cisco's statement and further information are available on the Cisco public website at
http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml
CSCsa53334 bus error in single_pkt_regexThe Intrusion Prevention System (IPS) feature set of Cisco IOS® contains several vulnerabilities. These include:
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There are mitigations and workarounds for these vulnerabilities. Cisco has made free software available to address these vulnerabilities for affected customers.
This advisory is posted at:
http://www.cisco.com/warp/public/707/cisco-sa-20070213-iosips.shtml
CSCef77013 tighter parameter checking for ipv6 CSCsi01470 iwijnand Crafted MDT Data Join TLV in VRF causes multicast state in coreCisco IOS and Cisco IOS XR contain a vulnerability when processing specially crafted IPv6 packets with a Type 0 Routing Header present. Exploitation of this vulnerability can lead to information leakage on affected IOS and IOS XR devices, and may also result in a crash of the affected IOS device. Successful exploitation on an affected device running Cisco IOS XR will not result in a crash of the device itself, but may result in a crash of the IPv6 subsystem.
Cisco has made free software available to address this vulnerability for affected customers. There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-IPv6-leak.shtml
CSCeh73049 tclsh mode bypasses aaa command authorization checkSymptom A vulnerability exists within the Cisco IOS Authentication, Authorization, and Accounting (AAA) command authorization feature, where command authorization checks are not performed on commands executed from the Tool Command Language (Tcl) exec shell. This may allow authenticated users to bypass command authorization checks in some configurations resulting in unauthorized privilege escalation.
Conditions
Workaround
http://www.cisco.com/warp/public/707/cisco-response-20060125-aaatcl.shtml
CSCek26492 ansjory Enhancements to Packet Input Path.Symptom A router may crash if it receives a packet with a specific crafted IP option as detailed in Cisco Security Advisory: Crafted IP Option Vulnerability:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
Conditions
Workaround
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
CSCsd85587 7200 Router crashes with ISAKMP Codenomicon test suiteA vulnerability has been discovered in a third party cryptographic library which is used by a number of Cisco products. This vulnerability may be triggered when a malformed Abstract Syntax Notation One (ASN.1) object is parsed. Due to the nature of the vulnerability it may be possible, in some cases, to trigger this vulnerability without a valid certificate or valid application-layer credentials (such as a valid username or password).
Successful repeated exploitation of any of these vulnerabilities may lead to a sustained Denial-of-Service (DoS); however, vulnerabilities are not known to compromise either the confidentiality or integrity of the data or the device. These vulnerabilities are not believed to allow an attacker will not be able to decrypt any previously encrypted information.
The vulnerable cryptographic library is used in the following Cisco products:
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This vulnerability is also being tracked by CERT/CC as VU#754281.
Cisco has made free software available to address this vulnerability for affected customers. There are no workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml .
Note
CSCsg70474 IOS FW with h323 inspect crashes when malformed H.323 packets receivedMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCsd81407 Router crash on receiving abnormal MGCP messages CSCse85200 padchand Inadequate validation of TLVs in cdpMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCsj44099 Router crashes if DSPFARM profile description is 128 characters long.Symptom A cisco c3800 router can experience a memory corruption resulting in a crash if the description field under the "dspfarm profile" configuration matches the maximum of 128 characters.
Conditions
Workaround
CSCdz55178 QoS profile name of more then 32 chars will crash the routerSymptom A router that is configured for QoS may reload unexpectedly or other serious symptoms such as memory corruption may occur.
Conditions
cable qos profile 12 name g711@10ms_for_any_softswitch_Traa^C00000000011111111111222222222333^12345678901234567890123456789012||PROBLEM(Variable Overflowed).Workaround
CSCsh46705 Remove unused func declaration of vtsp_tsp_call_disconnect_ind_rawsignalCSCsj66369 Traceback seen at rpmxf_dg_db_initSymptom Tracebacks seen while running metal_vpn_cases.itcl script
Conditions
Workaround
CSCsj52927 DATACORRUPTION-1-DATAINCONSISTENCY message in show log CSCsj66550 rclousto Strcpy off by one in appn/eis_command.c:1075Symptom DATACORRUPTION-1-DATAINCONSISTENCY messages are seen in 'show log'
Conditions
Workaround
CSCsj66513 Traceback detected at DNQueuePeers CSCsj72800 dwind Unbounded strcpy in alps/alps_chain.c:636 (conn_isp) CSCsh22430 richc c82x and c83x MMU mapping refinementSymptom Traceback found at DNQueuePeers
Conditions
Workaround
CSCsb11849 CoPP: Need support for malformed IP optionsSymptom CoPP policy configured to drop packets with IP options will ignore packets with malformed IP options
Conditions
Workaround
CSCek37177 malformed tcp packets deplete processor memory.The Cisco IOS Transmission Control Protocol (TCP) listener in certain versions of Cisco IOS software is vulnerable to a remotely-exploitable memory leak that may lead to a denial of service condition.
This vulnerability only applies to traffic destined to the Cisco IOS device.
Traffic transiting the Cisco IOS device will not trigger this vulnerability.
Cisco has made free software available to address this vulnerability for affected customers.
This issue is documented as Cisco bug ID CSCek37177
Workaround
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
CSCee41508 RSVP red zone crashSymptom An IOS device may crash when processing a malformed Resource ReSerVation Protocol (RSVP) packet.
Conditions
Workaround
If RSVP is not required, disabling RSVP on all interfaces removes any exposure to this issue.
RSVP can be disabled using the no ip rsvp bandwidth interface configuration command. The show ip rsvp EXEC command can be used on an IOS device to determine if RSVP functionality has been enabled. The show ip rsvp interface EXEC command may be used to identify the specific interfaces on which RSVP has been enabled.
CSCsb33172 short-circuit crypto engine operations when faking AM2A vulnerability exists in the way some Cisco products handle IKE phase I messages which allows an attacker to discover which group names are configured and valid on the device.
A Cisco Security Notice has been published on this issue and can be found at the following URL:
http://www.cisco.com/warp/public/707/cisco-sn-20050624-vpn-grpname.shtml
CSCsb12598 Router forced crash on receiving fragmented TLS ClientHelloCisco IOS device may crash while processing malformed Secure Sockets Layer (SSL) packets. In order to trigger these vulnerabilities, a malicious client must send malformed packets during the SSL protocol exchange with the vulnerable device. Successful repeated exploitation of any of these vulnerabilities may lead to a sustained Denial-of-Service (DoS); however, vulnerabilities are not known to compromise either the confidentiality or integrity of the data or the device.
These vulnerabilities are not believed to allow an attacker will not be able to decrypt any previously encrypted information. Cisco IOS is affected by the following vulnerabilities:
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Cisco has made free software available to address these vulnerabilities for affected customers. There are workarounds available to mitigate the effects of these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml
Note
CSCsd92405 router crashed by repeated SSL connection with malformed finished messagCisco IOS device may crash while processing malformed Secure Sockets Layer (SSL) packets. In order to trigger these vulnerabilities, a malicious client must send malformed packets during the SSL protocol exchange with the vulnerable device. Successful repeated exploitation of any of these vulnerabilities may lead to a sustained Denial-of-Service (DoS); however, vulnerabilities are not known to compromise either the confidentiality or integrity of the data or the device.
These vulnerabilities are not believed to allow an attacker will not be able to decrypt any previously encrypted information. Cisco IOS is affected by the following vulnerabilities:
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Cisco has made free software available to address these vulnerabilities for affected customers. There are workarounds available to mitigate the effects of these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml
Note
CSCsc72722 CBAC - firewall resets TCP idle timer upon receiving invalid TCP packetsSymptom TCP connections that are opened through a Cisco IOS Firewall (CBAC) may not timeout.
Conditions
Workaround
CSCse24889 Malformed SSH version 2 packets may cause processor memory depletionSymptom Malformed SSH version 2 packets may cause a memory leak, causing the platform to operate under a degraded condition. Under rare circumstances, the platform may reload to recover itself.
Conditions
Workaround
config tip ssh version 1endAlternate Workaround: Permit only known trusted hosts and/or networks to connect to the router by creating a vty access list, as in the following example:
10.1.1.0/24 is a trusted network thatis permitted access to the router, allother access is deniedaccess-list 99 permit 10.1.1.0 0.0.0.255access-list 99 deny anyline vty 0 4access-class 99 inendFurther Problem Description: For information about configuring vty access lists, see the Controlling Access to a Virtual Terminal Line document:
For information about SSH, see the Configuring Secure Shell on Routers and Switches Running Cisco IOS document:
http://www.cisco.com/warp/public/707/ssh.shtml
CSCsg40567 Memory leak found with malformed tls/ssl packets in http core processSymptom Malformed SSL packets may cause a router to leak multiple memory blocks.
Conditions
Workaround
CSCse05736 A router running RCP can be reloaded with a specific packetSymptom A router that is running RCP can be reloaded by a specific packet.
Conditions
Workaround
CSCsc64976 HTTP server should scrub embedded HTML tags from cmd outputA vulnerability exists in the IOS HTTP server in which HTML code inserted into dynamically generated output, such as the output from a show buffers command, will be passed to the browser requesting the page. This HTML code could be interpreted by the client browser and potentially execute malicious commands against the device or other possible cross-site scripting attacks. Successful exploitation of this vulnerability requires that a user browse a page containing dynamic content in which HTML commands have been injected.
Cisco will be making free software available to address this vulnerability for affected customers. There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20051201-http.shtml
CSCei62522 ISAKMP SA negotiation not successfull in aggressive mode with RADIUSSymptom ISAKMP SA negotiation is not successful in aggressive mode.
Conditions
Workaround
CSCed94829 IOS reloads due to malformed IKE messagesMultiple Cisco products contain vulnerabilities in the processing of IPSec IKE (Internet Key Exchange) messages. These vulnerabilities were identified by the University of Oulu Secure Programming Group (OUSPG) "PROTOS" Test Suite for IPSec and can be repeatedly exploited to produce a denial of service.
Cisco has made free software available to address this vulnerability for affected customers. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20051114-ipsec.shtml.
CSCsb40304 Router crash on sending repetitive SSL ChangeCipherSpecCisco IOS device may crash while processing malformed Secure Sockets Layer (SSL) packets. In order to trigger these vulnerabilities, a malicious client must send malformed packets during the SSL protocol exchange with the vulnerable device. Successful repeated exploitation of any of these vulnerabilities may lead to a sustained Denial-of-Service (DoS); however, vulnerabilities are not known to compromise either the confidentiality or integrity of the data or the device.
These vulnerabilities are not believed to allow an attacker will not be able to decrypt any previously encrypted information. Cisco IOS is affected by the following vulnerabilities:
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Cisco has made free software available to address these vulnerabilities for affected customers. There are workarounds available to mitigate the effects of these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml
Note
CSCse56501 two sockets(IP V4 and V6) bound to the same UDP port not working.A device running Cisco IOS software that has Internet Protocol version 6 (IPv6) enabled may be subject to a denial of service (DoS) attack. For the device to be affected by this vulnerability the device also has to have certain Internet Protocol version 4 (IPv4) User Datagram Protocol (UDP) services enabled. To exploit this vulnerability an offending IPv6 packet must be targeted to the device. Packets that are routed throughout the router can not trigger this vulnerability. Successful exploitation will prevent the interface from receiving any additional traffic. The only exception is Resource Reservation Protocol (RSVP) service, which if exploited, will cause the device to crash. Only the interface on which the vulnerability was exploited will be affected.
Cisco is providing fixed software to address this issue. There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml.
CSCsb11124 SGBP Crafted Packet Denial of ServiceThe Cisco IOS Stack Group Bidding Protocol (SGBP) feature in certain versions of Cisco IOS software is vulnerable to a remotely-exploitable denial of service condition. Devices that do not support or have not enabled the SGBP protocol are not affected by this vulnerability. Cisco has made free software available to address this vulnerability for affected customers.
There are workarounds available to mitigate the effects of the vulnerability. Cisco has published a Security Advisory on this issue; it is available at http://www.cisco.com/warp/public/707/cisco-sa-20060118-sgbp.shtml
CSCej20505 Router hangs with overly large packetMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCeg62070 Tracebacks noticed with Radius configs through HTTP PostSymptom Tracebacks or crash are seen during HTTP transactions with long URLs.
Conditions
Conditions
CSCin90682 unsolicited mode config request packet issueSymptom A Cisco IOS device configured for IKE/IPSec may reload.
Conditions
Workaround
CSCsi60004 H323 Proxy Unregistration from GatekeeperMultiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml.
CSCsd34855 VTP update with a VLAN name >100 characters causes buffer overflowSymptom The VTP feature in certain versions of Cisco IOS software is vulnerable to a locally-exploitable buffer overflow condition and potential execution of arbitrary code. If a VTP summary advertisement is received with a Type-Length-Value (TLV) containing a VLAN name greater than 100 characters, the receiving switch will reset with an Unassigned Exception error.
Conditions
Further Information On the 13th September 2006, Phenoelit Group posted an advisory containing three vulnerabilities:
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These vulnerabilities are addressed by Cisco IDs: CSCsd52629/"CSCsd34759
-- VTP version field DoS
-- Integer Wrap in VTP revision
-- Buffer Overflow in VTP VLAN name Cisco's statement and further information are available on the Cisco public website at http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml
CSCsd40334 IPv6 packet can cause crashProcessing a specially crafted IPv6 Type 0 Routing header can crash a device running Cisco IOS software. This vulnerability does not affect IPv6 Type 2 Routing header which is used in mobile IPv6. IPv6 is not enabled by default in Cisco IOS. Cisco has made free software available to address this vulnerability for affected customers. There are workarounds available to mitigate the effects of the vulnerability.
The workaround depends on if Mobile IPv6 is used and what version on Cisco IOS is being currently used.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml
Resolved Caveats - Release 12.3(7)XR6
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Cisco IOS may permit arbitrary code execution after exploitation of a heap-based buffer overflow vulnerability. Cisco has included additional integrity checks in its software, as further described below, that are intended to reduce the likelihood of arbitrary code execution.
Cisco has made free software available that includes the additional integrity checks for affected customers.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20051102-timers.shtml.
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Not able to telnet to card (No Free TTYs error).
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The Cisco IOS Firewall Authentication Proxy for FTP and/or Telnet Sessions feature in specific versions of Cisco IOS software is vulnerable to a remotely-exploitable buffer overflow condition.
Devices that do not support, or are not configured for Firewall Authentication Proxy for FTP and/or Telnet Services are not affected.
Devices configured with only Authentication Proxy for HTTP and/or HTTPS are not affected.
Only devices running certain versions of Cisco IOS are affected.
Cisco has made free software available to address this vulnerability. There are workarounds available to mitigate the effects of the vulnerability.
This advisory will be posted at http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml
Resolved Caveats - Release 12.3(7)XR5
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Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features:
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Cisco has made free software available to address these vulnerabilities for affected customers. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
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Remote Authentication Dial In User Service (RADIUS) authentication on a device that is running certain versions of Cisco Internetworking Operating System (IOS) and configured with a fallback method of none can be bypassed.
Systems that are configured for other authentication methods or that are not configured with a fallback method of none are not affected.
Only the systems that are running certain versions of Cisco IOS are affected. Not all configurations using RADIUS and a fallback method of none are vulnerable to this issue. Some configurations using RADIUS, fallback method none, and an additional method are not affected.
Cisco has made free software available to address this vulnerability.
More details can be found in the security advisory which posted at the following URL http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml
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Symptoms: A router may reset its Border Gateway Protocol (BGP) session.
Conditions: This symptom is observed when a Cisco router that peers with other routers receives an Autonomous System (AS) path with a length that is equal to or greater than 255.
Workaround: Configure the bgp maxas limit command in such as way that the maximum length of the AS path is a value below 255. When the router receives an update with an excessive AS path value, the prefix is rejected and the event is recorded in the log.
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Problem: memory not being freed correctly for ezvpn_process.
Symptom: "sh processes memory <pid of ezvpn client process>" will display the memory not being freed for the ezvpn client process. Ezvpn works fine.
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A Cisco IOS router acting as an EzVPN server that terminates vpn client sessions may experience a memory leak in the processor memory pool. This can be identified by an increasing amount of memory held by the Crypto IKMP process in the show process memory output.
Resolved Caveats - Cisco IOS Release 12.3(7)XR4
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The system may be protected by installing appropriate access lists to filter all IPv6 fragments destined for the system. For example:
interface Ethernet0/0ipv6 traffic-filter nofragments in!ipv6 access-list nofragmentsdeny ipv6 any <my address1> undetermined-transportdeny ipv6 any <my address2> fragmentspermit ipv6 any anyThis must be applied across all interfaces, and must be applied to all IPv6 addresses which the system recognizes as its own.
This will effectively disable reassembly of all IPv6 fragments. Some networks may rely on IPv6 fragmentation, so careful consideration should be given before applying this workaround.
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Workaround: Administratively shut down both the Ethernet0 and Ethernet2 interfaces and then administratively bring up both these interfaces one after the other.
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Ethernet interface does not send ping replies after reload.
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IPSEC real time DNS : unable to resolve peer hostname.
With the IPSEC realtime DNS feature, when resolving the hostname, the router tries to do a ISAKMP SA negotiation and both fail (negotiation and name resolving).
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CBAC FTP-data sessions remain in SIS_CLOSING state.
Workaround: Lowering the inspect FTP timeout and disabling CEF will reduce exposure. Bump certain out-of-order packets to process path for catch-up and then drop packets if unsuccessful.
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CBAC inspection causes software-forced reload.
When the Cisco IOS Firewall CBAC is configured, the router may have a software-forced reload caused by one of the inspections processed. This symptom is observed when the router is part of a DMVPN hub-spoke with a Cisco VoIP phone solution deployed on it, and the router is connected to the central office over the Internet. The Cisco VoIP phone runs the SKINNY protocol.
Workaround: None.
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BGP error msg trackback.
A device running Cisco IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a DoS attack from a malformed BGP packet. Only devices with the command bgp log-neighbor-changes configured are vulnerable. The BGP protocol is not enabled by default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject a malformed packet.
Cisco has made free software available to address this problem. Please see the advisory available at http://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml.
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Crash occurs while scaling L2TPv3 Xconnect commands on subinterfaces.
When L2TPv3 tunnels are scaled and the IP Path MTU Discovery feature is enabled, a memory leak and crash may occur. This symptom is observed when multiple Xconnect statements are applied in conjunction with the IP Path MTU Discovery feature in the pseudowire class.
Workaround: Do not enable the IP Path MTU Discovery feature in an L2TPv3 configuration.
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Crash when L2TPv3 manual session delete.
A router crashes when you delete a manual static Xconnect service with L2TPv3 encapsulation.
Workaround: Do not delete a manual static Xconnect service with L2TPv3 encapsulation.
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L2TPv3 and UTI sessions doing PMTUD vulnerable to spoofed ICMP paks.
A document that describes how the Internet Control Message Protocol (ICMP) could be used to perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol (TCP) has been made publicly available. This document has been published through the Internet Engineering Task Force (IETF) Internet Draft process, and is entitled "ICMP Attacks Against TCP" (draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device itself, can be of three types:
1. Attacks that use ICMP "hard" error messages
2. Attacks that use ICMP "fragmentation needed and Don't Fragment (DF) bit set" messages, also known as Path Maximum Transmission Unit Discovery (PMTUD) attacks
3. Attacks that use ICMP "source quench" messagesSuccessful attacks may cause connection resets or reduction of throughput in existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml.
The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected. Its posting can be found at: http://www.niscc.gov.uk/niscc/docs/re-20050412-00303.pdf?lang=en.
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IPSec (ESP-AH) doing PMTUD vulnerable to spoofed ICMP packets.
See note for CSCef43691, above.
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More stringent checks required for ICMP unreachables.
See note for CSCef43691, above.
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IPSec PMTUD not working [after CSCef44225].
See note for CSCef43691, above.
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GRE and IPinIP doing PMTUD vulnerable to spoofed ICMP packets.
See note for CSCef43691, above.
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Incorrect handling of ICMPv6 messages can cause TCP performance problems.
See note for CSCef43691, above.
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L2TP doing PMTUD vulnerable to spoofed ICMP paks.
See note for CSCef43691, above.
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Enhancements to L2TPv3 PMTUD may not work [Follow-up to CSCef43691]
See note for CSCef43691, above.
Resolved Caveats - Cisco IOS Release 12.3(7)XR3
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A document that describes how the Internet Control Message Protocol (ICMP) could be used to perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol (TCP) has been made publicly available. This document has been published through the Internet Engineering Task Force (IETF) Internet Draft process, and is entitled "ICMP Attacks Against TCP" (draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device itself, can be of three types:
1. Attacks that use ICMP "hard" error messages
2. Attacks that use ICMP "fragmentation needed and Don't Fragment (DF) bit set" messages, also known as Path Maximum Transmission Unit Discovery (PMTUD) attacks
3. Attacks that use ICMP "source quench" messagesSuccessful attacks may cause connection resets or reduction of throughput in existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml.
The disclosure of these vulnerabilities is being coordinated by the National Infrastructure Security Coordination Centre (NISCC), based in the United Kingdom. NISCC is working with multiple vendors whose products are potentially affected. Its posting can be found at: http://www.niscc.gov.uk/niscc/docs/re-20050412-00303.pdf?lang=en.
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Unable to telnet.
A specifically crafted Transmission Control Protocol (TCP) connection to a telnet or reverse telnet port of a Cisco device running Internetwork Operating System (IOS) may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell (SSH), and in some cases Hypertext Transport Protocol (HTTP) access to the Cisco device. Telnet, reverse telnet, RSH and SSH sessions established prior to exploitation are not affected.
All other device services will operate normally. Services such as packet forwarding, routing protocols and all other communication to and through the device are not affected.
Cisco will make free software available to address this vulnerability. Workarounds, identified below, are available that protect against this vulnerability.
The Advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml
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Add Survivable Remote Site Telephony (SRST) call pickup based on called number match.
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Interactive CLI: show run command not returning the full configuration.
Commands initiated via the cns exec command-line interface (CLI) command do not run at the correct privilege level. This results on some commands not being permitted.
Workaround: None.
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Cosmetic Display CLI Related Issues.
While giving line-mode 2-wire ? command in ATM mode on WIC-1SHDSL-V2, the help text displays incorrect mapping between the line number and the pins used.
Workaround: None.
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WRED-COUNT: Wrong instance value created for [rate-limit] command.
Weighted random early detection (WRED) counter fails.
Workaround: None.
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Shutting down the backup CCM causes major calls drop.
When the second backup Cisco CallManager (CCM) is down during active load testing, none of the active calls can be sustained.
Workaround: None.
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Bus error in crypto ip_vrf_pak_subblock_copy.
A router running IP Security (IPSec) may reload due to a bus error.
Workaround: Enter no ip-virtual reassembly command on the router.
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8172A590 chunkmagic 0 chunk_freemagic 1000000 tracebacks.
A Cisco router that is configured as a spoke in a hub-spoke network shows tracebacks.
Workaround: None.
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Router crashes when show controller ethernet CLI is executed.
A Cisco 1700 series router crashes when show controller ethernet command is entered.
Workaround: None.
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SNMP-server trap source loopback0 traps sourced from the wrong interface.
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Sometimes EZVPN does not accept XAuth request from server.
Easy Virtual Private Network (EZVPN) may not prompt for extended authentication (XAuth) credentials on console.
Workaround: Enter the clear crypto ipsec client ezvpn command and reconnect if it is in manual mode.
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Cisco Internetwork Operating System (IOS) Software release trains 12.2T, 12.3 and 12.3T may contain vulnerabilities in processing certain Internet Key Exchange (IKE) Xauth messages when configured to be an Easy VPN Server.
Successful exploitation of these vulnerabilities may permit an unauthorized user to complete authentication and potentially access network resources.
This advisory will be posted to http://www.cisco.com/warp/public/707/cisco-sa-20050406-xauth.shtml
Caveats - Cisco IOS Release 12.3(7)XR2
There are no caveats specific to Cisco IOS Release 12.3(7)XR2 that require documentation in the release notes.
Caveats - Cisco IOS Release 12.3(7)XR1
There are no caveats specific to Cisco IOS Release 12.3(7)XR1 that require documentation in the release notes.
Caveats - Cisco IOS Release 12.3(7)XR
There are no caveats specific to Cisco IOS Release 12.3(7)XR that require documentation in the release notes.
Related Documentation
The following sections describe the documentation available for the Cisco 1700 series routers. These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on Cisco.com and http://www.cisco.com/univercd/home/index.htm.
Use these release notes with these documents:
Release-Specific Documents
The following documents are specific to Cisco IOS Release 12.3 and are located on Cisco.com and http://www.cisco.com/univercd/home/index.htm:
•
On Cisco.com at:
Products and Solutions: Cisco IOS Software: Cisco IOS Software Releases 12.3: Instructions and Guides: Release Notes
On http://www.cisco.com/univercd/home/index.htm at:
Cisco IOS Software: Cisco IOS Release 12.3: Release Notes: Cross-Platform Release Notes
Note
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http://www.cisco.com/univercd/home/index.htm
•
As a supplement to the caveats listed in these release notes, see Caveats for Cisco IOS Release 12.3 and Caveats for Cisco IOS Release 12.3T, which contain caveats applicable to all platforms for all maintenance releases of Cisco IOS Release 12.3 and Cisco IOS Release 12.3T.
On Cisco.com at:
Products & Services: IOS Software: Cisco IOS Software Releases 12.3: Instructions and Guides: Release Notes: Release Notes for Cisco IOS Release 12.3, Part 5: Caveats
On http://www.cisco.com/univercd/home/index.htm at:
Cisco IOS Software: Cisco IOS Release 12.3: Release Notes: Caveats
•
Platform-Specific Documents
These documents are available for the Cisco 800 series routers:
On Cisco.com at:
Technical Documentation: Routers: Fixed Config. Access Routers: <platform_name>
On http://www.cisco.com/univercd/home/index.htm at:
Product Documentation: Routers: Fixed Config. Access Routers: <platform_name>
These documents are available for the Cisco 1700 series routers:
On Cisco.com at:
Products and Solutions: Routers: Cisco 1700 Series Modular Access Routers
On http://www.cisco.com/univercd/home/index.htm at:
Product Documentation: Routers: Modular Access Routers: Cisco 1700 Series Routers
Cisco Feature Navigator
Cisco IOS software is packaged in feature sets that are supported on specific platforms. To obtain updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
http://tools.cisco.com/RPF/register/register.do
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents.
Documentation Modules
Each module in the Cisco IOS documentation set consists of one or more configuration guides and one or more corresponding command references. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On Cisco.com at:
Products and Solutions: Cisco IOS Software: Cisco IOS Releases 12.3: Instructions and Guides
On http://www.cisco.com/univercd/home/index.htm at:
Cisco IOS Software: Cisco IOS Release 12.3: Configuration Guides and Command References
Cisco IOS Release 12.3 Documentation Set Contents
Table 7 lists the contents of the Cisco IOS Release 12.3 software documentation set, which is available in electronic form and in printed form if ordered.
On Cisco.com at:
Products and Solutions: Cisco IOS Software: Cisco IOS Releases 12.3: Instructions and Guides
On http://www.cisco.com/univercd/home/index.htm at:
Cisco IOS Software: Cisco IOS Release 12.3
Obtaining Documentation, Obtaining Support, and Security Guidelines
For information on obtaining documentation, obtaining support, providing documentation feed-back, security guidelines, and also recommended aliases and general Cisco documents, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Use this document in conjunction with the documents listed in the "Related Documentation" section.
CCVP, the Cisco logo, and the Cisco Square Bridge logo are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn is a service mark of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, Follow Me Browsing, FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, iPhone, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, iQuick Study, LightStream, Linksys, MeetingPlace, MGX, Networking Academy, Network Registrar, Packet, PIX, ProConnect, ScriptShare, SMARTnet, StackWise, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.
All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0705R)
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
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