[Full-disclosure] Cisco Security Advisory: Cisco IOS Software IPv6 Virtual Fragmentation Reassembly Denial of Service Vulnerability

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

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Cisco IOS Software IPv6 Virtual Fragmentation Reassembly Denial of Service 
Vulnerability

Advisory ID: cisco-sa-20130925-ipv6vfr

Revision 1.0

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

A vulnerability in the implementation of the virtual fragmentation reassembly 
(VFR) feature for IP version 6 (IPv6) in Cisco IOS Software could allow an 
unauthenticated, remote attacker to cause an affected device to hang or reload, 
resulting in a denial of service (DoS) condition.

The vulnerability is due to a race condition while accessing the reassembly 
queue for IPv6 fragments. An attacker could exploit this vulnerability by 
sending a crafted stream of valid IPv6 fragments. Repeated exploitation may 
result in a sustained DoS condition.

Cisco has released free software updates that address this vulnerability. There 
are no workarounds for this vulnerability.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ipv6vfr

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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