|Check Point Reference:||CPAI-2007-246|
|Date Published:||20 Dec 2009|
|Last Updated:||16 Oct 2017|
|Protection Provided by:||
|Who is Vulnerable?|
|Vulnerability Description||There exists a denial of service vulnerability in Cisco's IP phone models 7960 and 7940. The affected firmware cannot handle a specially crafted SIP INVITE message with an invalid IP address, causing the phone to reboot upon receiving the message. As a result, a remote user can cause a denial of service condition to IP phone service. In case of an attack, where a remote uesr sends a specially crafted SIP packet, the Cisco device running the SIP firmware will be forced to reload. The Cisco device will be unavailable for the several minutes it takes to reload. Repeated attacks could create a continuous denial of service condition.|
This protection will detect and block attempts to exploit this vulnerability.
In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.
This protection's log will contain the following information:
Attack Name: VoIP Enforcement Violation.
Attack Information: Cisco IP Phone SIP INVITE Message Denial of Service