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Security Services

RealNetworks RealPlayer Memory Corruption Vulnerability



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


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

The vulnerability specifically exists in the way RealPlayer handles specially crafted RealMedia video files.

When processing specially crafted RealMedia files, RealPlayer uses a value from the file to control a loop operation. Realplayer fails to validate the value before using it, which leads to heap memory corruption and an exploitable condition.


Successful exploitation could allow attackers to execute arbitrary code in the context of the current 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.


Windows RealPlayer SP 1.1.4 and prior and Linux RealPlayer and prior are vulnerable.


iDefense is currently unaware of any workarounds for this issue.


RealNetworks has released a patch which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-4386 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


04/14/2010 Initial Contact
04/14/2010 Initial Response
12/10/2010 Coordinated public disclosure


This vulnerability was reported to iDefense by Omair.

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Copyright © 2010 Verisign, Inc.

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