Check Point Advisories

Asterisk SIP Invite Malformed SDP Denial of Service (CVE-2007-1561)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-1221
Date Published:	18 Oct 2015
Severity:	High
Last Updated:	Wednesday 12 September, 2018
Source:
Industry Reference:	CVE-2007-1561
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Asterisk 1.2.17 and earlier Asterisk 1.4.x before 1.4.2
Vulnerability Description	A denial of service vulnerability exists in the channel driver of Asterisk. A remote attacker may send a SIP INVITE message with an SDP containing one valid and one invalid IP address, causing the server to crash.

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 Asterisk SIP Invite Malformed SDP Denial of Service 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: Asterisk SIP Invite Malformed SDP Denial of Service