TippingPoint Zero Day Initiative

RealNetworks RealPlayer RMX Header Remote Code Execution Vulnerability

ZDI-10-281: December 10th, 2010


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10723. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of RealNetworks RealPlayer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the applications support for parsing the RMX file format. When parsing the format, the application will explicitly trust 32-bits in a field used in the header for the allocation of an array. This can cause a buffer to be under-allocated and will cause a buffer overflow when initializing the array. This can lead to code execution under the context of the application.

Vendor Response

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

Disclosure Timeline

    2010-08-25 - Vulnerability reported to vendor
    2010-12-10 - Coordinated public release of advisory


This vulnerability was discovered by:
    Sebastian Apelt (www.siberas.de)