Check Point Advisories

RealNetworks Helix Server RTSP DESCRIBE Heap Buffer Overflow (CVE-2008-5911)

Check Point Reference: CPAI-2008-392
Date Published: 15 Feb 2010
Severity: High
Last Updated: Monday 15 February, 2010
Source:
Industry Reference:CVE-2008-5911
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Helix Server is a multi-media server that is designed to serve streaming and static audio and video content. Helix project, Helix Server being part of it, is intended as a largely free software/open source digital media framework that runs on numerous operating systems and processors (including mobile phones). The project was started by RealNetworks which has contributed much of the code. There exists a buffer overflow vulnerability in the way RealNetworks Helix Server handles RTSP requests. Remote unauthenticated attackers can exploit this vulnerability by sending a malicious RTSP request to the affected server. As a result of processing the malicious command, a heap-based buffer overflow can be triggered which may result in injection and execution of arbitrary code. In the case of an attack, where code injection is unsuccessful, the Helix Server service will terminate, and all the connected sessions will be closed immediately. Furthermore, the functionality of all the services that depend on the vulnerable service might be affected as well. In a case where code injection is successful, the behavior of the system will be entirely dependent on the nature of the injected code. Any code executed will be with the the security privileges of the vulnerable service, normally System.

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 RealNetworks Helix Server RTSP DESCRIBE Heap Buffer Overflow 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:  RTSP Enforcement Violation.
Attack Information:  RealNetworks Helix Server RTSP DESCRIBE heap buffer overflow

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