iDefense Security Advisory 03.31.10 http://labs.idefense.com/intelligence/vulnerabilities/ Mar 31, 2010 I. BACKGROUND Helix DNA Server is software that can play audio and video media in various formats and stream them over a network. It is intended as a largely free and open source digital media framework that runs on numerous operating systems. The Helix DNA Server can support various formats including RealVideo, RealAudio, and MP3. II. DESCRIPTION Remote exploitation of a stack buffer overflow vulnerability in RealNetworks Inc.'s Helix DNA Server could allow an attacker to execute arbitrary code with the privileges of the affected service.

The Helix DNA Server contains a vulnerability that can be triggered by an unauthenticated attacker. The vulnerability results due to the parsing of a certain type of Real Time Streaming Protocol (RTSP) request specifying a large string. The vulnerable function may perform a copy operation that results in the bounds of a stack buffer to be overflown. III. ANALYSIS Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service. In order to exploit this vulnerability, an attacker needs to be able to create a TCP connection to port 554 on the targeted server. No authentication is required. IV. DETECTION Helix Server and Helix Mobile Server versions 12.x, 13.x and 14.x are vulnerable. V. WORKAROUND iDefense is currently unaware of any workarounds for this issue. VI. VENDOR RESPONSE RealNetworks has released a patch which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown. http://docs.real.com/docs/security/SecurityUpdate033111HS.pdf VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-4596 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 11/17/2010 Initial Contact 12/03/2010 Initial Response 03/31/2010 Coordinated public disclosure. IX. CREDIT This vulnerability was reported to iDefense by defrost. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2011 Verisign Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.