Check Point Advisories

RealNetworks Helix Server RTSP SETUP Stack Buffer Overflow (CVE-2008-5911)

Vulnerability
Protection

Check Point Reference:	CPAI-2009-353
Date Published:	13 Oct 2009
Severity:	High
Last Updated:	Sunday 20 July, 2014
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). There exists a buffer overflow vulnerability in the way RealNetworks Helix Server handles RTSP requests. Remote unauthenticated attackers can exploit this vulnerability by sending malicious RTSP SETUP requests to the affected server. As a result of processing the malicious command, a stack-based buffer overflow can be triggered which may result in injection and execution of arbitrary code within the security privileges of the vulnerable service on the target system, normally System. In 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 case of an attack where code injection is successful, the behaviour of the system will be entirely dependent on the intended purpose 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

In the IPS tab, click Protections and find the RealNetworks Helix Server RTSP SETUP Stack Buffer Overflow protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Media Player Enforcement Violation.
Attack Information: RealNetworks Helix server RTSP SETUP stack buffer overflow