Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Border Gateway Protocol (BGP) code of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the affected device to reload.
The vulnerability is due to an issue with the regex engine used when processing complex regular expressions. An attacker could exploit this vulnerability by injecting specific autonomous system (AS) path sets. If the affected device has a complex regular expression applied to the inbound routes, the vulnerability may be triggered. An exploit could allow the attacker to trigger Cisco NX-OS Software to restart.
Cisco has confirmed the vulnerability in a security notice and released software updates.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCuf49554 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco NX-OS Software versions 6.1(3) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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 Release NA Final 2013-Sep-17
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