Cisco Security Advisory: Cisco IOS Software Queue Wedge Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt () cisco com>]

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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
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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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