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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2738
      Cisco ASR 5500 SAE Gateway BGP Denial of Service Vulnerability
                              3 November 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco ASR 5500 SAE Gateway
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-6351  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151028-asr

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Cisco Security Advisory

Cisco ASR 5500 SAE Gateway BGP Denial of Service Vulnerability

Medium

Advisory ID: cisco-sa-20151028-asr

Published: 2015 October 28 20:58 GMT

Version 1.0: Final

CVSS Score:

Base - 5.0

Workarounds:

Yes

Cisco Bug IDs:

CSCuw65781

CVE-2015-6351

CWE-20

Summary

A vulnerability in the Border Gateway Protocol (BGP) input packet handler in 
the Cisco ASR 5500 System Architecture Evolution (SAE) Gateway could allow an
unauthenticated, remote attacker to cause a partial denial of service (DoS) 
condition because the BGP process restarts unexpectedly.

The vulnerability is due to lack of proper input validation of the BGP packet
header. An attacker could exploit this vulnerability by sending a crafted BGP
packet to the affected device. An exploit could allow the attacker to cause a
partial DoS condition because the BGP process restarts unexpectedly.

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-20151028-asr

Affected Products

Vulnerable Products

Cisco ASR 5500 SAE Gateway running Cisco ASR 5000 Series Software Release 
19.1.0.61559 or 19.2.0 is vulnerable.

Products Confirmed Not Vulnerable

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

Indicators of Compromise

The Cisco ASR 500 SAE Gateway will write a core file for the bgp process. This
can be viewed using the command-line interface command show crash. Contact the
Cisco Technical Assistance Center (TAC) to review the core file and confirm 
whether the core file shows that the device has been compromised by this 
vulnerability.

Workarounds

Administrators may consider removing the BGP configuration from affected 
devices.

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-20151028-asr

Revision History

Version  Description              Section  Status  Date
1.0      Initial public release.  NA       Final   2015-October-28

Legal Disclaimer

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 standalone copy or paraphrase of the text of this document that omits the 
distribution URL is an uncontrolled copy, and may lack important information 
or contain factual errors. The information in this document is intended for 
end users of Cisco products.

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