‘RealNetworks Realplayer QCP Parsing Code Execution Vulnerability’


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of RealNetworks RealPlayer.’


‘The information has been provided by Sean de Regge.
The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-11-265/


Vulnerable Systems:
 * 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 qcpfformat.dll, which is responsible for parsing QCP media files. The process creates a static 256 byte allocation on the heap and trusts a user-supplied counter from the file within a memory copy loop. As the source data is also user-supplied from the file, this can be abused by a remote attacker to execute arbitrary code running in the context of the web browser.

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

CVE Information:

Disclosure Timeline:
2011-04-01 – Vulnerability reported to vendor
2011-08-16 – Coordinated public release of advisory’

Categories: Windows