TippingPoint Zero Day Initiative

RealNetworks RealPlayer GIF Handling Remote Code Execution Vulnerability

ZDI-10-006: January 21st, 2010


CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to execute code on vulnerable installations of RealNetworks RealPlayer. User interaction is required in that a user must open a malicious file or visit a malicious web site.

The specific flaw exists during the parsing of GIF files with forged chunk sizes. The player uses values from the file improperly when allocating a buffer on the heap. An attacker can abuse this to create and then overflow heap buffers leading to arbitrary code execution in the context of the currently logged in user.

Vendor Response

RealNetworks has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2007-12-11 - Vulnerability reported to vendor
    2010-01-21 - Coordinated public release of advisory


This vulnerability was discovered by: