-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

+------------------------------------------------------------------------------

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.

-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - http://gpgtools.org

iQIcBAEBCAAGBQJX6vstAAoJEK89gD3EAJB56nIP/3nkibZCUPqC2Aki8HhkABUi
CsKrKk/a/eG1Y+4yGM2pFIfUwVXUX8cjIus14c418CxuePCNZf/u8WcNcKnd+QNa
WahXGn2krIlas7g8kJP8Pvk8nVyxYF10nR8MPQDjCyGXmuAbRdkuPUjEopDkMr4R
xabgu/jL7M+ZEfnwbGZRhq3jMBiHxKhOSZO3qDZYKOMB3KALQBPL4GiRGO1eHrzs
F6ZE6/l4d5GvtiSeD8WJ1A8oY3gSo6qD7VZcnDq3ZvHN2Elnc9WRs28CN70eh+xz
VQDN7+Vm2GqvRgRSGtypk7vLmaeUnZEXQ5jpJHQFgTnp7n4elVH4dC2DmF1bYd/m
M220xbScBKvVjjUihQechgTsINwkBbARAnuTlN+IL/2FQqF+XEmSMLzEgvTMD/gn
aNk48i8Vx2nAPd8lzi5Ab2mvX14ss/tonnz6behCd5uqKU0UZ18bUEqc2haYAAM4
iWiE4K4SqorOHZwcpWSsJ7Vs72wmXRYnxzD2A2meTskyLQo5cJP6eqkK7Tadqf18
ao3Ao4hdVbkRVEMnhG9N1oVB5X9GAIsUMfeWEA/nKuomLLO37NgDEc8Rg278W6og
SH75yARDeViyDQg7+AlZnlJlB82+ORgMlsJFBUD3hKhCQYX4Ou3GU5BccPxY4KAQ
oWNuau9ap2FXdMVrW4gl
=Ku7Q
-----END PGP SIGNATURE-----