Check Point Advisories

Digium Asterisk SIP Terminated Channel ACK with SDP Denial of Service (CVE-2013-5641)

Check Point Reference: CPAI-2013-3492
Date Published: 27 Oct 2013
Severity: Critical
Last Updated: Saturday 04 January, 2025
Source: CVE-2013-5641
Protection Provided by:

Security Gateway
R75
Who is Vulnerable? Digium Asterisk Open Source Prior to 1.8.23.1
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 and Certified Asterisk.
Vulnerability DetailsThe 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 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

  1. In the IPS tab, click Protections and find the Digium Asterisk SIP Terminated Channel ACK with SDP Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: VoIP Enforcement Violation
Attack Information: Digium Asterisk SIP Terminated Channel ACK with SDP Denial of Service

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