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Cisco Security Advisory 20130925-ipv6vfr

Cisco Security Advisory 20130925-ipv6vfr
Posted Sep 25, 2013
Authored by Cisco Systems | Site cisco.com

Cisco Security Advisory - 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.

tags | advisory, remote, denial of service
systems | cisco, ios
SHA-256 | 8f713408f5485ebe4bd2af72fa2c6d1a787b587c82d2bf30400c3e25715d78b1

Cisco Security Advisory 20130925-ipv6vfr

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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)
- ----------------------------------------------------------------------

Summary
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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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