Summary

• Cisco IOS Software contains four vulnerabilities related to Cisco IOS Zone-Based Firewall features. These vulnerabilities are as follows:

  • Memory Leak Associated with Crafted IP Packets 
  • Memory Leak in HTTP Inspection 
  • Memory Leak in H.323 Inspection 
  • Memory Leak in SIP Inspection 

  Workarounds that mitigate these vulnerabilities are not available.

  
  

  Cisco has released software updates that address these vulnerabilities.

  
  

  This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-zbfw

  
  

  Note: The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.
  
  Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

  http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html

Affected Products

• 
  

  Vulnerable Products

  Cisco IOS devices running vulnerable versions of Cisco IOS Software are affected by four vulnerabilities in the Cisco IOS Zone-Based Firewall. The vulnerabilities are independent of each other. Details to confirm affected configurations are provided below.

  To determine whether a device is configured with Zone-Based Firewall, log in to the device and issue the show zone security command-line interface (CLI) command. If the output shows a member interface under a zone name, the device is vulnerable. The following example shows a device with Zone-Based Firewall rules configured on both GigabitEthernet0/0 and GigabitEthernet0/1:

  Router#show zone security
  zone self
    Description: System defined zone
  
  zone inside
    Description: *** Inside Network ***
    Member Interfaces:
      GigabitEthernet0/0
  
  zone outside
    Description: *** Outside Network ***
    Member Interfaces:
      GigabitEthernet0/1
  
  Router#

  The following sections provide more details on the specific features containing the vulnerabilities.
  
  

  Memory Leak Associated with Crafted IP Packets

  There is no specific configuration necessary for a device to be vulnerable to the memory leak associated with crafted IP packets. If the Zone-Based Firewall is configured, the device is vulnerable.

  
  

  Memory Leak in HTTP Inspection

  For the device to be vulnerable to the memory leak associated with HTTP inspection, the Zone-Based Firewall must be configured to perform HTTP inspection with the Zone-Based Firewall.

  
  

  To determine whether a device is configured for HTTP inspection, enter the command show policy-map type inspect zone-pair | include Match: protocol http. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall HTTP inspection:

  Router#show policy-map type inspect zone-pair | include Match: protocol http 
         Match: protocol http 

  Memory Leak in H.323 Inspection

  For a device to be vulnerable to the memory leak associated with H.323 inspection, the Zone-Based Firewall must be configured to perform H.323 inspection. To determine if a device is configured for H.323 inspection enter the command show policy-map type inspect zone-pair | include Match: protocol h323. If the output contains "Match: protocol h323" the device is vulnerable. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall H.323 inspection:

  Router# show policy-map type inspect zone-pair | include Match: protocol h323
          Match: protocol h323

  Memory Leak in SIP Inspection

  The device is vulnerable if the configuration has either a Layer 4 or Layer 7 Session Initiation Protocol (SIP) application-specific policy configured, and the policy is applied to any firewall zone. To determine whether a device is configured for SIP inspection enter the command show policy-map type inspect zone-pair | include Match: protocol sip. If the output contains "Match: protocol sip" the device is vulnerable. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall SIP inspection:

  Router# show policy-map type inspect zone-pair | include Match: protocol sip    
          Match: protocol sip

  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 15.0(1)M1 with an installed image name of C3900-UNIVERSALK9-M:

  Router> show version 
  Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
  Technical Support: http://www.cisco.com/techsupport
  Copyright (c) 1986-2009 by Cisco Systems, Inc.
  Compiled Wed 02-Dec-09 17:17 by prod_rel_team

  !--- output truncated 

  Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS and NX-OS Software Reference Guide" at http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

  
  

  Products Confirmed Not Vulnerable

  The following products are confirmed not vulnerable:
  

  • Cisco PIX 500 Series Firewall
  • Cisco ASA 5500 Series Adaptive Security Appliance
  • Firewall Services Module (FWSM) for Catalyst 6500 Series Switches and 7600 Series Routers
  • Virtual Firewall (VFW) application on the multiservice blade (MSB) on the Cisco XR 12000 Series Router
  • Cisco ACE Application Control Engine Module
  • Cisco IOS devices configured with legacy Cisco IOS Firewall support 
  • Cisco IOS XR Software
  • Cisco IOS XE Software
  • Cisco Catalyst 6500 Series ASA Services Module
  • Context-Based Access Control (CBAC) 

  No other Cisco products are currently known to be affected by these vulnerabilities.

Details

• Firewalls are networking devices that control access to the network assets of an organization. Firewalls are often positioned at the entrance points of networks. Cisco IOS Software provides a set of security features that allow the configuration of a firewall policy to match an organization's requirements. 

  
  

  The vulnerabilities described in this advisory affect the Zone-Based Firewall feature. The Zone-Based Policy Firewall (also known as Zone-Policy Firewall or ZFW) updates the firewall configuration from the older interface-based model to a more flexible, more easily understood zone-based model. Interfaces are assigned to zones, and inspection policy is applied to traffic moving between the zones. Inter-zone policies offer considerable flexibility and granularity, so different inspection policies can be applied to multiple host groups connected to the same router interface.

  
   More information on the Zone-Based Firewall is available at http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a008060f6dd.html. 
  
  

  Memory Leak Associated with Crafted IP Packets

  A vulnerability exists in the Zone-Based Firewall implementation in Cisco IOS Software that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. These vulnerabilities are triggered when the device that is running Cisco IOS Software processes crafted IP packets. Only traffic destined to an IP address configured on the device can trigger the vulnerability; transit traffic is not an exploit vector.

  
  

  This vulnerability is documented in Cisco bug ID CSCto89536 (registered customers only) and has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2012-1310.

  
  

  Memory Leak in HTTP Inspection

  The HTTP Inspection Engine feature allows users to configure their Cisco IOS Firewall to detect and filter HTTP connections—such as tunneling over port 80, unauthorized request methods, and non-HTTP compliant file transfers—that are not authorized within the scope of the security policy configuration.

  
  

  A vulnerability exists in the implementation of the Cisco IOS Software HTTP inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes certain HTTP messages. Transit HTTP traffic is an exploit vector.

  
  

  This vulnerability is documented in Cisco bug ID CSCtq36153 (registered customers only) and has been assigned CVE ID CVE-2012-0387.

  
  

  More information on HTTP inspection is available at http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gt_fwapc.html.

  
  

  Memory Leak in H.323 Inspection

  H.323 is the ITU standard for real-time multimedia communications and conferencing over packet-based (IP) networks. A vulnerability exists in the implementation of the Cisco IOS Software H.323 inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes malformed H.323 messages. Transit H.323 traffic is an exploit vector.

  
  

  This vulnerability is documented in Cisco bug ID CSCtq45553 (registered customers only) and has been assigned the CVE ID CVE-2012-0388.

  
  

  More information on H.323 inspection is available at http://www.cisco.com/en/US/docs/ios-xml/ios/sec_data_zbf/configuration/15-2mt/fw-h323-v3v4-sup.html.

  
  

  Memory Leak in SIP Inspection

  SIP is a popular signaling protocol that is used to manage voice and video calls across IP networks, such as the Internet. SIP is responsible for handling all aspects of call setup and termination. Voice and video are the most popular types of sessions that SIP handles, but the protocol has the flexibility to accommodate other applications that require call setup and termination. SIP call signaling can use UDP (port 5060), TCP (port 5060), or Transport Layer Security (TLS; TCP port 5061) as the underlying transport protocol.

  
  

  A vulnerability exists in the implementation of the Cisco IOS SIP inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes crafted SIP messages. Transit SIP traffic is an exploit vector.

  
  

  This vulnerability is documented in Cisco bug ID CSCti46171 (registered customers only) and has been assigned CVE ID CVE-2012-1315.

  
  

  More information on SIP inspection is available at http://www.cisco.com/en/US/docs/ios/security/configuration/guide/sec_sip_alg_aic.html.

  
  

  Memory Leak Detection

  Detected memory leaks can be viewed using the command show memory debug leaks chunks in privileged EXEC mode, as shown in the following example:

  Router# show memory debug leaks chunks 

  Adding blocks for GD... I/O memory Address Size Alloc_pc PID Alloc-Proc Name Chunk Elements:
  AllocPC Address Size Parent Name Processor memory Address Size Alloc_pc PID Alloc-Proc Name
  4733113C 188 419CB164 129 IP Input FW h225 tpkt

  The previous example shows a memory leak in the process FW h225 tpkt. The show memory debug leaks command was introduced in Cisco IOS Software versions 12.3(8)T1 and 12.2(25)S.

  
  

  Caution: All show memory debug commands must be used on customer networks only to diagnose the router for memory leaks when memory depletion is observed. These commands may cause high CPU utilization and may cause time-sensitive protocols to flap. These commands are recommended to be used in maintenance windows.
  

Workarounds

• There are no workarounds that mitigate the vulnerabilities described in this advisory.

Fixed Software

• `When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. 

  Cisco IOS Software

  Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release column. The First Fixed Release for All Advisories in the March 2012 Bundled Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.

  The Cisco IOS Software Checker allows customers to search for Cisco Security Advisories that address specific Cisco IOS Software releases. This tool is available on the Cisco Security (SIO) portal at https://sec.cloudapps.cisco.com/security/center/selectIOSVersion.x

  Major Release	Availability of Repaired Releases
  Affected 12.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.0 based releases
  Affected 12.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.2 based releases
  Affected 12.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.3 based releases
  Affected 12.4-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.4	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4GC	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JA	Not vulnerable	12.4(23c)JA4 12.4(25e)JA
  12.4JAX	Not vulnerable	Vulnerable; First fixed in Release 12.4JA
  12.4JDA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDD	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JDE	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JHA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JHB	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JHC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JK	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JL	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JX	Not vulnerable	Vulnerable; First fixed in Release 12.4JA
  12.4JY	Not vulnerable	Vulnerable; First fixed in Release 12.4JA
  12.4JZ	Not vulnerable	Vulnerable; First fixed in Release 12.4JA
  12.4MD	12.4(22)MD3; Available on 30-MAR-12	12.4(22)MD3; Available on 30-MAR-12
  12.4MDA	12.4(24)MDA11	12.4(24)MDA11
  12.4MDB	12.4(24)MDB5a	12.4(24)MDB5a
  12.4MDC	Not vulnerable	Not vulnerable
  12.4MR	Releases up to and including 12.4(19)MR3 are not vulnerable.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRA	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRB	Vulnerable; First fixed in Release 15.0M	Vulnerable; First fixed in Release 15.0M
  12.4SW	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4T	12.4(24)T7 Releases up to and including 12.4(15)T17 are not vulnerable.	12.4(15)T17 12.4(24)T7
  12.4XA	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XB	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XC	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XD	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XE	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XF	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XG	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XJ	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XK	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XL	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XM	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XN	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XP	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XQ	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XR	Vulnerable; First fixed in Release 12.4T Releases up to and including 12.4(15)XR10 are not vulnerable.	Vulnerable; First fixed in Release 12.4T
  12.4XT	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XV	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XW	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XY	Not vulnerable	Vulnerable; First fixed in Release 15.0M
  12.4XZ	Vulnerable; First fixed in Release 15.0M	Vulnerable; First fixed in Release 15.0M
  12.4YA	Vulnerable; First fixed in Release 15.0M	Vulnerable; First fixed in Release 15.0M
  12.4YB	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YD	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YE	12.4(24)YE3d	12.4(24)YE3d
  12.4YG	12.4(24)YG4	12.4(24)YG4
  Affected 15.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.0M	15.0(1)M8	15.0(1)M8
  15.0MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.0MRA	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.0S	Not vulnerable	15.0(1)S5 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SA	Not vulnerable	Not vulnerable
  15.0SE	Not vulnerable	15.0(1)SE1
  15.0SG	Not vulnerable	15.0(2)SG2 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SY	Not vulnerable	15.0(1)SY1
  15.0XA	Vulnerable; First fixed in Release 15.1T	Vulnerable; First fixed in Release 15.1T
  15.0XO	Not vulnerable	Vulnerable; First fixed in Release 15.0SG Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  Affected 15.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.1EY	Not vulnerable	15.1(2)EY2
  15.1GC	15.1(2)GC2	15.1(2)GC2
  15.1M	15.1(4)M3	15.1(4)M4; Available on 30-MAR-12
  15.1MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1S	Not vulnerable	15.1(3)S2 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SG	Not vulnerable	Not vulnerable
  15.1SNG	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SNH	Not vulnerable	Not vulnerable
  15.1T	15.1(3)T3	15.1(3)T3
  15.1XB	Vulnerable; First fixed in Release 15.1T	Vulnerable; First fixed in Release 15.1T
  Affected 15.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.2GC	15.2(1)GC2	15.2(1)GC2
  15.2S	Not vulnerable	15.2(1)S1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.2T	15.2(1)T2 15.2(2)T 15.2(2)T1	15.2(1)T2 15.2(2)T1 15.2(3)T; Available on 30-MAR-12

  
  * Cisco Catalyst 3550 Series Switches support the Internet Key Exchange (IKE) feature and are vulnerable to Cisco bug ID CSCts38429 when the devices are running Layer 3 images; however, this product reached the End of Software Maintenance milestone.  Cisco 3550 Series SMI Switches that are running Layer 2 images do not support IKE and are not vulnerable.  No other Cisco devices that run 12.2SE-based software are vulnerable.
  

  Cisco IOS XE Software

  Cisco IOS XE Software is not affected by the vulnerabilities that are disclosed in this document. 

  For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.
  
  Cisco IOS XR Software
  
  Cisco IOS XR Software is not affected by any of the vulnerabilities disclosed in the March 2012 Cisco IOS Software Security Advisory Bundled Publication.
  
  

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory. 

  These vulnerabilities were discovered by Cisco during normal internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-zbfw

Revision History

• Revision 1.0

  2012-March-28

  Initial public release

  Show Less