Check Point Advisories

Digium Asterisk SIP Invalid Response Code Denial of Service (CVE-2007-1594)

Check Point Reference: CPAI-2007-248
Date Published: 18 Oct 2009
Severity: Medium
Last Updated: Sunday 18 October, 2009
Source:
Industry Reference:CVE-2007-1594
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Asterisk is an open source software implementation of a telephone private branch exchange. Like any PBX, it allows a number of attached telephones to make calls to one another, and to connect to other telephone services including the public switched telephone network. Asterisk supports a wide range of Voice over IP protocols, including SIP, MGCP, and H.323. There exists a Null-dereference vulnerability in the way Digium Asterisk handles SIP response messages. The vulnerability is due to errors occurred while handling invalid SIP Response Status-Code in SIP Channel Driver component. Remote authenticated attackers can exploit this vulnerability by sending crafted SIP response messages to the target server. Successful exploitation of this vulnerability results in the Denial of Service condition on the target server. Upon a successful attack, the vulnerable Asterisk server will terminate and exit, creating a denial of service condition. The service needs to be restarted manually to restore the functionality.

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 Invalid Response Code 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 SIP invalid response code denial of service

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