Check Point Advisories

Digium Asterisk Invalid RTP Payload Type Number Memory Corruption (CVE-2008-1289)

Check Point Reference: CPAI-2008-272
Date Published: 10 Feb 2010
Severity: Critical
Last Updated: Wednesday 10 February, 2010
Source:
Industry Reference:CVE-2008-1289
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 memory corruption vulnerability in Digium Asterisk product. The vulnerability is due to an insufficient validation of user-supplied data in the Session Description Protocol (SDP) payload. The vulnerability can be exploited by remote unauthenticated attackers by sending a request containing a malicious value in the payload. Successful exploitation of this vulnerability may allow an attacker to corrupt memory and cause denial-of-service condition, or possibly execute arbitrary code in the context of the affected service. In case of an attack where code injection is successful, the behavior of the affected service will depend on the intended function of the injected code. Any code injected would run in the privileges of the service. In case of an attack where code injection is not successful, the service will terminate, 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 Invalid RTP Payload Type Number Memory Corruption 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 invalid RTP payload type number memory corruption

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