Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerabilities

Summary

• Multiple vulnerabilities exist in the Session Initiation Protocol (SIP) implementation in Cisco IOS^® Software that could allow an unauthenticated, remote attacker to cause a reload of an affected device when SIP operation is enabled.

  Cisco has released software updates that address these vulnerabilities. There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerabilities.

  This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-sip.

  Note: The September 22, 2010, Cisco IOS Software Security Advisory bundled publication includes six Cisco Security Advisories. Five of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on September 22, 2010, or earlier:

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-bundle

  Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

  http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep10.html

  Cisco Unified Communications Manager (CUCM) is affected by the vulnerabilities described in this advisory. Two separate Cisco Security Advisories have been published to disclose the vulnerabilities that affect the Cisco Unified Communications Manager at the following locations:

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090826-cucm

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-cucmsip

Affected Products

• These vulnerabilities only affect devices running Cisco IOS Software with SIP voice services enabled.

  Vulnerable Products

  Cisco devices are affected when they are running affected Cisco IOS Software versions that are configured to process SIP messages.

  Recent versions of Cisco IOS Software do not process SIP messages by default. Creating a dial peer by issuing the dial-peer voice command will start the SIP processes, causing the Cisco IOS device to process SIP messages. In addition, several features within Cisco Unified Communications Manager Express, such as ePhones, will also automatically start the SIP process when they are configured, causing the device to start processing SIP messages. An example of an affected configuration follows:

  dial-peer voice  voip
   ...
  !

  In addition to inspecting the Cisco IOS device configuration for a dial-peer command that causes the device to process SIP messages, administrators can also use the show processes | include SIP command to determine whether Cisco IOS Software is running the processes that handle SIP messages. In the following example, the presence of the processes CCSIP_UDP_SOCKET or CCSIP_TCP_SOCKET indicates that the Cisco IOS device will process SIP messages:

  Router# show processes | include SIP
   149 Mwe 40F48254            4          1    400023108/24000  0 CCSIP_UDP_SOCKET
   150 Mwe 40F48034            4          1    400023388/24000  0 CCSIP_TCP_SOCKET

  Note: Because there are several ways a device running Cisco IOS Software can start processing SIP messages, it is recommended that the show processes | include SIP command be used to determine whether the device is processing SIP messages instead of relying on the presence of specific configuration commands.

  Cisco Unified Border Element images are also affected by two of these vulnerabilities.

  Note: The Cisco Unified Border Element feature (previously known as the Cisco Multiservice IP-to-IP Gateway) is a special Cisco IOS Software image that runs on Cisco multiservice gateway platforms. It provides a network-to-network interface point for billing, security, call admission control, quality of service, and signaling interworking.

  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 identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed 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.

  Note: CUCM is affected by the vulnerabilities described in this advisory. Two separate Cisco Security Advisories have been published to disclose the vulnerabilities that affect the Cisco Unified Communications Manager at the following locations:

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090826-cucm

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-cucmsip

  Products Confirmed Not Vulnerable

  The SIP Application Layer Gateway (ALG), which is used by the Cisco IOS NAT and firewall features of Cisco IOS Software, is not affected by these vulnerabilities.

  Cisco IOS XR Software is not affected by these vulnerabilities.

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

Details

• 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.

  Three vulnerabilities exist in the SIP implementation in Cisco IOS Software that may allow a remote attacker to cause an affected device to reload. These vulnerabilities are triggered when the device running Cisco IOS Software processes crafted SIP messages.

  Note: In cases where SIP is running over TCP transport, a TCP three-way handshake is necessary to exploit these vulnerabilities.

  These vulnerabilities are addressed by Cisco bug IDs CSCta20040 ( registered customers only) , CSCsz43987 ( registered customers only) , and CSCtf72678 ( registered customers only) , and have been assigned Common Vulnerabilities and Exposures (CVE) IDs CVE-2010-2835, CVE-2009-2051, and CVE-2010-2834, respectively.

Workarounds

• If the affected Cisco IOS device requires SIP for VoIP services, SIP cannot be disabled, and no workarounds are available. Users are advised to apply mitigation techniques to help limit exposure to the vulnerabilities. Mitigation consists of allowing only legitimate devices to connect to affected devices. To increase effectiveness, the mitigation must be coupled with anti-spoofing measures on the network edge. This action is required because SIP can use UDP as the transport protocol.

  Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Cisco Applied Mitigation Bulletin:Identifying and Mitigating Exploitation of the Multiple Vulnerabilities in Cisco Voice Products", which is available at the following location:http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100922-voice.

  Disabling SIP Listening Ports

  For devices that do not require SIP to be enabled, the simplest and most effective workaround is to disable SIP processing on the device. Some versions of Cisco IOS Software allow administrators to disable SIP with the following commands:

  sip-ua
   no transport udp
   no transport tcp
   no transport tcp tls

  Warning: When applying this workaround to devices that are processing Media Gateway Control Protocol (MGCP) or H.323 calls, the device will not stop SIP processing while active calls are being processed. Under these circumstances, this workaround should be implemented during a maintenance window when active calls can be briefly stopped.

  The show udp connections, show tcp brief all, and show processes | include SIP commands can be used to confirm that the SIP UDP and TCP ports are closed after applying this workaround.

  Depending on the Cisco IOS Software version in use, the output from the show ip sockets command may still show the SIP ports open, but sending traffic to them will cause the SIP process to emit the following message:

  *Jun 2 11:36:47.691: sip_udp_sock_process_read: SIP UDP Listener is DISABLED

  Control Plane Policing

  For devices that need to offer SIP services, it is possible to use Control Plane Policing (CoPP) to block SIP traffic to the device from untrusted sources. Cisco IOS Releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP may be configured on a device to protect the management and control planes to minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. The following example can be adapted to specific network configurations:

  
  !-- The 192.168.1.0/24 network and the 172.16.1.1 host are trusted.
  !-- Everything else is not trusted. The following access list is used
  !-- to determine what traffic needs to be dropped by a control plane
  !-- policy (the CoPP feature.) If the access list matches (permit)
  !-- then traffic will be dropped and if the access list does not
  !-- match (deny) then traffic will be processed by the router.
  
  access-list 100 deny udp 192.168.1.0 0.0.0.255 any eq 5060
  access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5060
  access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5061
  access-list 100 deny udp host 172.16.1.1 any eq 5060
  access-list 100 deny tcp host 172.16.1.1 any eq 5060
  access-list 100 deny tcp host 172.16.1.1 any eq 5061
  access-list 100 permit udp any any eq 5060
  access-list 100 permit tcp any any eq 5060
  access-list 100 permit tcp any any eq 5061
  
  
  
  !-- 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-sip-class
    match access-group 100
  
  
  
  !-- Create a Policy-Map that will be applied to the
  !-- Control-Plane of the device.
  
  policy-map control-plane-policy
   class drop-sip-class
    drop
  
  
  
  !-- Apply the Policy-Map to the Control-Plane of the
  !-- device.
  
  control-plane
   service-policy input control-plane-policy

  Note: Because SIP can use UDP as a transport protocol, it is possible to easily spoof the IP address of the sender, which may defeat access control lists that permit communication to these ports from trusted IP addresses.

  In the above CoPP example, the access control 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. Additional information on the configuration and use of the CoPP feature can be found at 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.

Fixed Software

• 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 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 For This Advisory column. The First Fixed Release for All Advisories in the September 2010 Bundle 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.

  Major Release	Availability of Repaired Releases
  Affected 12.0-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  There are no affected 12.0-based releases
  Affected 12.1-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  There are no affected 12.1-based releases
  Affected 12.2-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  12.2	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2B	Not Vulnerable	Vulnerable; first fixed in 12.4T Releases up to and including 12.2(2)B7 are not vulnerable.
  12.2BC	Not Vulnerable	Not Vulnerable
  12.2BW	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2BX	Not Vulnerable	Vulnerable; first fixed in 12.2SB Releases up to and including 12.2(15)BX are not vulnerable.
  12.2BY	Not Vulnerable	Vulnerable; first fixed in 12.4T Releases up to and including 12.2(2)BY3 are not vulnerable.
  12.2BZ	Not Vulnerable	Not Vulnerable
  12.2CX	Not Vulnerable	Not Vulnerable
  12.2CY	Not Vulnerable	Not Vulnerable
  12.2CZ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2DA	Not Vulnerable	Not Vulnerable
  12.2DD	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2DX	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2EW	Not Vulnerable	Not Vulnerable
  12.2EWA	Not Vulnerable	Not Vulnerable
  12.2EX	Not Vulnerable	Not Vulnerable
  12.2EY	Not Vulnerable	Not Vulnerable
  12.2EZ	Not Vulnerable	Not Vulnerable
  12.2FX	Not Vulnerable	Not Vulnerable
  12.2FY	Not Vulnerable	Not Vulnerable
  12.2FZ	Not Vulnerable	Not Vulnerable
  12.2IRA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IRB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IRC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IRD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IRE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXF	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXG	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2IXH	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2JA	Not Vulnerable	Not Vulnerable
  12.2JK	Not Vulnerable	Not Vulnerable
  12.2MB	Not Vulnerable	Not Vulnerable
  12.2MC	Not Vulnerable	Releases up to and including 12.2(15)MC1 are not vulnerable. Releases 12.2(15)MC2b and later are not vulnerable; first fixed in 12.4T
  12.2MRA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2MRB	Not Vulnerable	12.2(33)MRB2
  12.2S	Not Vulnerable	Releases prior to 12.2(30)S are vulnerable, release 12.2(30)S and later are not vulnerable
  12.2SB	Not Vulnerable	12.2(31)SB19 Releases prior to 12.2(33)SB5 are vulnerable, release 12.2(33)SB5 and later are not vulnerable
  12.2SBC	Not Vulnerable	Vulnerable; first fixed in 12.2SB
  12.2SCA	Not Vulnerable	Vulnerable; first fixed in 12.2SCB
  12.2SCB	Not Vulnerable	12.2(33)SCB9
  12.2SCC	Not Vulnerable	12.2(33)SCC5
  12.2SCD	Not Vulnerable	12.2(33)SCD3
  12.2SE	Not Vulnerable	Not Vulnerable
  12.2SEA	Not Vulnerable	Not Vulnerable
  12.2SEB	Not Vulnerable	Not Vulnerable
  12.2SEC	Not Vulnerable	Not Vulnerable
  12.2SED	Not Vulnerable	Not Vulnerable
  12.2SEE	Not Vulnerable	Not Vulnerable
  12.2SEF	Not Vulnerable	Not Vulnerable
  12.2SEG	Not Vulnerable	Not Vulnerable
  12.2SG	Not Vulnerable	Releases prior to 12.2(40)SG are vulnerable, release 12.2(40)SG and later are not vulnerable; migrate to any release in 12.2SGA
  12.2SGA	Not Vulnerable	Not Vulnerable
  12.2SL	Not Vulnerable	Not Vulnerable
  12.2SM	Not Vulnerable	Not Vulnerable
  12.2SO	Not Vulnerable	Not Vulnerable
  12.2SQ	Not Vulnerable	Not Vulnerable
  12.2SRA	Not Vulnerable	Releases prior to 12.2(33)SRA6 are vulnerable, release 12.2(33)SRA6 and later are not vulnerable
  12.2SRB	Not Vulnerable	Releases prior to 12.2(33)SRB1 are vulnerable, release 12.2(33)SRB1 and later are not vulnerable
  12.2SRC	Not Vulnerable	Not Vulnerable
  12.2SRD	Not Vulnerable	Not Vulnerable
  12.2SRE	Not Vulnerable	12.2(33)SRE1
  12.2STE	Not Vulnerable	Not Vulnerable
  12.2SU	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2SV	Not Vulnerable	Releases prior to 12.2(29b)SV1 are vulnerable, release 12.2(29b)SV1 and later are not vulnerable; migrate to any release in 12.2SVD
  12.2SVA	Not Vulnerable	Not Vulnerable
  12.2SVC	Not Vulnerable	Not Vulnerable
  12.2SVD	Not Vulnerable	Not Vulnerable
  12.2SVE	Not Vulnerable	Not Vulnerable
  12.2SW	Not Vulnerable	Releases up to and including 12.2(21)SW1 are not vulnerable. Releases 12.2(25)SW12 and later are not vulnerable; first fixed in 12.4T
  12.2SX	Not Vulnerable	Releases up to and including 12.2(14)SX2 are not vulnerable.
  12.2SXA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2SXB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2SXD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2SXE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2SXF	Not Vulnerable	Releases prior to 12.2(18)SXF11 are vulnerable, release 12.2(18)SXF11 and later are not vulnerable
  12.2SXH	Not Vulnerable	Not Vulnerable
  12.2SXI	Not Vulnerable	Not Vulnerable
  12.2SY	Vulnerable; migrate to any release in 12.2S	Not Vulnerable
  12.2SZ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2T	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2TPC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2XA	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XB	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XC	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XD	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XE	Not Vulnerable	Not Vulnerable
  12.2XF	Not Vulnerable	Not Vulnerable
  12.2XG	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XH	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XI	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XJ	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XK	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XL	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XM	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XN	Not Vulnerable	Vulnerable; first fixed in 12.2SB
  12.2XNA	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNB	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNC	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XND	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNE	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNF	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XO	Not Vulnerable	Not Vulnerable
  12.2XQ	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XR	Not Vulnerable	Not Vulnerable
  12.2XS	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XT	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XU	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XV	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2XW	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2YA	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2YB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YF	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YG	Not Vulnerable	Not Vulnerable
  12.2YH	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YJ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YK	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YL	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YM	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2YN	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YO	Not Vulnerable	Not Vulnerable
  12.2YP	Not Vulnerable	Not Vulnerable
  12.2YQ	Not Vulnerable	Not Vulnerable
  12.2YR	Not Vulnerable	Not Vulnerable
  12.2YS	Not Vulnerable	Not Vulnerable
  12.2YT	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YU	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YV	Not Vulnerable	Releases prior to 12.2(11)YV1 are vulnerable, release 12.2(11)YV1 and later are not vulnerable
  12.2YW	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YX	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YY	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2YZ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZA	Not Vulnerable	Not Vulnerable
  12.2ZB	Not Vulnerable	Releases up to and including 12.2(8)ZB are not vulnerable.
  12.2ZC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZE	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2ZF	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2ZG	Not Vulnerable	Not Vulnerable
  12.2ZH	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.2ZJ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZL	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZP	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZU	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZX	Not Vulnerable	Not Vulnerable
  12.2ZY	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.2ZYA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  Affected 12.3-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  12.3	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3B	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3BC	Not Vulnerable	Not Vulnerable
  12.3BW	Not Vulnerable	Not Vulnerable
  12.3EU	Not Vulnerable	Not Vulnerable
  12.3JA	Not Vulnerable	Not Vulnerable
  12.3JEA	Not Vulnerable	Not Vulnerable
  12.3JEB	Not Vulnerable	Not Vulnerable
  12.3JEC	Not Vulnerable	Not Vulnerable
  12.3JED	Not Vulnerable	Not Vulnerable
  12.3JK	Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable; first fixed in 12.4T	Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable; first fixed in 12.4T
  12.3JL	Not Vulnerable	Not Vulnerable
  12.3JX	Not Vulnerable	Not Vulnerable
  12.3T	Vulnerable; first fixed in 12.4T Releases up to and including 12.3(4)T11 are not vulnerable.	Vulnerable; first fixed in 12.4T
  12.3TPC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.3VA	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XA	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3XB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.3XC	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3XD	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XE	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3XF	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
  12.3XG	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XI	Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable	Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable; first fixed in 12.2SB
  12.3XJ	Vulnerable; migrate to any release in 12.4XN	Vulnerable; first fixed in 12.4XR
  12.3XK	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XL	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XQ	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XR	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XS	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3XU	Vulnerable; first fixed in 12.4T Releases up to and including 12.3(8)XU1 are not vulnerable.	Vulnerable; first fixed in 12.4T
  12.3XW	Vulnerable; migrate to any release in 12.4XN	Vulnerable; first fixed in 12.4T
  12.3XX	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XY	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3XZ	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YA	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YD	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YF	Vulnerable; migrate to any release in 12.4XN	Vulnerable; first fixed in 12.4XR
  12.3YG	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YH	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YI	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YJ	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.3YK	Releases prior to 12.3(11)YK3 are vulnerable, release 12.3(11)YK3 and later are not vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YM	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YQ	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YS	Vulnerable; first fixed in 12.4T Releases up to and including 12.3(11)YS1 are not vulnerable.	Vulnerable; first fixed in 12.4T
  12.3YT	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YU	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.3YX	Vulnerable; migrate to any release in 12.4XN	Vulnerable; first fixed in 12.4XR
  12.3YZ	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
  12.3ZA	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  Affected 12.4-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  12.4	12.4(25d)	12.4(25d)
  12.4GC	12.4(24)GC2	12.4(24)GC2
  12.4JA	Not Vulnerable	Not Vulnerable
  12.4JDA	Not Vulnerable	Not Vulnerable
  12.4JDC	Not Vulnerable	Not Vulnerable
  12.4JDD	Not Vulnerable	Not Vulnerable
  12.4JHA	Not Vulnerable	Not Vulnerable
  12.4JHB	Not Vulnerable	Not Vulnerable
  12.4JK	Not Vulnerable	Not Vulnerable
  12.4JL	Not Vulnerable	Not Vulnerable
  12.4JMA	Not Vulnerable	Not Vulnerable
  12.4JMB	Not Vulnerable	Not Vulnerable
  12.4JX	Not Vulnerable	Not Vulnerable
  12.4JY	Not Vulnerable	Not Vulnerable
  12.4MD	Not Vulnerable	12.4(24)MD2
  12.4MDA	Not Vulnerable	12.4(22)MDA4
  12.4MR	Vulnerable; first fixed in 12.4MRA	Vulnerable; first fixed in 12.4MRA
  12.4MRA	12.4(20)MRA1	12.4(20)MRA1
  12.4SW	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.4T	12.4(15)T14 12.4(24)T4 12.4(20)T6	12.4(15)T14 12.4(24)T4 12.4(20)T6
  12.4XA	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XB	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XC	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XD	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XE	Releases prior to 12.4(6)XE5 are vulnerable, release 12.4(6)XE5 and later are not vulnerable; first fixed in 12.4T	Releases prior to 12.4(6)XE5 are vulnerable, release 12.4(6)XE5 and later are not vulnerable; first fixed in 12.4T
  12.4XF	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.4XG	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.4XJ	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XK	Not Vulnerable	Vulnerable; first fixed in 12.4T
  12.4XL	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
  12.4XM	Releases up to and including 12.4(15)XM are not vulnerable. Releases 12.4(15)XM3 and later are not vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XN	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.4XP	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
  12.4XQ	Not Vulnerable	12.4(15)XQ6; Available on 22-SEP-10
  12.4XR	Not Vulnerable	12.4(15)XR9 12.4(22)XR7
  12.4XT	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XV	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
  12.4XW	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XY	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4XZ	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  12.4YA	Vulnerable; first fixed in 12.4T	Vulnerable; first fixed in 12.4T
  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	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
  12.4YE	Not Vulnerable	12.4(24)YE1
  12.4YG	Not Vulnerable	12.4(24)YG3
  Affected 15.0-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  15.0M	15.0(1)M3	15.0(1)M3
  15.0S	Cisco 7600 and 10000 Series routers: Not Vulnerable Cisco ASR 1000 Series routes: Please see Cisco IOS-XE Software Availability	Cisco 7600 and 10000 Series routers: 15.0(1)S1 (available early October 2010). Cisco ASR 1000 Series routes: Please see Cisco IOS-XE Software Availability
  15.0XA	15.0(1)XA4	Vulnerable; first fixed in 15.1T
  15.0XO	Not Vulnerable	Not Vulnerable
  Affected 15.1-Based Releases	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  15.1T	15.1(2)T0a 15.1(1)T1	15.1(2)T1
  15.1XB	15.1(1)XB	Vulnerable; first fixed in 15.1T

  Cisco IOS XE Software

  Cisco IOS XE Release	First Fixed Release for This Advisory	First Fixed Release for All Advisories in the September 2010 Bundle Publication
  2.1.x	Not Vulnerable	Not Vulnerable
  2.2.x	Not Vulnerable	Not Vulnerable
  2.3.x	Not Vulnerable	Not Vulnerable
  2.4.x	Not Vulnerable	Not Vulnerable
  2.5.x	Vulnerable; migrate to 2.6.2 or later	Vulnerable; migrate to 2.6.2 or later
  2.6.x	2.6.1	2.6.2
  3.1.xS	Not Vulnerable	Not Vulnerable

  For mapping of Cisco IOS XE to Cisco IOS releases, please refer to the Cisco IOS XE 2 and Cisco IOS XE 3S Release Notes.

  Cisco IOS XR System Software

  Cisco IOS XR Software is not affected by the vulnerabilities disclosed in the September 22, 2010, Cisco IOS Software Security Advisory bundled publication.

Exploitation and Public Announcements

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

  These vulnerabilities were discovered by Cisco during internal testing.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-sip

Revision History

• Revision 1.0

  2010-September-22

  Initial public release.

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