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RealNetworks RealPlayer RealAudio Codec 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 files using RealAudio codec.

When decoding an audio stream in a specially crafted RealMedia file, RealPlayer uses a value from the file without properly validating 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 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.


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


iDefense is currently unaware of any workaround 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-2010-4387 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


05/12/2010 Initial Contact
05/12/2010 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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