var-201203-0329
Vulnerability from variot
The RSVP feature in Cisco IOS 15.0 and 15.1 and IOS XE 3.2.xS through 3.4.xS before 3.4.2S, when a VRF interface is configured, allows remote attackers to cause a denial of service (interface queue wedge and service outage) via crafted RSVP packets, aka Bug ID CSCts80643. Cisco IOS is a popular Internet operating system. This vulnerability allows unauthenticated remote attackers to cause link loss on the interface, routing protocol adjacency Lost and other denial of service conditions. Successful exploits will result in a denial-of-service condition. This issue is being tracked by Cisco Bug ID CSCts80643. ----------------------------------------------------------------------
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TITLE: Cisco IOS RSVP Denial of Service Vulnerability
SECUNIA ADVISORY ID: SA48611
VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/48611/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=48611
RELEASE DATE: 2012-03-29
DISCUSS ADVISORY: http://secunia.com/advisories/48611/#comments
AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s)
http://secunia.com/advisories/48611/
ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS
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DESCRIPTION: A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the RSVP feature and can be exploited to e.g. cause a loss in connectivity via crafted RSVP packets.
Please see the vendor's advisory for a list of affected versions.
SOLUTION: Update to a fixed version (please see the vendor's advisory for details).
PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.
ORIGINAL ADVISORY: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXPLOIT: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities.
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.
For more information: SA48611
The vulnerability is reported in versions 3.2.xS and 3.3.xS. This vulnerability could be exploited repeatedly to cause an extended DoS condition.
A workaround is available to mitigate this vulnerability.
Cisco has released free software updates that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp
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 +------------------
Only devices with specific configurations are affected. A device is vulnerable if both the following criteria are met:
- At least one VRF is configured without RSVP
- At least one other interface (physical or virtual), not in the same VRF, is configured with RSVP
Some example scenarios are as follows:
- RSVP-Traffic Engineering (RSVP-TE) in Multiprotocol Label Switching (MPLS) infrastructures
- Multi-VRF infrastructures
- VRF-Lite infrastructures
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. 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 +--------------------------------
Cisco IOS-XR software is not affected by this vulnerability.
No other Cisco products are currently known to be affected by this vulnerability. This vulnerability could be exploited repeatedly to cause an extended DoS condition.
A device is vulnerable if it is configured with VRF and none of the interfaces in that VRF have RSVP enabled, but any other interface (physical or virtual) does have RSVP enabled.
An attacker with some knowledge of the affected infrastructure could exploit this vulnerability by sending RSVP packets to vulnerable devices.
A workaround is available to mitigate this vulnerability.
In devices that meet the vulnerable configuration criteria, valid RSVP packets could trigger this vulnerability. An attacker with knowledge of the infrastructure could craft valid RSVP packets with set conditions to exploit this vulnerability. Recovery from this interface queue wedge requires a reload of the device.
For more information about queue wedges and a few detection mechanisms that may be used to identify a blocked interface on Cisco IOS Software (including a white paper describing how this condition can be detected using SNMP) see: http://blogs.cisco.com/security/comments/cisco_ios_queue_wedges_explained
This vulnerability has been documented in Cisco bug ID CSCts80643 and has been assigned the Common Vulnerabilities and Exposures (CVE) ID CVE-2012-1311.
Vulnerability Scoring Details
Cisco has scored the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.
Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.
Cisco has provided additional information regarding CVSS at the following link:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:
http://intellishield.cisco.com/security/alertmanager/cvss
- CSCts80643 - Cisco IOS Software RSVP Denial of Service Vulnerability
CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
Impact
Successful exploitation of this vulnerability will result in an interface queue wedge, which can lead to loss of connectivity, loss of routing protocol adjacency, and other DoS conditions. This vulnerability could be exploited repeatedly to cause an extended DoS condition.
Software Versions and Fixes
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. 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. This tool is available on the Cisco Security Intelligence Operations (SIO) portal at: http://tools.cisco.com/security/center/selectIOSVersion.x
+--------------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |----------+---------------------------------------------------------| | Affected | |First Fixed Release for All | |12.0-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |--------------------------------------------------------------------| | There are no affected 12.0 based releases | |--------------------------------------------------------------------| | Affected | |First Fixed Release for All | |12.2-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |--------------------------------------------------------------------| | There are no affected 12.2 based releases | |--------------------------------------------------------------------| | Affected | |First Fixed Release for All | |12.3-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |--------------------------------------------------------------------| | There are no affected 12.3 based releases | |--------------------------------------------------------------------| | Affected | |First Fixed Release for All | |12.4-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |--------------------------------------------------------------------| | There are no affected 12.4 based releases | |--------------------------------------------------------------------| | Affected | |First Fixed Release for All | |15.0-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |----------+----------------------------+----------------------------| |15.0M |15.0(1)M8 |15.0(1)M8 | |----------+----------------------------+----------------------------| | | |Vulnerable; contact your | | | |support organization per the| |15.0MR |Not vulnerable |instructions in Obtaining | | | |Fixed Software section of | | | |this advisory. | |----------+----------------------------+----------------------------| | | |Vulnerable; contact your | | | |support organization per the| |15.0MRA |Not vulnerable |instructions in Obtaining | | | |Fixed Software section of | | | |this advisory. | |----------+----------------------------+----------------------------| | |Not vulnerable |15.0(1)S5 | |15.0S |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please| | |see Cisco IOS XE Software |see Cisco IOS XE Software | | |Availability |Availability | |----------+----------------------------+----------------------------| |15.0SA |Not vulnerable |Not vulnerable | |----------+----------------------------+----------------------------| |15.0SE |Not vulnerable |15.0(1)SE1 | |----------+----------------------------+----------------------------| | |Not vulnerable |15.0(2)SG2 | |15.0SG |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please| | |see Cisco IOS XE Software |see Cisco IOS XE Software | | |Availability |Availability | |----------+----------------------------+----------------------------| |15.0SY |15.0(1)SY1 |15.0(1)SY1 | |----------+----------------------------+----------------------------| |15.0XA |Vulnerable; First fixed in |Vulnerable; First fixed in | | |Release 15.1T |Release 15.1T | |----------+----------------------------+----------------------------| | |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please| |15.0XO |see Cisco IOS XE Software |see Cisco IOS XE Software | | |Availability |Availability | |----------+----------------------------+----------------------------| | Affected | |First Fixed Release for All | |15.1-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |----------+----------------------------+----------------------------| |15.1EY |15.1(2)EY2 |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 | | |15.1(4)M3a |30-MAR-12 | |----------+----------------------------+----------------------------| | |Vulnerable; contact your |Vulnerable; contact your | | |support organization per the|support organization per the| |15.1MR |instructions in Obtaining |instructions in Obtaining | | |Fixed Software section of |Fixed Software section of | | |this advisory. |this advisory. | |----------+----------------------------+----------------------------| | |15.1(3)S2 |15.1(3)S2 | |15.1S |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please| | |see Cisco IOS XE Software |see Cisco IOS XE Software | | |Availability |Availability | |----------+----------------------------+----------------------------| | |Not vulnerable |Not vulnerable | |15.1SG |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please| | |see Cisco IOS XE Software |see Cisco IOS XE Software | | |Availability |Availability | |----------+----------------------------+----------------------------| | |Vulnerable; contact your |Vulnerable; contact your | | |support organization per the|support organization per the| |15.1SNG |instructions in Obtaining |instructions in Obtaining | | |Fixed Software section of |Fixed Software section of | | |this advisory. |this advisory. | |----------+----------------------------+----------------------------| |15.1SNH |Not vulnerable |Not vulnerable | |----------+----------------------------+----------------------------| | |15.1(1)T5; Available on | | | |18-MAY-12 | | |15.1T |15.1(2)T5; Available on |15.1(3)T3 | | |27-APR-12 | | | |15.1(3)T3 | | |----------+----------------------------+----------------------------| |15.1XB |Vulnerable; First fixed in |Vulnerable; First fixed in | | |Release 15.1T |Release 15.1T | |----------+----------------------------+----------------------------| | Affected | |First Fixed Release for All | |15.2-Based| First Fixed Release |Advisories in the March 2012| | Releases | |Cisco IOS Software Security | | | |Advisory Bundled Publication| |--------------------------------------------------------------------| | There are no affected 15.2 based releases | +--------------------------------------------------------------------+
Cisco IOS XE Software +--------------------
Cisco IOS XE Software is affected by the vulnerability that is disclosed in this document.
+---------------------------------------+ | | | First Fixed | | | | Release for | | | | All | | Cisco | | Advisories | | IOS XE | First Fixed | in the March | | Software | Release | 2012 Cisco | | Release | | IOS Software | | | | Security | | | | Advisory | | | | Bundled | | | | Publication | |----------+-------------+--------------| | | | Vulnerable; | | 2.1.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 2.2.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 2.3.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 2.4.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 2.5.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 2.6.x | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 3.1.xS | Not | migrate to | | | vulnerable | 3.4.2S or | | | | later. | |----------+-------------+--------------| | | | Vulnerable; | | 3.1xSG | Not | migrate to | | | vulnerable | 3.2.2SG or | | | | later. | |----------+-------------+--------------| | | Vulnerable; | Vulnerable; | | 3.2.xS | migrate to | migrate to | | | 3.4.2S or | 3.4.2S or | | | later. | later. | |----------+-------------+--------------| | 3.2xSG | Not | 3.2.2SG | | | vulnerable | | |----------+-------------+--------------| | | Vulnerable; | Vulnerable; | | 3.3.xS | migrate to | migrate to | | | 3.4.2S or | 3.4.2S or | | | later. | later.
Workarounds
It is possible to mitigate the vulnerability in this advisory by applying the global configuration command ip rsvp listener vrf vrf-name ip-address 0 0 announce, where the IP address is one that does not exist on the device or in the routing tables.
Obtaining Fixed Software
Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.
Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at: http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html or as set forth 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, upgrades should be obtained through the Software Center on Cisco.com at http://www.cisco.com
Customers Using Third-Party Support Organizations +------------------------------------------------
Customers with Cisco products that 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 organization for assistance with the appropriate course of action.
The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.
Customers Without Service Contracts +----------------------------------
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
- +1 800 553 2447 (toll free from within North America)
- +1 408 526 7209 (toll call from anywhere in the world)
- e-mail: tac@cisco.com
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.
Refer to Cisco Worldwide Contacts at: http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.
Exploitation and Public Announcements
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 testing.
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 the Cisco Security Intelligence Operations portal at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp
Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:
- cust-security-announce@cisco.com
- first-bulletins@lists.first.org
- bugtraq@securityfocus.com
- vulnwatch@vulnwatch.org
- cisco@spot.colorado.edu
- cisco-nsp@puck.nether.net
- full-disclosure@lists.grok.org.uk
Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.
Revision History
+---------------------------------------+ | Revision | | Initial | | 1.0 | 2012-March-28 | public | | | | release | +---------------------------------------+
Cisco Security Procedures
Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at: http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This web page includes instructions for press inquiries regarding Cisco Security Advisories.
All Cisco Security Advisories are available at: http://www.cisco.com/go/psirt
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"data": "The RSVP feature in Cisco IOS 15.0 and 15.1 and IOS XE 3.2.xS through 3.4.xS before 3.4.2S, when a VRF interface is configured, allows remote attackers to cause a denial of service (interface queue wedge and service outage) via crafted RSVP packets, aka Bug ID CSCts80643. Cisco IOS is a popular Internet operating system. This vulnerability allows unauthenticated remote attackers to cause link loss on the interface, routing protocol adjacency Lost and other denial of service conditions. \nSuccessful exploits will result in a denial-of-service condition. \nThis issue is being tracked by Cisco Bug ID CSCts80643. ----------------------------------------------------------------------\n\nBecome a PSI 3.0 beta tester!\nTest-drive the new beta version and tell us what you think about its extended automatic update function and significantly enhanced user-interface. \nDownload it here!\nhttp://secunia.com/psi_30_beta_launch\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS RSVP Denial of Service Vulnerability\n\nSECUNIA ADVISORY ID:\nSA48611\n\nVERIFY ADVISORY:\nSecunia.com\nhttp://secunia.com/advisories/48611/\nCustomer Area (Credentials Required)\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=48611\n\nRELEASE DATE:\n2012-03-29\n\nDISCUSS ADVISORY:\nhttp://secunia.com/advisories/48611/#comments\n\nAVAILABLE ON SITE AND IN CUSTOMER AREA:\n * Last Update\n * Popularity\n * Comments\n * Criticality Level\n * Impact\n * Where\n * Solution Status\n * Operating System / Software\n * CVE Reference(s)\n\nhttp://secunia.com/advisories/48611/\n\nONLY AVAILABLE IN CUSTOMER AREA:\n * Authentication Level\n * Report Reliability\n * Secunia PoC\n * Secunia Analysis\n * Systems Affected\n * Approve Distribution\n * Remediation Status\n * Secunia CVSS Score\n * CVSS\n\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=48611\n\nONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:\n * AUTOMATED SCANNING\n\nhttp://secunia.com/vulnerability_scanning/personal/\nhttp://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/\n\nDESCRIPTION:\nA vulnerability has been reported in Cisco IOS, which can be\nexploited by malicious people to cause a DoS (Denial of Service). \n\nThe vulnerability is caused due to an error in the RSVP feature and\ncan be exploited to e.g. cause a loss in connectivity via crafted\nRSVP packets. \n\nPlease see the vendor\u0027s advisory for a list of affected versions. \n\nSOLUTION:\nUpdate to a fixed version (please see the vendor\u0027s advisory for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\nhttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n. \n\nFor more information:\nSA48611\n\nThe vulnerability is reported in versions 3.2.xS and 3.3.xS. This vulnerability\ncould be exploited repeatedly to cause an extended DoS condition. \n\nA workaround is available to mitigate this vulnerability. \n\nCisco has released free software updates that address this\nvulnerability. This advisory is available at the following link: \nhttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp\n\n\nNote: The March 28, 2012, Cisco IOS Software Security Advisory\nbundled publication includes nine Cisco Security Advisories. Each\nadvisory lists the Cisco IOS Software releases that correct the\nvulnerability or vulnerabilities detailed in the advisory as well as\nthe Cisco IOS Software releases that correct all vulnerabilities in\nthe March 2012 bundled publication. \n\nIndividual publication links are in \"Cisco Event Response:\nSemi-Annual Cisco IOS Software Security Advisory Bundled Publication\"\nat the following link:\n\nhttp://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html\n\n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nOnly devices with specific configurations are affected. A device is vulnerable if both the\nfollowing criteria are met:\n\n * At least one VRF is configured without RSVP\n * At least one other interface (physical or virtual), not in the\n same VRF, is configured with RSVP\n\nSome example scenarios are as follows:\n\n * RSVP-Traffic Engineering (RSVP-TE) in Multiprotocol Label\n Switching (MPLS) infrastructures\n * Multi-VRF infrastructures\n * VRF-Lite infrastructures\n\nTo determine the Cisco IOS Software release that is running on a\nCisco product, administrators can log in to the device and issue the \nshow version command to display the system banner. Other\nCisco devices do not have the show version command or may provide\ndifferent output. \n\nThe following example identifies a Cisco product that is running\nCisco IOS Software Release 15.0(1)M1 with an installed image name of\nC3900-UNIVERSALK9-M:\n\nRouter\u003e show version \nCisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)\nTechnical Support: http://www.cisco.com/techsupport \nCopyright (c) 1986-2009 by Cisco Systems, Inc. \nCompiled Wed 02-Dec-09 17:17 by prod_rel_team\n!--- output truncated \n\nAdditional information about Cisco IOS Software release naming\nconventions is available in \"White Paper: Cisco IOS and NX-OS\nSoftware Reference Guide\" at:\nhttp://www.cisco.com/web/about/security/intelligence/ios-ref.html\n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nCisco IOS-XR software is not affected by this vulnerability. \n\nNo other Cisco products are currently known to be affected by this\nvulnerability. This vulnerability\ncould be exploited repeatedly to cause an extended DoS condition. \n\nA device is vulnerable if it is configured with VRF and none of the\ninterfaces in that VRF have RSVP enabled, but any other interface\n(physical or virtual) does have RSVP enabled. \n\nAn attacker with some knowledge of the affected infrastructure\ncould exploit this vulnerability by sending RSVP packets to\nvulnerable devices. \n\nA workaround is available to mitigate this vulnerability. \n\nIn devices that meet the vulnerable configuration criteria, valid\nRSVP packets could trigger this vulnerability. An attacker with\nknowledge of the infrastructure could craft valid RSVP packets with\nset conditions to exploit this vulnerability. Recovery from this\ninterface queue wedge requires a reload of the device. \n\nFor more information about queue wedges and a few detection\nmechanisms that may be used to identify a blocked interface on Cisco\nIOS Software (including a white paper describing how this condition\ncan be detected using SNMP) see:\nhttp://blogs.cisco.com/security/comments/cisco_ios_queue_wedges_explained\n\nThis vulnerability has been documented in Cisco bug ID CSCts80643\nand has been assigned the Common Vulnerabilities and Exposures (CVE) \nID CVE-2012-1311. \n\nVulnerability Scoring Details\n=============================\n\nCisco has scored the vulnerability in this advisory based on the\nCommon Vulnerability Scoring System (CVSS). The CVSS scoring in this\nsecurity advisory is in accordance with CVSS version 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps organizations determine the urgency and priority\nof a response. \n\nCisco has provided a base and temporal score. Customers can also\ncompute environmental scores that help determine the impact of the\nvulnerability in their own networks. \n\nCisco has provided additional information regarding CVSS at the\nfollowing link:\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to compute the\nenvironmental impact for individual networks at the following link:\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\n* CSCts80643 - Cisco IOS Software RSVP Denial of Service Vulnerability\n\n\nCVSS Base Score - 7.8\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\nImpact\n======\n\nSuccessful exploitation of this vulnerability will result in an\ninterface queue wedge, which can lead to loss of connectivity, loss\nof routing protocol adjacency, and other DoS conditions. This\nvulnerability could be exploited repeatedly to cause an extended DoS\ncondition. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, customers are advised to consult\nthe Cisco Security Advisories and Responses archive at:\nhttp://www.cisco.com/go/psirt and review subsequent advisories to \ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should ensure that the devices to be upgraded\ncontain sufficient memory and confirm that current hardware and\nsoftware configurations will continue to be supported properly by the\nnew release. If the information is not clear, customers are advised\nto contact the Cisco Technical Assistance Center (TAC) or their\ncontracted maintenance providers. If a particular train is vulnerable, the\nearliest releases that contain the fix are listed in the First Fixed\nRelease column. The First Fixed Release for All Advisories in the\nMarch 2012 Bundled Publication column lists the earliest possible\nreleases that correct all the published vulnerabilities in the Cisco\nIOS Software Security Advisory bundled publication. Cisco recommends\nupgrading to the latest available release, where possible. This tool is available on the Cisco Security Intelligence\nOperations (SIO) portal at:\nhttp://tools.cisco.com/security/center/selectIOSVersion.x\n\n\n+--------------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|----------+---------------------------------------------------------|\n| Affected | |First Fixed Release for All |\n|12.0-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|--------------------------------------------------------------------|\n| There are no affected 12.0 based releases |\n|--------------------------------------------------------------------|\n| Affected | |First Fixed Release for All |\n|12.2-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|--------------------------------------------------------------------|\n| There are no affected 12.2 based releases |\n|--------------------------------------------------------------------|\n| Affected | |First Fixed Release for All |\n|12.3-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|--------------------------------------------------------------------|\n| There are no affected 12.3 based releases |\n|--------------------------------------------------------------------|\n| Affected | |First Fixed Release for All |\n|12.4-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|--------------------------------------------------------------------|\n| There are no affected 12.4 based releases |\n|--------------------------------------------------------------------|\n| Affected | |First Fixed Release for All |\n|15.0-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|----------+----------------------------+----------------------------|\n|15.0M |15.0(1)M8 |15.0(1)M8 |\n|----------+----------------------------+----------------------------|\n| | |Vulnerable; contact your |\n| | |support organization per the|\n|15.0MR |Not vulnerable |instructions in Obtaining |\n| | |Fixed Software section of |\n| | |this advisory. |\n|----------+----------------------------+----------------------------|\n| | |Vulnerable; contact your |\n| | |support organization per the|\n|15.0MRA |Not vulnerable |instructions in Obtaining |\n| | |Fixed Software section of |\n| | |this advisory. |\n|----------+----------------------------+----------------------------|\n| |Not vulnerable |15.0(1)S5 |\n|15.0S |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|\n| |see Cisco IOS XE Software |see Cisco IOS XE Software |\n| |Availability |Availability |\n|----------+----------------------------+----------------------------|\n|15.0SA |Not vulnerable |Not vulnerable |\n|----------+----------------------------+----------------------------|\n|15.0SE |Not vulnerable |15.0(1)SE1 |\n|----------+----------------------------+----------------------------|\n| |Not vulnerable |15.0(2)SG2 |\n|15.0SG |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|\n| |see Cisco IOS XE Software |see Cisco IOS XE Software |\n| |Availability |Availability |\n|----------+----------------------------+----------------------------|\n|15.0SY |15.0(1)SY1 |15.0(1)SY1 |\n|----------+----------------------------+----------------------------|\n|15.0XA |Vulnerable; First fixed in |Vulnerable; First fixed in |\n| |Release 15.1T |Release 15.1T |\n|----------+----------------------------+----------------------------|\n| |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|\n|15.0XO |see Cisco IOS XE Software |see Cisco IOS XE Software |\n| |Availability |Availability |\n|----------+----------------------------+----------------------------|\n| Affected | |First Fixed Release for All |\n|15.1-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|----------+----------------------------+----------------------------|\n|15.1EY |15.1(2)EY2 |15.1(2)EY2 |\n|----------+----------------------------+----------------------------|\n|15.1GC |15.1(2)GC2 |15.1(2)GC2 |\n|----------+----------------------------+----------------------------|\n|15.1M |15.1(4)M3 |15.1(4)M4; Available on |\n| |15.1(4)M3a |30-MAR-12 |\n|----------+----------------------------+----------------------------|\n| |Vulnerable; contact your |Vulnerable; contact your |\n| |support organization per the|support organization per the|\n|15.1MR |instructions in Obtaining |instructions in Obtaining |\n| |Fixed Software section of |Fixed Software section of |\n| |this advisory. |this advisory. |\n|----------+----------------------------+----------------------------|\n| |15.1(3)S2 |15.1(3)S2 |\n|15.1S |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|\n| |see Cisco IOS XE Software |see Cisco IOS XE Software |\n| |Availability |Availability |\n|----------+----------------------------+----------------------------|\n| |Not vulnerable |Not vulnerable |\n|15.1SG |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|\n| |see Cisco IOS XE Software |see Cisco IOS XE Software |\n| |Availability |Availability |\n|----------+----------------------------+----------------------------|\n| |Vulnerable; contact your |Vulnerable; contact your |\n| |support organization per the|support organization per the|\n|15.1SNG |instructions in Obtaining |instructions in Obtaining |\n| |Fixed Software section of |Fixed Software section of |\n| |this advisory. |this advisory. |\n|----------+----------------------------+----------------------------|\n|15.1SNH |Not vulnerable |Not vulnerable |\n|----------+----------------------------+----------------------------|\n| |15.1(1)T5; Available on | |\n| |18-MAY-12 | |\n|15.1T |15.1(2)T5; Available on |15.1(3)T3 |\n| |27-APR-12 | |\n| |15.1(3)T3 | |\n|----------+----------------------------+----------------------------|\n|15.1XB |Vulnerable; First fixed in |Vulnerable; First fixed in |\n| |Release 15.1T |Release 15.1T |\n|----------+----------------------------+----------------------------|\n| Affected | |First Fixed Release for All |\n|15.2-Based| First Fixed Release |Advisories in the March 2012|\n| Releases | |Cisco IOS Software Security |\n| | |Advisory Bundled Publication|\n|--------------------------------------------------------------------|\n| There are no affected 15.2 based releases |\n+--------------------------------------------------------------------+\n \n\nCisco IOS XE Software\n+--------------------\n\nCisco IOS XE Software is affected by the vulnerability that is\ndisclosed in this document. \n\n+---------------------------------------+\n| | | First Fixed |\n| | | Release for |\n| | | All |\n| Cisco | | Advisories |\n| IOS XE | First Fixed | in the March |\n| Software | Release | 2012 Cisco |\n| Release | | IOS Software |\n| | | Security |\n| | | Advisory |\n| | | Bundled |\n| | | Publication |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.1.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.2.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.3.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.4.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.5.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 2.6.x | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 3.1.xS | Not | migrate to |\n| | vulnerable | 3.4.2S or |\n| | | later. |\n|----------+-------------+--------------|\n| | | Vulnerable; |\n| 3.1xSG | Not | migrate to |\n| | vulnerable | 3.2.2SG or |\n| | | later. |\n|----------+-------------+--------------|\n| | Vulnerable; | Vulnerable; |\n| 3.2.xS | migrate to | migrate to |\n| | 3.4.2S or | 3.4.2S or |\n| | later. | later. |\n|----------+-------------+--------------|\n| 3.2xSG | Not | 3.2.2SG |\n| | vulnerable | |\n|----------+-------------+--------------|\n| | Vulnerable; | Vulnerable; |\n| 3.3.xS | migrate to | migrate to |\n| | 3.4.2S or | 3.4.2S or |\n| | later. | later. \n\n\nWorkarounds\n===========\n\nIt is possible to mitigate the vulnerability in this advisory by\napplying the global configuration command ip rsvp listener vrf \nvrf-name ip-address 0 0 announce, where the IP address is one that\ndoes not exist on the device or in the routing tables. \n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address the\nvulnerability described in this advisory. Prior to deploying\nsoftware, customers are advised to consult their maintenance\nproviders or check the software for feature set compatibility and\nknown issues that are specific to their environments. \n\nCustomers may only install and expect support for feature sets they\nhave purchased. By installing, downloading, accessing, or otherwise\nusing such software upgrades, customers agree to follow the terms of\nthe Cisco software license at:\nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html\nor as set forth at http://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, upgrades should be\nobtained through the Software Center on Cisco.com at http://www.cisco.com\n\nCustomers Using Third-Party Support Organizations\n+------------------------------------------------\n\nCustomers with Cisco products that are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers,\nshould contact that organization for assistance with the appropriate\ncourse of action. \n\nThe effectiveness of any workaround or fix depends on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Because of the variety of\naffected products and releases, customers should consult their\nservice providers or support organizations to ensure that any applied\nworkaround or fix is the most appropriate in the intended network\nbefore it is deployed. \n\nCustomers Without Service Contracts\n+----------------------------------\n\nCustomers who purchase directly from Cisco but do not hold a Cisco\nservice contract and customers who make purchases through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should obtain upgrades by contacting the Cisco\nTechnical Assistance Center (TAC):\n\n * +1 800 553 2447 (toll free from within North America)\n * +1 408 526 7209 (toll call from anywhere in the world)\n * e-mail: tac@cisco.com\n\nCustomers should have the product serial number available and be\nprepared to provide the URL of this advisory as evidence of\nentitlement to a free upgrade. Customers without service contracts\nshould request free upgrades through the TAC. \n\nRefer to Cisco Worldwide Contacts at:\nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html \nfor additional TAC contact information, including localized telephone \nnumbers, instructions, and e-mail addresses for support in various languages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco Product Security Incident Response Team (PSIRT) is not\naware of any public announcements or malicious use of the\nvulnerability that is described in this advisory. \n\nThis vulnerability was discovered by Cisco during internal testing. \n\nStatus of This Notice: Final\n+---------------------------\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\n\nDistribution\n============\n\nThis advisory is posted on the Cisco Security Intelligence Operations\nportal at the following link:\n\nhttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp\n\nAdditionally, a text version of this advisory is clear signed with\nthe Cisco PSIRT PGP key and circulated among the following e-mail\naddresses:\n\n * cust-security-announce@cisco.com\n * first-bulletins@lists.first.org\n * bugtraq@securityfocus.com\n * vulnwatch@vulnwatch.org\n * cisco@spot.colorado.edu\n * cisco-nsp@puck.nether.net\n * full-disclosure@lists.grok.org.uk\n\nFuture updates of this advisory, if any, will reside on Cisco.com but\nmay not be announced on mailing lists. Users can monitor this\nadvisory\u0027s URL for any updates. \n\n\nRevision History\n================\n\n+---------------------------------------+\n| Revision | | Initial |\n| 1.0 | 2012-March-28 | public |\n| | | release |\n+---------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information about reporting security vulnerabilities in\nCisco products, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco is available\non Cisco.com at:\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis web page includes instructions for press inquiries regarding Cisco \nSecurity Advisories. \n\nAll Cisco Security Advisories are available at:\nhttp://www.cisco.com/go/psirt\n\n\n+--------------------------------------------------------------------\nCopyright 2010-2012 Cisco Systems, Inc. All rights reserved. \n+--------------------------------------------------------------------\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG/MacGPG2 v2.0.17 (Darwin)\nComment: GPGTools - http://gpgtools.org\n\niF4EAREIAAYFAk9zJcsACgkQQXnnBKKRMNDH1QD/fcj0Kk+JmG8NAI53aDniH5yk\nEfxvebH1J/HGmUcEuFAA/RMKnbZ81Zx39c2hJe7iuaeRZnglJVFbsZyIPvZZrOSU\n=HBKt\n-----END PGP SIGNATURE-----\n",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.