Cisco Security Advisory: Cisco IOS and IOS XE Software Internet Key Exchange Version 1 Fragmentation Denial of Service Vulnerability

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

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Cisco Security Advisory: Cisco IOS and IOS XE Software Internet Key Exchange 
Version 1 Fragmentation Denial of Service Vulnerability

Advisory ID:  cisco-sa-20160928-ios-ikev1

Revision: 1.0

For Public Release: 2016 September 28 16:00  GMT

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Summary
=======
A vulnerability in the Internet Key Exchange version 1 (IKEv1) fragmentation 
code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote 
attacker to cause an exhaustion of available memory or a reload of the affected 
system. 

The vulnerability is due to the improper handling of crafted, fragmented IKEv1 
packets. An attacker could exploit this vulnerability by sending crafted UDP 
packets to the affected system. An exploit could allow the attacker to cause a 
reload of the affected system.

Note: Only traffic directed to the affected system can be used to exploit this 
vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic.

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

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-ios-ikev1

This advisory is part of the September 28, 2016, release of the Cisco IOS and 
IOS XE Software Security Advisory Bundled Publication, which includes 10 Cisco 
Security Advisories that describe 11 vulnerabilities. All the vulnerabilities 
have a Security Impact Rating of High. For a complete list of the advisories 
and links to them, see Cisco Event Response: September 2016 Semiannual Cisco 
IOS and IOS XE Software Security Advisory Bundled Publication.

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