Check Point Advisories

Digium Asterisk PJSIP Channel Driver REGISTER Denial of Service

Check Point Reference: CPAI-2016-0521
Date Published: 17 Jul 2016
Severity: Medium
Last Updated: Monday 10 October, 2016
Source: Digium AST-2016-004
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Digium Asterisk Open Source 13.x
Digium Certified Asterisk 13.1
Vulnerability Description A denial of service vulnerability exists in Digium Asterisk. The vulnerability is due to errors when processing incoming REGISTER requests with lengthy Contact Header URI. A remote authenticated attacker can exploit this vulnerability to cause 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 PJSIP Channel Driver REGISTER 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 Channel Driver REGISTER Denial of Service

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