A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger an interface queue wedge on the affected device. The vulnerability is due to improper parsing of UDP RSVP packets. An attacker could exploit this vulnerability by sending UDP port 1698 RSVP packets to the vulnerable device. An exploit could cause Cisco IOS Software and Cisco IOS XE Software to incorrectly process incoming packets, resulting in an interface queue wedge, which can lead to loss of connectivity, loss of routing protocol adjacency, and other denial of service (DoS) conditions. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-rsvp Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled publication includes eight Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2013 bundled publication. 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_sep13.html
Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled publication includes eight Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2013 bundled publication.
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_sep13.html
Only devices with specific configurations are affected. Cisco devices that are running affected Cisco IOS Software or Cisco IOS XE Software versions are vulnerable when they have RSVP enabled and also have one or more virtual routing and forwarding (VRF) interfaces. A device is vulnerable if both of the following criteria are met:
Some example scenarios are as follows:
If the device is configured with RSVP the output will indicate that RSVP is enabled as shown in the following example:Router#show ip rsvp
RSVP: disabled (not enabled on any interface)
Note: Cisco 7600 Software images will enable RSVP on an internal VLAN context when MPLS is enabled on the device.Router#show ip rsvp
RSVP: enabled (on 1 interface(s))
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.
The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists and is available at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml!---!--- Feature: RSVP over UDP!--- access-list 150 permit udp TRUSTED_SOURCE_ADDRESSES WILDCARD INFRASTRUCTURE_ADDRESSES WILDCARD eq 1698 !--- Deny RSVP over UDP traffic from all other sources destined !--- to infrastructure addresses. access-list 150 deny udp any INFRASTRUCTURE_ADDRESSES WILDCARD eq 1698 !--- 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 fastEthernet 2/0 ip access-group 150 in
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 software trains:!--- Feature: RSVP over UDP access-list 150 deny udp TRUSTED_SOURCE_ADDRESSES WILDCARD any eq 1698 !--- Deny RSVP over UDP traffic from all other sources destined !--- to the device control plane. access-list 150 permit udp any any eq 1698 !--- 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-udp-class match access-group 150 !--- Create a Policy-Map that will be applied to the !--- Control-Plane of the device. policy-map drop-udp-traffic class drop-udp-class drop !--- Apply the Policy-Map to the !--- Control-Plane of the device control-plane service-policy input drop-udp-traffic
Additional information on the configuration and use of the CoPP feature can be found in the documents, "Control Plane Policing Implementation Best Practices" and "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_4t/12_4t4/htcpp.htmlpolicy-map drop-udp-traffic class drop-udp-class police 32000 1500 1500 conform-action drop exceed-action drop
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 September 2013 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 http://tools.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 September 2013 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 September 2013 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 September 2013 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 September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 12.4 based releases | ||
Affected 15.0-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.0EA | Not vulnerable |
15.0(2)EA1 |
15.0EB | Not vulnerable |
Vulnerable; migrate to any release in 15.2E |
15.0EC | Not vulnerable |
Vulnerable; migrate to any release in 15.2E |
15.0ED | Not vulnerable |
Note: Releases prior to 15.0(2)ED1 are vulnerable; Releases 15.0(2)ED1 and later are not vulnerable. |
15.0EH | Not vulnerable |
Not vulnerable |
15.0EJ | Not vulnerable |
Not vulnerable |
15.0EX | Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.0EY | Not vulnerable |
15.0(2)EY2 |
15.0EZ | Not vulnerable |
Only Release 15.0(2)EZ is vulnerable |
15.0M | Vulnerable; First fixed in Release 15.1M |
Vulnerable; First fixed in Release 15.1M |
15.0MR | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.0S | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
Vulnerable; First fixed in Release 15.1S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.0SE | Not vulnerable |
15.0(2)SE4 |
15.0SG | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.0SQA | Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.0SQB | Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.0SY | 15.0(1)SY5 |
15.0(1)SY5 |
15.0XA | Vulnerable; First fixed in Release 15.1M |
Vulnerable; First fixed in Release 15.1M |
15.0XO | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
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 September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.1EY | Vulnerable; First fixed in Release 15.2S |
Vulnerable; First fixed in Release 15.2S |
15.1GC | Vulnerable; First fixed in Release 15.1M |
Vulnerable; First fixed in Release 15.1M |
15.1M | 15.1(4)M7 |
15.1(4)M7 |
15.1MR | 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. |
15.1MRA | 15.1(3)MRA2 |
15.1(3)MRA2 |
15.1S | 15.1(3)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1(3)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1SG | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1(2)SG1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1SNG | 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. |
15.1SNH | 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. |
15.1SNI | 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. |
15.1SVD | Not vulnerable |
Not vulnerable |
15.1SVE | Not vulnerable |
Not vulnerable |
15.1SVF | Not vulnerable |
Not vulnerable |
15.1SY | 15.1(1)SY2; Available on 28-OCT-13 15.1(2)SY |
15.1(1)SY2; Available on 28-OCT-13 15.1(2)SY |
15.1T | Vulnerable; First fixed in Release 15.1M |
Vulnerable; First fixed in Release 15.1M |
15.1XO | Not vulnerable |
Not vulnerable |
Affected 15.2-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.2E | Not vulnerable |
Not vulnerable |
15.2GC | 15.2(4)GC |
Vulnerable; migrate to any release in 15.4T |
15.2JA | Not vulnerable |
15.2(4)JA1 |
15.2JAX | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.2JB | Not vulnerable |
15.2(2)JB2 |
15.2JN | Not vulnerable |
Not vulnerable |
15.2M | 15.2(4)M4 |
15.2(4)M4 |
15.2S | 15.2(4)S4 |
15.2(4)S4 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.2SA | 15.2(2)SA |
15.2(2)SA |
15.2SNG | 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. |
15.2SNH | 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. |
15.2SNI | Vulnerable; First fixed in Release 15.3S |
Vulnerable; First fixed in Release 15.3S |
15.2T | 15.2(2)T4 15.2(3)T4 |
15.2(3)T4 |
Affected 15.3-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.3M | Not vulnerable |
Not vulnerable |
15.3S | 15.3(2)S 15.3(3)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.3(2)S2 15.3(3)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.3T | 15.3(1)T2 15.3(2)T1 |
15.3(1)T2 15.3(2)T1 |
Cisco IOS XE Software Release | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
---|---|---|
2.1.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
2.2.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
2.3.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
2.4.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
2.5.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
2.6.x | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
3.1.xS | Not vulnerable | Vulnerable; migrate to 3.4.6S or later. |
3.1.xSG | Not vulnerable | Vulnerable; contact your support organization. |
3.2.xS | Vulnerable; migrate to 3.4.6S or later. | Vulnerable; migrate to 3.4.6S or later. |
3.2.xSE | Not vulnerable | 3.2.3SE |
3.2.xSG | Not vulnerable | Vulnerable; migrate to 3.4.1SG or later. |
3.2.xXO | Not vulnerable | Vulnerable; migrate to 3.3.0XO or later. |
3.2.xSQ | Not vulnerable | Vulnerable; migrate to 3.3.0SQ or later. |
3.3.xS | Vulnerable; migrate to 3.4.6S or later. | Vulnerable; migrate to 3.4.6S or later. |
3.3xSG | Not vulnerable | Vulnerable; migrate to 3.4.1SG or later. |
3.3xXO | Not vulnerable | Not vulnerable |
3.3xSQ | Not vulnerable | Not vulnerable |
3.4.xS | 3.4.6S | 3.4.6S |
3.4.xSG | Not vulnerable | 3.4.1SG * |
3.5.xE | Not vulnerable | Not vulnerable |
3.5.xS | Vulnerable; migrate to 3.7.4S or later. | Vulnerable; migrate to 3.7.4S or later. |
3.6.xS | Vulnerable; migrate to 3.7.4S or later. | Vulnerable; migrate to 3.7.4S or later. |
3.7.xS | 3.7.4S | 3.7.4S |
3.8.xS | Vulnerable; migrate to 3.9.0S or later. | Vulnerable; migrate to 3.9.2S or later. |
3.9.xS | Not vulnerable | 3.9.2S |
3.10.xS | Not vulnerable | Not vulnerable |
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
This vulnerability was discovered by Cisco during internal security testing.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Revision 1.1 | 2014-March-12 | Added additional details in "Affected Products" section to help determine if RSVP is enabled. |
Revision 1.0 | 2013-September-25 | Initial public release |
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