Check Point Advisories

RealNetworks Helix DNA Server RTSP Service Heap Overflow (CVE-2007-4561)

Check Point Reference: CPAI-2007-314
Date Published: 15 Oct 2009
Severity: Critical
Last Updated: 22 Jan 2017
Industry Reference:CVE-2007-4561
Protection Provided by:

Security Gateway
R80, R77, R76, R75

Who is Vulnerable?
Vulnerability Description Helix DNA Server is a multi-media server that is designed to serve streaming and static audio and video content. The open-source server is a counterpart to the RealNetworks' commercial streaming servers of the same nature. The server communicates using several protocols, which include RTSP, HTTP and MMS. 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 with crafted headers 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 on the target system. Any code execution will occur within the security privileges of the vulnerable service, normally the System. 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. The affected service must be started manually to resume the functionality. In the case where code injection was successful, the behaviour 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 / R76 / R75

  1. In the IPS tab, click Protections and find the RealNetworks Helix DNA Server RTSP Service Heap Overflow protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  Media Player Enforcement Violation
Attack Information:  RealNetworks Helix DNA server RTSP service heap overflow