[Full-disclosure] Cisco Security Advisory: Cisco IOS Software Queue Wedge Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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Cisco IOS Software Queue Wedge Denial of Service Vulnerability

Advisory ID: cisco-sa-20130925-wedge

Revision 1.0

For Public Release 2013 September 25 16:00  UTC (GMT)
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Summary
=======

A vulnerability in the T1/E1 driver queue implementation of Cisco IOS Software 
could allow an unauthenticated, remote attacker to cause an interface wedge 
condition, which could lead to loss of connectivity, loss of routing protocol 
adjacency, and could result in a denial of service (DoS) scenario.

The vulnerability is due to incorrect implementation of the T1/E1 driver queue. 
An attacker could exploit this vulnerability by sending bursty traffic through 
the affected interface driver. Repeated exploitation could cause a DoS 
condition.

Workarounds to mitigate this vulnerability are available.

Cisco has released free software updates that address this vulnerability. This 
advisory is available at the following link:  
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-wedge

Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled 
publication includes eight Cisco Security Advisories. All advisories address 
vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 
Advisory lists the Cisco IOS Software releases that correct the vulnerability 
or vulnerabilities detailed in the advisory as well as the Cisco IOS Software 
releases that correct all Cisco IOS Software vulnerabilities in the September 
2013 bundled publication.

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS 
Software Security Advisory Bundled Publication" at the following link: 
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep13.html
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