TippingPoint Zero Day Initiative

RealNetworks RealPlayer RealAudio coded_frame_size Remote Code Execution

ZDI-12-049: 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 cook.dll, specifically the handling of a RealAudio 2.0 file. When parsing the RA2 header a coded_frame_sz element is used to calculate the size for an allocation. This value is not properly verified before unpacking stream data into this new location. 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