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Vigil@nce - Cisco IOS: denial of service via SIP NAT

April 2012 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can send SIP packets which are translated by Cisco
IOS, in order to generate a memory leak, leading to a denial of
service.

Severity: 2/4

Creation date: 28/03/2012

IMPACTED PRODUCTS

 Cisco Catalyst
 Cisco IOS
 Cisco Router

DESCRIPTION OF THE VULNERABILITY

Routers can translate (Network Address Translation) packets, in
order to change their addresses.

However, during the translation of SIP (Session Initiation
Protocol) packets, a memory area is never freed by the IOS.

An attacker can therefore send SIP packets which are translated by
Cisco IOS, in order to generate a memory leak, leading to a denial
of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Cisco-IOS-denial-of-service-via-SIP-NAT-11505


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