Cisco ASR 5000 CDMA PMIpv6 Denial of Service Vulnerability

Summary

• A vulnerability in the Proxy Mobile IPv6 (PMIPv6) protocol implementation of the Cisco Aggregation Services Router (ASR) ASR 5000 for Cisco Code Division Multiple Access (CDMA) System Software could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition due to the hamgr process restarting.
  
  The vulnerability is due to improper input validation of the PMIPv6 packet header. An attacker could exploit this vulnerability by sending a crafted PMIPv6 packet to the device. A successful exploit could allow the attacker to cause a partial DoS condition because the hamgr process could restart when parsing the crafted PMIPv6 packet.
  
  Cisco has released software updates that address this vulnerability. Workarounds that mitigate these vulnerabilities not are available.
  This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151016-asrcdma

Affected Products

• Vulnerable Products

  Cisco Aggregation Services Router (ASR) ASR 5000 version 19.0.MO.60737 for Cisco Code Division Multiple Access (CDMA) is vulnerable.

  Products Confirmed Not Vulnerable

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

Indicators of Compromise

• The ASR5K will write out a core file for the hamgr process. This can be viewed via the following Command Line Interface (CLI) command:

   
  # show crash <#>
  
  === ==================== ======== ========== =============== =======================
  
  #           Time         Process  Card/CPU/        SW          HW_SER_NUM
  
                                       PID         VERSION       MIO / Crash Card
  
  === ==================== ======== ========== =============== =======================
  
  1   2010-Feb-16+07:56:37 hamgr    05/0/15340 19.0.M0.61045   #######################
  

  
  Please contact the Cisco Technical Assistance Center (TAC) to review the core file and confirm if the core file shows that the device has been compromised by this vulnerability.

Workarounds

• Workarounds are not available.

Fixed Software

• When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
  

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-20151016-asrcdma

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2015-October-19

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