Check Point Advisories

Digium Asterisk PJSIP Stack ACK Denial of Service

Check Point Reference: CPAI-2016-0938
Date Published: 26 Oct 2016
Severity: High
Last Updated: Tuesday 01 November, 2016
Source: Digium AST-2016-006
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Digium Asterisk Open Source 13.10
Vulnerability Description A denial of service vulnerability exists in Digium Asterisk when the PJSIP stack is used. The vulnerability is due to improper processing of ACKs from an unrecognized endpoint, that causes a NULL pointer dereference. A remote unauthenticated attacker can exploit this vulnerability by sending an ACK to the target server.

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 PJSIP Stack ACK Denial of Service 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 PJSIP Stack ACK Denial of Service

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