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Cisco Security Advisory: Cisco IOS Software Multiple Features IP Sockets Vulnerability

Document ID: 109333

Advisory ID: cisco-sa-20090325-ip

http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml

Revision 1.4

Last Updated 2009 June 25 2200 UTC (GMT)

For Public Release 2009 March 25 1600 UTC (GMT)

Please provide your feedback on this document.

Contents

Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of this Notice: FINAL
Distribution
Revision History
Cisco Security Procedures

Summary

A vulnerability in the handling of IP sockets can cause devices to be vulnerable to a denial of service attack when any of several features of Cisco IOS® Software are enabled. A sequence of specially crafted TCP/IP packets could cause any of the following results:

Cisco has released free software updates that address this vulnerability.

Several mitigation strategies are outlined in the "Workarounds" section of this advisory.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml.

Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. All of the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory.

Individual publication links are listed below:

Affected Products

Vulnerable Products

Devices that are running affected versions of Cisco IOS Software and Cisco IOS XE Software are affected if they are running any of the following features. Details about confirming whether the affected feature is enabled on a device are in the "Details" section of this advisory.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the "show version" command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the "show version" command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih

<output truncated>

The following example shows a product that is running Cisco IOS Software Release 12.4(20)T with an image name of C1841-ADVENTERPRISEK9-M:

Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 20:25 by prod_rel_team

<output truncated>

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html.

Products Confirmed Not Vulnerable

The following products are not affected by this vulnerability:

No other Cisco products or features configured in Cisco IOS or Cisco IOS XE Software are currently known to be affected by this vulnerability.

Details

For successful exploitation of this vulnerability, the TCP three-way handshake must be completed to the associated TCP port number(s) for any of the features described in this section.

Cisco Unified Communications Manager Express

The following configurations are vulnerable for different Cisco Unified Communications Manager Express services:

A certificate authority proxy function (CAPF) server has been configured.

The following example shows a vulnerable CAPF server configuration:

capf-server
 auth-mode null-string
 cert-enroll-trustpoint root password 1 104D000A061843595F
 trustpoint-label cme_cert
 source-addr 10.0.0.1

The default TCP port used for CAPF server is 3804.

Further information about CAPF-server is in the Cisco Unified Communications Manager Express System Administrator Guide at http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeauth.html#wp1085744.

Telephony-service security parameters have been configured.

If the telephony-service security parameters have been configured with "device-security-mode", the device is vulnerable. The following example shows three vulnerable configurations for telephony-service security parameters:

ephone 1
 device-security-mode encrypted

ephone 2
 device-security-mode authenticated

ephone 3
 device-security-mode none

The TCP port used is defined with the "ip source-address <address> port <port-number>" telephony-service configuration command.

Further information about Telephony-service security parameters is in the Cisco Unified Communications Manager Express System Administrator Guide at http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeauth.html#wp1080079.

The global telephony-service or call-manager-fallback command has been configured.

Any Cisco IOS configuration with the global "telephony-service" or "call-manager-fallback" command is vulnerable if any subcommands are in the telephony-service or call-manager-fallback configuration mode. The following examples show vulnerable configurations:

telephony-service
 ip source-address 192.168.0.1 port 2011

or

call-manager-fallback
 ip source-address 192.168.0.1 port 2011

The TCP port used is defined with the "ip source-address <address> port <port-number>" configuration command.

Further information about telephony service and call-manager-fallback is in the Cisco Unified Communications Manager Express System Administrator Guide at http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesystm.html.

SIP Gateway Signaling Support over TLS Transport

Note: For customers with devices enabled with SIP, also consult the document "Cisco Security Advisory: Cisco IOS Session Initiation Protocol Denial of Service Vulnerability" at the following link http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.html.

Devices that are configured for SIP gateway signaling support over TLS transport are vulnerable. The following examples show vulnerable configurations:

voice service voip 
 sip
  session transport tcp tls
  url sips

-- or --

dial-peer voice 3456 voip
 voice-class sip url sips
 session protocol sipv2
 session transport tcp tls

For the SIP gateway signaling support over TLS transport to function correctly, administrators must first configure a trustpoint using the following configuration:

sip-ua
     crypto signaling default trustpoint example_trustpoint_name

The default TCP port used for the SIP gateway signaling support over TLS transport feature is 5061.

Further information about Cisco IOS SIP gateway signaling support over TLS transport is in the Cisco IOS Software Release 12.4T feature guide at http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/FeatTLS.html.

Secure Signaling and Media Encryption

A device is vulnerable if it is configured with the Media and Signaling Encryption (SRTP/TLS) on DSP Farm Conferencing feature or with Secure Signaling and Media Encryption for analog phones with Skinny Call Control Protocol (SCCP).

The following examples show three different vulnerable secure DSP farm configurations. Several other parts are required for a full configuration, such as certificates and SCCP configuration, but these parts have been excluded for brevity.

dspfarm profile 2 transcode security
 trustpoint 2851ClientMina
 codec g711ulaw
 codec g711alaw
 codec g729ar8
 codec g729abr8
 codec gsmfr
 codec g729r8
 codec g729br8
 maximum sessions 3
 associate application SCCP
dspfarm profile 3 conference security
 trustpoint sec2800-cfb
 codec g711ulaw
 codec g711alaw
 codec g729ar8
 codec g729abr8
 codec g729r8
 codec g729br8
 maximum sessions 2
 associate application SCCP
dspfarm profile 5 mtp security
 trustpoint 2851ClientMina
 codec g711alaw
 maximum sessions hardware 1
 associate application SCCP

The default TCP port used for the Media and Signaling Encryption on DSP Farm Conferencing feature is 2443.

Further information about the Media and Signaling Encryption on DSP Farm Conferencing feature is in the "Cisco IOS Software Release 12.4 Special and Early Deployments feature guide" at the following link http://www.cisco.com/en/US/docs/ios/12_4t/12_4t15/itsdsp.html.

The following output shows the relevant section of Secure Signaling and Media Encryption for analog phones and is a vulnerable configuration (Several other parts are required for a full configuration, such as certificates, SCCP configuration, and dial peers):


!--- The following lines show SCCP Telephony Control Application 
!--- (STCAPP) security enabled at the system level:

stcapp ccm-group 1
stcapp security trustpoint analog
stcapp security mode encrypted
stcapp 

<-- output removed for brevity -->

dial-peer voice 5002 pots
service stcapp

!--- The following line shows the security mode configured on the 
!--- dial peer.

security mode authenticated
port 2/1

The default TCP port used for Media and Signaling Encryption for analog phones is 2443.

Further information about Media and Signaling Encryption for analog phones is in the "Supplementary Services Features for FXS Ports on Cisco IOS Voice Gateways Configuration Guide, Release 12.4T" at the following link http://www.cisco.com/en/US/docs/ios/voice/fxs/configuration/guide/fsxsecur.html.

Blocks Extensible Exchange Protocol

Any configuration or executable command that leverages Blocks Extensible Exchange Protocol (BEEP) as a transport protocol is vulnerable. The following example shows the vulnerable configuration of the feature NETCONF over BEEP. NETCONF over BEEP using SASL is also vulnerable.

crypto key generate rsa general-keys 
crypto pki trustpoint my_trustpoint 
enrollment url http://10.2.3.3:80
subject-name CN=dns_name_of_host.com
revocation-check none 
 
crypto pki authenticate my_trustpoint 
crypto pki enroll my_trustpoint 

line vty 0 15 
netconf lock-time 60 
netconf max-sessions 16 

netconf beep initiator host1 23 user my_user password 
   my_password encrypt my_trustpoint 
reconnect-time 60 

netconf beep listener 23 sasl user1 encrypt my_trustpoint

The TCP port used is defined with the "netconf beep initiator" and "netconf beep listener" configuration commands.

Further information about NETCONF over BEEP is in the "Cisco IOS Software Release 12.4T feature guide" at the following link http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htnetbe.html#wp1049404.

The BEEP executable commands "bingd" and "bingng" could cause this vulnerability to be triggered when they are invoked. The following shows an example of these commands being executed:

bingng device 192.168.0.1 23
bingd device 23

Network Admission Control HTTP Authentication Proxy

Devices configured with Network Admission Control HTTP Authentication Proxy are vulnerable. For the device to be vulnerable the authentication proxy rule must exist and be applied to an interface.

The following configuration creates an authentication proxy rule.

ip admission name example-ap-rule-name proxy http

The following configuration attaches the authentication proxy rule (created in the previous example) to an interface.

interface GigabitEthernet 0/0
 ip admission example-ap-rule-name

The default TCP port used for Network Admission Control HTTP Authentication Proxy is 80.

Further information about Network Admission Control HTTP Authentication Proxy is in the "Cisco IOS Security Configuration Guide, Release 12.4" at the following link http://www.cisco.com/en/US/docs/ios/security/configuration/guide/sec_net_admssn_ctrl_external_docbase_0900e4b1805b0530_4container_external_docbase_0900e4b1807b01dc.html#wp1053991.

Per-user URL Redirect for EAPoUDP, Dot1x, and MAC Authentication Bypass

Devices that have URL redirect feature configured are vulnerable. URL redirect is supported for EAP over UDP (EAPoUDP), Dot1x and MAC Authentication Bypass (MAB) authentication mechanisms. The URL redirect configuration can either be on the server or set up as part of a locally defined profile or policy. Both configurations are vulnerable. A device is vulnerable with either of the following configurations.

URL Redirect Feature Enabled for EAPoUDP

The URL redirect feature is enabled for EAPoUDP with the following global configuration command:

ip admission name <EAPoUDP-rule-name> eapoudp

The following configuration attaches the EAPoUDP rule (created in the previous example) to an interface.

ip admission name <EAPoUDP-rule-name>

URL Redirect Feature Enabled for Dot1x and MAB

The URL redirect feature for both Dot1x and MAB are vulnerable and will have a URL redirect AV pair on the RADIUS server defined in a method that is similar to the following: 

url-redirect="http://example.com"
url-redirect="urlacl"

For the Dot1x and MAB URL redirect feature to work successfully on the switch, the minimum following configuration would also be required. There is no interface-specific configuration for URL redirect. Basically the interface has to be configured for Dot1x/MAB.

ip http {server | secure-server}
ip device tracking

The default TCP port used for per-user URL redirect for EAPoUDP, Dot1x, and MAB is 80 and 443.

Further information about per-user URL redirect for EAPoUDP, Dot1x, and MAB is in the "Catalyst 4500 Series Switch Software Configuration Guide, 12.2(50)SG" at the following link http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/50sg/configuration/guide/dot1x.html#wp1311079.

Distributed Director with HTTP Redirects

A device is vulnerable if Distributed Director is configured with HTTP redirects. The following example shows a vulnerable configuration:

ip director ip-address 192.168.0.1

The default TCP port used for distributed director with HTTP redirect is 53.

Further information about Distributed Director with HTTP redirects is in "Distributed Director Configuration Example Overview" at the following link http://www.cisco.com/en/US/products/hw/contnetw/ps813/products_tech_note09186a00801fa9dd.shtml#topic8b.

DNS

Devices that are configured with the Cisco IOS DNS feature are vulnerable. A pure DNS over UDP implementation is not vulnerable. See the "Workarounds" section of this advisory for information about filtering DNS over TCP traffic to the device. If any of the commands in the following example appear in the device configuration, the device is vulnerable:

ip dns server
ip dns primary example.com soa www.example.com admin@example.com
ip dns spoofing 192.168.0.1

The default TCP port used for DNS is 53.

Further information about Cisco IOS DNS is in the "Cisco IOS IP Addressing Services Configuration Guide, Release 12.4" at the following link http://www.cisco.com/en/US/docs/ios/ipaddr/configuration/guide/iad_config_dns_ps6350_TSD_Products_Configuration_Guide_Chapter.html.

This vulnerability is documented in the following Cisco Bug ID: CSCsm27071 ( registered customers only) and has been assigned the Common Vulnerabilities and Exposures (CVE) identifiers CVE-2009-0630.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss .

CSCsm27071: Cisco IOS Software Multiple Features IP Sockets Vulnerability

Calculate the environmental score of CSCsm27071

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerability may result in the any of the following occurring:

Repeated attempts to exploit this vulnerability could result in a sustained DoS condition.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

Major Release

Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release

Recommended Release

12.0

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0DA

Vulnerable; first fixed in 12.2DA

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0DB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0DC

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0S

12.0(32)S12

12.0(32)S12

12.0SC

Vulnerable; first fixed in 12.0S

12.0(32)S12

12.0SL

Vulnerable; first fixed in 12.0S

12.0(32)S12

12.0SP

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0ST

Vulnerable; first fixed in 12.0S

12.0(32)S12

12.0SX

Vulnerable; first fixed in 12.0S

12.0(32)S12

12.0SY

12.0(32)SY8

12.0(32)SY8

12.0SZ

Vulnerable; first fixed in 12.0S

12.0(32)S12

12.0T

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0W

Vulnerable; contact TAC

  

12.0WC

Vulnerable; contact TAC

  

12.0WT

Not Vulnerable

  

12.0XA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XC

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XD

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XE

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XF

Not Vulnerable

  

12.0XG

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XH

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XI

Releases prior to 12.0(4)XI2 are vulnerable, release 12.0(4)XI2 and later are not vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XJ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XK

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XL

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XM

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XN

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XQ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XR

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XS

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XT

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.0XV

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

Affected 12.1-Based Releases

First Fixed Release

Recommended Release

12.1

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1AA

Vulnerable; contact TAC

  

12.1AX

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.1AY

Vulnerable; first fixed in 12.1EA

12.1(22)EA13

12.2(44)SE6

12.1AZ

Vulnerable; first fixed in 12.1EA

12.1(22)EA13

12.2(44)SE6

12.1CX

Vulnerable; contact TAC

  

12.1DA

Vulnerable; first fixed in 12.2DA

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1DB

Vulnerable; contact TAC

  

12.1DC

Vulnerable; contact TAC

  

12.1E

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.1EA

12.1(22)EA13

12.1(22)EA13

12.1EB

Vulnerable; contact TAC

  

12.1EC

Vulnerable; first fixed in 12.3BC

12.2(33)SCB1

12.3(23)BC6

12.1EO

Vulnerable; contact TAC

  

12.1EU

Vulnerable; first fixed in 12.2SG

12.2(31)SGA9

12.1EV

Vulnerable; contact TAC

  

12.1EW

Vulnerable; migrate to 12.2SGA

  

12.1EX

Vulnerable; contact TAC

  

12.1EY

Vulnerable; contact TAC

  

12.1EZ

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.1GA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1GB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1T

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XC

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XD

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XE

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XF

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XG

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XH

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XI

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XJ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XL

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XM

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XP

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XQ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XR

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XS

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XT

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XU

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XV

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XW

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XX

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XY

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1XZ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YC

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YD

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YE

Releases prior to 12.1(5)YE6 are vulnerable, release 12.1(5)YE6 and later are not vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YF

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YH

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.1YI

Vulnerable; contact TAC

  

12.1YJ

Vulnerable; first fixed in 12.1EA

12.1(22)EA13

12.2(44)SE6

Affected 12.2-Based Releases

First Fixed Release

Recommended Release

12.2

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2B

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2BC

Vulnerable; migrate to 12.2SCB1 or 12.3BC

12.2(33)SCB1

12.3(23)BC6

12.2BW

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2BX

Vulnerable; migrate to 12.2SB4

12.2(33)SB4

12.2BY

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2BZ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2CX

Vulnerable; migrate to 12.2SCB or 12.3BC

12.2(33)SCB1

12.3(23)BC6

12.2CY

Vulnerable; migrate to 12.2SCB or 12.3BC

12.2(33)SCB1

12.3(23)BC6

12.2CZ

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2DA

12.2(12)DA14; Available on 30-JUL-2009

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2DD

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2DX

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2EW

Vulnerable; first fixed in 12.2SG

12.2(31)SGA9

12.2EWA

Vulnerable; first fixed in 12.2SG

12.2(31)SGA9

12.2EX

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2EY

12.2(44)EY

12.2(44)SE6

12.2EZ

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2FX

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2FY

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2FZ

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2IRA

Vulnerable; first fixed in 12.2SRC

12.2(33)SRC4; Available on 18-MAY-2009

12.2IRB

Vulnerable; first fixed in 12.2SRC

12.2(33)SRC4; Available on 18-MAY-2009

12.2IXA

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXB

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXC

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXD

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXE

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXF

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2IXG

Vulnerable; migrate to any release in 12.2IXH

12.2(18)IXH; Available on 31-MAR-2009

12.2JA

Not Vulnerable

  

12.2JK

Not Vulnerable

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2MB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2MC

12.2(15)MC2m

12.2(15)MC2m

12.2S

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2SB

12.2(31)SB14

12.2(33)SB1

12.2(28)SB13

12.2(33)SB4

12.2SBC

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2SCA

12.2(33)SCA2

12.2(33)SCB1

12.2SCB

Not Vulnerable

  

12.2SE

12.2(50)SE

12.2(46)SE2

12.2(44)SE5

12.2(44)SE6

12.2SEA

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SEB

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SEC

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SED

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SEE

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SEF

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SEG

Vulnerable; first fixed in 12.2SE

12.2(44)SE6

12.2SG

12.2(50)SG

12.2(52)SG; Available on 15-MAY-2009

12.2SGA

12.2(31)SGA9

12.2(31)SGA9

12.2SL

Not Vulnerable

  

12.2SM

Vulnerable; contact TAC

  

12.2SO

Vulnerable; contact TAC

  

12.2SQ

Not Vulnerable

  

12.2SRA

Vulnerable; first fixed in 12.2SRC

12.2(33)SRC4; Available on 18-MAY-2009

12.2SRB

Vulnerable; first fixed in 12.2SRC

12.2(33)SRB5a; Available on 3-April-2009

12.2(33)SRC4; Available on 18-MAY-2009

12.2SRC

12.2(33)SRC1

12.2(33)SRC4; Available on 18-MAY-2009

12.2SRD

Not Vulnerable

  

12.2STE

Vulnerable; contact TAC

  

12.2SU

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2SV

Vulnerable; contact TAC

  

12.2SVA

Vulnerable; contact TAC

  

12.2SVC

Vulnerable; contact TAC

  

12.2SVD

Vulnerable; contact TAC

  

12.2SVE

Vulnerable; contact TAC

  

12.2SW

Vulnerable; contact TAC

  

12.2SX

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2SXA

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2SXB

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2SXD

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2SXE

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2SXF

12.2(18)SXF16

12.2(18)SXF16

12.2SXH

12.2(33)SXH5; Available on 20-APR-2009

12.2(33)SXH5; Available on 20-APR-2009

12.2SXI

Not Vulnerable

  

12.2SY

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2SZ

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2T

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2TPC

Vulnerable; contact TAC

  

12.2XA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XB

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XC

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XD

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XE

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XF

Vulnerable; migrate to 12.2SCB or 12.3BC

12.2(33)SCB1

12.3(23)BC6

12.2XG

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XH

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XI

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XJ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XK

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XL

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XM

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XN

Vulnerable; first fixed in 12.2SRC

12.2(33)SB4

12.2(33)SRD1

12.2XNA

Vulnerable; migrate to any release in 12.2SRD

12.2(33)SRD1

12.2XNB

Not Vulnerable

  

12.2XNC

Not Vulnerable

  

12.2XO

12.2(46)XO

12.2(46)XO

12.2XQ

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XR

Not Vulnerable

  

12.2XS

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XT

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XU

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XV

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2XW

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2YA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2YB

Vulnerable; contact TAC

  

12.2YC

Vulnerable; contact TAC

  

12.2YD

Vulnerable; contact TAC

  

12.2YE

Vulnerable; contact TAC

  

12.2YF

Vulnerable; contact TAC

  

12.2YG

Vulnerable; contact TAC

  

12.2YH

Vulnerable; contact TAC

  

12.2YJ

Vulnerable; contact TAC

  

12.2YK

Vulnerable; contact TAC

  

12.2YL

Vulnerable; contact TAC

  

12.2YM

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2YN

Vulnerable; contact TAC

  

12.2YO

Vulnerable; contact TAC

  

12.2YP

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2YQ

Vulnerable; contact TAC

  

12.2YR

Vulnerable; contact TAC

  

12.2YS

Not Vulnerable

  

12.2YT

Vulnerable; contact TAC

  

12.2YU

Vulnerable; contact TAC

  

12.2YV

Vulnerable; contact TAC

  

12.2YW

Vulnerable; contact TAC

  

12.2YX

Vulnerable; contact TAC

  

12.2YY

Vulnerable; contact TAC

  

12.2YZ

Vulnerable; contact TAC

  

12.2ZA

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF16

12.2ZB

Vulnerable; contact TAC

  

12.2ZC

Vulnerable; contact TAC

  

12.2ZD

Vulnerable; contact TAC

  

12.2ZE

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2ZF

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2ZG

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.2ZH

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.2ZJ

Vulnerable; contact TAC

  

12.2ZL

Vulnerable; contact TAC

  

12.2ZP

Vulnerable; contact TAC

  

12.2ZU

Vulnerable; first fixed in 12.2SXH

12.2(33)SXH5; Available on 20-APR-2009

12.2ZX

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.2ZY

Vulnerable; contact TAC

  

12.2ZYA

12.2(18)ZYA1

12.2(18)ZYA1

Affected 12.3-Based Releases

First Fixed Release

Recommended Release

12.3

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.3B

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3BC

12.3(23)BC6

12.3(23)BC6

12.3BW

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3EU

Not Vulnerable

  

12.3JA

Not Vulnerable

  

12.3JEA

Not Vulnerable

  

12.3JEB

Not Vulnerable

  

12.3JEC

Not Vulnerable

  

12.3JK

Not Vulnerable

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3JL

Vulnerable; first fixed in 12.4JK

 

12.3JX

Not Vulnerable

  

12.3T

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3TPC

Vulnerable; contact TAC

  

12.3VA

Vulnerable; contact TAC

  

12.3XA

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.3XB

Vulnerable; contact TAC

  

12.3XC

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XD

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XE

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.3XF

Vulnerable; contact TAC

  

12.3XG

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XI

Vulnerable; first fixed in 12.2SB

12.2(33)SB4

12.3XJ

Vulnerable; first fixed in 12.3YX

12.3(14)YX14

12.3XK

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XL

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XQ

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XR

Vulnerable; first fixed in 12.4

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.3XS

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XU

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XW

Vulnerable; first fixed in 12.3YX

12.3(14)YX14

12.3XX

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XY

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3XZ

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YA

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YD

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YF

Vulnerable; first fixed in 12.3YX

12.3(14)YX14

12.3YG

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YH

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YI

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YJ

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YK

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YM

12.3(14)YM13

12.3(14)YM13

12.3YQ

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YS

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YT

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YU

Vulnerable; first fixed in 12.4XB

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.3YX

12.3(14)YX14

12.3(14)YX14

12.3YZ

Vulnerable; contact TAC

  

12.3ZA

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

Affected 12.4-Based Releases

First Fixed Release

Recommended Release

12.4

12.4(19)

12.4(18a)

12.4(23a); Available on 05-JUN-2009

12.4(18e)

12.4(23a); Available on 05-JUN-2009

12.4JA

Not Vulnerable

  

12.4JDA

Not Vulnerable

  

12.4JK

Not Vulnerable

  

12.4JL

Not Vulnerable

  

12.4JMA

Vulnerable; contact TAC

  

12.4JMB

Vulnerable; contact TAC

  

12.4JX

Not Vulnerable

  

12.4MD

12.4(11)MD7

12.4(11)MD7

12.4MR

12.4(19)MR

12.4(19)MR2

12.4SW

Vulnerable; contact TAC

  

12.4T

12.4(20)T

12.4(15)T8

12.4(15)T9; Available on 29-APR-2009

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XA

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XB

12.4(15)T8

12.4(20)T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XC

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XD

12.4(4)XD12; Available on 27-MAR-2009

12.4(4)XD12; Available on 27-MAR-2009

12.4XE

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XF

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XG

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XJ

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XK

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XL

12.4(15)XL4

12.4(15)XL4

12.4XM

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XN

Vulnerable; contact TAC

  

12.4XP

Vulnerable; contact TAC

  

12.4XQ

12.4(15)XQ2

12.4(15)XQ2

12.4XR

12.4(15)XR4

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XT

Vulnerable; first fixed in 12.4T

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XV

Vulnerable; contact TAC

  

12.4XW

12.4(11)XW10

12.4(11)XW10

12.4XY

12.4(15)XY4

12.4(22)T1

12.4(15)T9; Available on 29-APR-2009

12.4XZ

Not Vulnerable

  

12.4YA

Not Vulnerable

  

12.4YB

Not Vulnerable

  

12.4YD

Not Vulnerable

  

Workarounds

The following mitigations have been identified for this vulnerability:

Infrastructure Access Control Lists

Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of networks. Infrastructure Access Control Lists (iACLs) are a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for these specific vulnerabilities. The iACL example below should be included as part of the deployed infrastructure access-list which will protect all devices with IP addresses in the infrastructure IP address range:


!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---
!--- Feature: Cisco Unified Communications Manager Express 
!---
!--- CAPF server configuration
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 3804


!---
!--- Telephony-Service configuration
!--- The TCP port is as per the ip source-address
!--- <ip-address> port <port-number> telephony
!--- service configuration command.  Example below 2999
!--- 


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 2999


!---
!--- Deny Cisco Unified Communications Manager Express traffic 
!--- from all other sources destined to infrastructure addresses.
!---


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 3804
access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 2999


!---
!--- Feature: SIP Gateway Signaling Support Over TLS Transport
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 5061


!--- Deny SIP Gateway Signaling Support Over TLS Transport 
!--- traffic from all other sources destined to infrastructure 
!--- addresses.


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 5061


!---
!--- Feature: Secure Signaling and Media Encryption
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 2443


!--- Deny Secure Signaling and Media Encryption traffic from all 
!--- other sources destined to infrastructure addresses.


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 2443


!---
!--- Feature: Blocks Extensible Exchange Protocol (BEEP)
!--- The TCP port used is defined with the netconf beep initiator 
!--- and netconf beep listener configuration
!--- commands.  This example uses 3001
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 3001


!--- Deny BEEP traffic from all other sources destined to 
!--- infrastructure addresses.


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 3001


!---
!--- Feature: Network Admission Control HTTP Authentication Proxy
!--- and
!--- Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 80
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 443


!---
!--- Deny Network Admission Control HTTP Authentication Proxy
!--- and
!--- Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass traffic to infrastructue
!---


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 80
access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 443


!---
!--- Features: Distributed Director with HTTP Redirects and DNS
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 53


!--- Deny Distributed Director with HTTP Redirects traffic and DNS 
!--- from all other sources destined to infrastructure addresses.


access-list 150 deny tcp any 
     INFRASTRUCTURE_ADDRESSES WILDCARD eq 53


!--- Permit/deny all other Layer 3 and Layer 4 traffic in 
!--- accordance with existing security policies and configurations
!--- Permit all other traffic to transit the device.


access-list 150 permit ip any any


!--- Apply access-list to all interfaces (only one example shown)


interface serial 2/0
ip access-group 150 in

The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml

Receive ACLs (rACL)

For distributed platforms, Receive ACLs may be an option starting in Cisco IOS Software Versions 12.0(21)S2 for the 12000 (GSR), 12.0(24)S for the 7500, and 12.0(31)S for the 10720. The Receive ACL protects the device from harmful traffic before the traffic can impact the route processor. Receive ACLs are designed to only protect the device on which it is configured. On the 12000, 7500, and 10720, transit traffic is never affected by a receive ACL. Because of this, the destination IP address "any" used in the example ACL entries below only refer to the router's own physical or virtual IP addresses. Receive ACLs are considered a network security best practice, and should be considered as a long-term addition to good network security, as well as a workaround for this specific vulnerability. The white paper entitled "GSR: Receive Access Control Lists" will help you identify and allow legitimate traffic to your device and deny all unwanted packets. This white paper is available at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a0a5e.shtml.

The following is the receive path ACL written to permit this type of traffic from trusted hosts:


!---
!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---

!---
!--- Feature: Cisco Unified Communications Manager Express 
!---
!---

!---
!--- Permit CAPF server traffic from trusted hosts allowed to 
!--- the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 3804


!---
!--- Telephony-Service configuration
!---

!---
!--- The TCP port is as per the ip source-address
!--- <address> port <port-number> telephony-service 
!--- configuration command.  Example below 2999
!---
!--- Permit Telephony-Service traffic from trusted hosts allowed 
!--- to the RP.


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 2999


!---
!--- Deny Cisco Unified Communications Manager Express 
!--- traffic from all other sources to the RP.
!---


access-list 150 deny tcp any any eq 3804
access-list 150 deny tcp any any eq 2999


!---
!--- Permit SIP Gateway Signaling Support Over TLS Transport
!--- traffic from trusted hosts allowed to the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 5061


!---
!--- Deny SIP Gateway Signaling Support Over TLS Transport 
!--- traffic from all other sources to the RP.
!---



access-list 150 deny tcp any any eq 5061


!---
!--- Permit Secure Signaling and Media Encryption traffic 
!--- from trusted hosts allowed to the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 2443


!---
!--- Deny Secure Signaling and Media Encryption traffic from 
!--- all other sources to the RP.
!---


access-list 150 deny tcp any any eq 2443


!---
!--- Feature: Blocks Extensible Exchange Protocol (BEEP)
!--- The TCP port used is defined with the netconf beep initiator 
!--- and netconf beep listener configuration commands.  
!--- This example uses 3001
!---

!---
!--- Permit BEEP traffic from trusted hosts allowed to the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 3001


!---
!--- Deny BEEP traffic from all other sources to the RP.
!---


access-list 150 deny tcp any any eq 3001


!---
!--- Feature: Network Admission Control HTTP Authentication Proxy
!--- and
!--- Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass
!---

!---
!--- Permit Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass traffic from trusted hosts allowed to 
!--- the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 80
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 443
 

!---
!--- Deny Network Admission Control HTTP Authentication Proxy
!--- and
!--- Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass traffic from all other sources to 
!--- the RP.
!---


access-list 150 deny tcp any any eq 80
access-list 150 deny tcp any any eq 443


!---
!--- Features: Distributed Director with HTTP Redirects and DNS
!---

!---
!--- Permit Distribute Director and DNS traffic from trusted hosts
!--- allowed to the RP.
!---


access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 53


!---
!--- Deny distributed director and DNS traffic from all other 
!--- sources to the RP.
!---


access-list 150 deny tcp any any eq 53


!---
!--- Permit all other traffic to the RP.
!--- according to security policy and configurations.
!---


access-list 150 permit ip any any


!---
!--- Apply this access list to the 'receive' path.
!---


ip receive access-list 150

Control Plane Policing

Control Plane Policing (CoPP) can be used to block the affected features TCP traffic access to the device. Cisco IOS software releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP can be configured on a device to protect the management and control planes and minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic that is sent to infrastructure devices in accordance with existing security policies and configurations. The CoPP example below should be included as part of the deployed CoPP which will protect all devices with IP addresses in the infrastructure IP address range. 


!---
!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---
!--- Feature: Cisco Unified Communications Manager Express
!---
!--- CAPF Server configuration
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 3804


!---

!--- Telephony-Service configuration
!--- The TCP port is as per the ip source-address
!--- <address> port <port-number> telephony-service
!--- configuration command.  Example below 2999
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 2999


!---
!--- Permit Cisco Unified Communications Manager Express traffic 
!--- sent to all IP addresses configured on all interfaces of 
!--- the affected device so that it will be policed and dropped
!--- by the CoPP feature
!---
!--- CAPF server configuration
!---


access-list 150 permit tcp any any eq 3804


!---
!--- Telephony-Service configuration
!---


access-list 150 permit tcp any any eq 2999


!---
!--- Feature: SIP Gateway Signaling Support Over TLS Transport
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 5061


!---
!--- Permit SIP Gateway Signaling Support Over TLS Transport 
!--- traffic sent to all IP addresses configured on all interfaces
!--- of the affected device so that it will be policed and  
!--- dropped by the CoPP feature
!--- 


access-list 150 permit tcp any any eq 5061


!---
!--- Feature: Secure Signaling and Media Encryption
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 2443


!---
!--- Permit Secure Signaling and Media Encryption traffic sent to
!--- all IP addresses configured on all interfaces of the affected 
!--- device so that it will be policed and dropped by the CoPP 
!--- feature
!---


access-list 150 permit tcp any any eq 2443


!---
!--- Feature: Blocks Extensible Exchange Protocol (BEEP)
!--- The TCP port used is defined with the netconf beep initiator 
!--- and netconf beep listener configuration commands.  
!--- This example uses 3001
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 3001


!---
!--- Permit BEEP traffic sent to all IP addresses configured
!--- on all interfaces of the affected device so that it
!--- will be policed and dropped by the CoPP feature
!---


access-list 150 permit tcp any any eq 3001


!---
!--- Feature: Network Admission Control HTTP Authentication Proxy
!--- and
!--- Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 80
access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 443


!---
!--- Permit Network Admission Control HTTP Authentication Proxy
!--- and Per-user URL Redirect for EAP over UDP, Dot1x and MAC 
!--- Authentication Bybass traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so that it
!--- will be policed and dropped by the CoPP feature
!---


access-list 150 permit tcp any any eq 80
access-list 150 permit tcp any any eq 443


!---
!--- Features: Distributed Director with HTTP Redirects and DNS
!---


access-list 150 deny tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
   any eq 53


!---
!--- Permit Distributed Director with HTTP Redirects and DNS 
!--- traffic sent to all IP addresses configured on all interfaces
!--- of the affected device so that it will be policed and dropped
!--- by the CoPP feature
!---


access-list 150 permit tcp any any eq 53


!---
!--- Permit (Police or Drop)/Deny (Allow) all other Layer3 and
!--- Layer4 traffic in accordance with existing security policies
!--- and configurations for traffic that is authorized to be sent
!--- to infrastructure devices
!---

!---
!--- Create a Class-Map for traffic to be policed by
!--- the CoPP feature
!---


class-map match-all drop-tcpip-class
match access-group 150


!---
!--- Create a Policy-Map that will be applied to the
!--- Control-Plane of the device.
!---


policy-map drop-tcpip-traffic

class drop-tcpip-class
drop


!---
!--- Apply the Policy-Map to the 
!--- Control-Plane of the device
!---


control-plane
service-policy input drop-tcpip-traffic

In the above CoPP example, the access control list entries (ACEs) that match the potential exploit packets with the "permit" action result in these packets being discarded by the policy-map "drop" function, while packets that match the "deny" action (not shown) are not affected by the policy-map drop function. Please note that the policy-map syntax is different in the 12.2S and 12.0S Cisco IOS trains:

policy-map drop-tcpip-traffic
class drop-tcpip-class
police 32000 1500 1500 conform-action drop exceed-action drop

Additional information on the configuration and use of the CoPP feature can be found in the documents, "Control Plane Policing Implementation Best Practices" and "Cisco IOS Software Releases 12.2 S - Control Plane Policing" at the following links http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html.

Additional mitigations that can be deployed on Cisco devices within the network are available in the "Cisco Applied Mitigation Bulletin" companion document for this advisory at the following link http://www.cisco.com/warp/public/707/cisco-amb-20090325-tcp-and-ip.shtml.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. 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.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was discovered by Cisco when performing internal vulnerability testing. We would also like to thank Jens Link, freelance consultant, for also reporting this vulnerability to us.

Status of this Notice: FINAL

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution

This advisory is posted on Cisco's worldwide website at :

http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History

Revision 1.4

2009-June-25

Removed references to the March/09 combined fixed software table.

Revision 1.3

2009-June-1

Updated expected public availability date for release 12.4(23a).

Revision 1.2

2009-May-1

Updated expected public availability date for release 12.4(23a).

Revision 1.1

2009-March-30

Specifically called out Wireless Products as not affected

Revision 1.0

2009-March-25

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.

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Updated: Jun 25, 2009Document ID: 109333