‘RealNetworks Realplayer QCP Parsing Code Execution Vulnerability’
‘The information has been provided by Sean de Regge.
The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-11-265/‘
* 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.
RealNetworks has issued an update to correct this vulnerability. More details can be found at:
2011-04-01 – Vulnerability reported to vendor
2011-08-16 – Coordinated public release of advisory’