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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
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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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