Cisco Gigabit Switch Router 12000 Series Routers Denial of Service Vulnerability

Summary

• A vulnerability in the ASIC UDP ingress receive function of Cisco Gigabit Switch Router (GSR) 12000 Series Routers could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition when one line card in the router unexpectedly restarts.
  
  The vulnerability is due to improper input validation for the presence of a Bidirectional Forwarding Detection (BFD) header on the UDP packet. An attacker could exploit this vulnerability by sending a crafted UDP packet with a specific UDP port range to the affected device. An exploit could allow the attacker to cause a partial denial of service condition when a line card unexpectedly restarts.
  
  Cisco has released software updates that address this vulnerability. Workarounds that address this vulnerability are available.
  
  This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160311-gsr

Affected Products

• Vulnerable Products

  All releases of Cisco IOS XR for Cisco GSR 12000 Series Routers are vulnerable.

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.

Workarounds

• An access-control list (ACL) can be applied to the incoming interface to block the offending packets.

Fixed Software

• Information about fixed software is documented in the Cisco bugs, which are accessible through the Cisco Bug Search Tool.
  
  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.

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.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160311-gsr

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2016-March-11

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