Check Point Advisories

Digium Asterisk SIP Invalid SDP Media Descriptions Denial of Service (CVE-2013-5642)

Vulnerability
Protection

Check Point Reference:	CPAI-2013-2961
Date Published:	27 Oct 2013
Severity:	High
Last Updated:	Saturday 04 January, 2025
Source:	CVE-2013-5642
Protection Provided by:	Security Gateway R75
Who is Vulnerable?	Digium Asterisk Digiumphones Prior to 10.12.3-digiumphones Digium Asterisk Open Source Prior to 1.8.23.1 Digium Asterisk Open Source Prior to 10.12.3 Digium Asterisk Open Source Prior to 11.5.1 Digium Certified Asterisk Prior to 1.8.15-cert3 Digium Certified Asterisk Prior to 11.2-cert2
Vulnerability Description	A denial of service vulnerability exists in Asterisk Open Source, Certified Asterisk and Asterisk with Digiumphones.
Vulnerability Details	The vulnerability is due to the SIP channel driver failing to handle an invalid SDP sent in a SIP request that defines media descriptions before connection information. An attacker could exploit this vulnerability by sending a specially crafted SIP request to the vulnerable server. Successful exploitation would result in the 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 product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

Security Gateway R75 / R71 / R70

In the IPS tab, click Protections and find the Digium Asterisk SIP Invalid SDP Media Descriptions Denial of Service protection using the Search tool and Edit the protection's settings.
Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: VoIP Enforcement Violation
Attack Information: Digium Asterisk SIP Invalid SDP Media Descriptions Denial of Service