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RealNetworks RealPlayer RVRENDER Heap Buffer Overflow Vulnerability

11.18.11

BACKGROUND

RealPlayer is RealNetworks's media player product used to render video and other media. For more information, visit:

http://www.real.com.

DESCRIPTION

Remote exploitation of a heap buffer overflow vulnerability in RealNetworks Inc.'s RealPlayer media player could allow attackers to execute arbitrary code in the context of the targeted user.

The vulnerability is due to the way RealPlayer handles specially crafted RealMedia files using the RealVideo Renderer plugin. A short value is read directly from a .ram media file. This value is used to calculate a length value which is passed to a memory copy operation as the size parameter. This can cause the memory copy operation to overflow the bounds of a fixed-sized heap buffer. This condition may lead to arbitrary code execution.

ANALYSIS

Successful exploitation could allow attackers to execute arbitrary code in the context of the currently logged-on user. To exploit this vulnerability, an attacker must persuade a victim into using RealPlayer to open a specially crafted media file. This could be accomplished by either direct link or referenced from a website under the attacker's control. An attacker could host a Web page containing a malformed file. Upon visiting the malicious Web page, exploitation would occur and execution of arbitrary code would be possible. Alternatively a malicious media file could be attached within an e-mail file.

DETECTION

The following versions of RealPlayer are vulnerable:

  • RealPlayer 11.0 - 11.1
  • RealPlayer SP 1.0 - 1.1.5
  • RealPlayer 14.0.0 - 14.0.7

WORKAROUND

iDefense is currently unaware of any workaround for this issue.

VENDOR RESPONSE

RealNetworks has released patches and workarounds to address this vulnerability. For more information, consult their advisory at the following URL.

http://service.real.com/realplayer/security/11182011_player/en/

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-4244 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

06/15/2011 Initial Vendor Notification
06/15/2011 Initial Vendor Reply
11/18/2011 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Omair.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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 customer service 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.