Check Point Advisories

Digium Asterisk SIP Terminated Channel ACK with SDP denial of service - ver 2 (CVE-2013-5641)

Check Point Reference: CPAI-2013-3492
Date Published: 20 Oct 2013
Severity: Critical
Last Updated: Monday 19 January, 2015
Source:
Industry Reference:CVE-2013-5641
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description A denial of service vulnerability exists in Asterisk Open Source and Certified Asterisk.
The vulnerability is due to the SIP channel driver failing to properly handle an ACK with SDP received after the channel has been terminated.
A remote attacker could exploit this vulnerability by sending a delayed ACK request with SDP to the vulnerable server.
Successful exploitation would result 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

  1. In the IPS tab, click Protections and find the Digium Asterisk SIP Terminated Channel ACK with SDP denial of service - ver 2 protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  VoIP Enforcement Violation.
Attack Information:  Digium Asterisk SIP Terminated Channel ACK with SDP denial of service - ver 2

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