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

SYNTHESIS OF THE VULNERABILITY

An attacker can send special SIP packets to Cisco IOS, in order to
trigger a denial of service.

Impacted products: IOS, Cisco Router xx00 Series

Severity: 2/4

Creation date: 06/11/2013

DESCRIPTION OF THE VULNERABILITY

The Cisco IOS system can process SIP messages.

However, specific messages targeting the router trigger a memory
leak or a reload. Technical details are unknown.

An attacker can therefore send special SIP packets to Cisco IOS,
in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Cisco-IOS-denial-of-service-via-SIP-13716