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RealNetworks RealPlayer MLTI Stream Number Remote Code Execution Vulnerability

TPTI-10-19: December 10th, 2010


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10151. 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 RealPlayer's handling of Internet Video Recording (.ivr) files. While parsing the MLTI chunk the process trusts the field responsible for denoting the number of streams within the chunk. By modifying this value in an IVR file, an attacker can force a processing loop to overrun and corrupt heap memory. This can be abused to execute arbitrary code under the context of the user invoking RealPlayer.

Vendor Response

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

Disclosure Timeline

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


This vulnerability was discovered by: