[Full-disclosure] Cisco Security Advisory: Cisco IOS Software Internet Key Exchange Memory Leak Vulnerability

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

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Cisco IOS Software Internet Key Exchange Memory Leak Vulnerability

Advisory ID: cisco-sa-20130925-ike

Revision 1.0

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

A vulnerability in the Internet Key Exchange (IKE) protocol of Cisco IOS 
Software and Cisco IOS XE Software could allow an unauthenticated, remote 
attacker to cause a memory leak that could lead to a device reload.

The vulnerability is due to incorrect handling of malformed IKE packets by the 
affected software. An attacker could exploit this vulnerability by sending 
crafted IKE packets to a device configured with features that leverage IKE 
version 1 (IKEv1).

Although IKEv1 is automatically enabled on a Cisco IOS Software and Cisco IOS 
XE Software when IKEv1 or IKE version 2 (IKEv2) is configured, the 
vulnerability can be triggered only by sending a malformed IKEv1 packet.

In specific conditions, normal IKEv1 packets can also cause an affected release 
of Cisco IOS Software to leak memory.

Only IKEv1 is affected by this vulnerability.

An exploit could cause Cisco IOS Software not to release allocated memory, 
causing a memory leak. A sustained attack may result in a device reload.

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

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

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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