Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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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
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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.
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Administrators may consider removing the BGP configuration from affected devices.
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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.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial public release. NA Final 2015-October-28
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