TippingPoint Zero Day Initiative

RealNetworks RealPlayer VIDOBJ_START_CODE Remote Code Execution Vulnerability

ZDI-12-048: March 22nd, 2012


CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

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

The flaw exists within dmp4.dll, specifically the decoding of an MPEG stream. When encountering a VIDOBJ_START_CODE object the process inproperly validates the size of the destination buffer used for rendering. The contents of a decoded frame are copied to this region which can result in heap corruption if the decoded frame size exceeds the size of this region. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the process.

Vendor Response

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

Disclosure Timeline

    2011-10-21 - Vulnerability reported to vendor
    2012-03-22 - Coordinated public release of advisory


This vulnerability was discovered by:
    Luigi Auriemma