Check Point Advisories

Digium Asterisk Skinny Channel NULL-Pointer Dereference (CVE-2012-2948)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-302
Date Published:	27 Aug 2012
Severity:	High
Last Updated:	Wednesday 29 April, 2015
Source:
Industry Reference:	CVE-2012-2948
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in Digium Asterisk. The vulnerability is due to a NULL-pointer dereference error while handling a closed client connection in the SCCP (Skinny) channel driver. A remote attacker can exploit this vulnerability by closing a connection to the Asterisk server in certain call states. The attacker will have to use a valid SCCP ID to close the connection. Successful exploitation would cause the server to crash, resulting in a denial of service condition.

Protection Overview

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.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Digium Asterisk Skinny Channel NULL-Pointer Dereference protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: VoIP Enforcement Violation.
Attack Information: Digium Asterisk Skinny Channel NULL-Pointer Dereference