Advisory Details

June 8th, 2012

RealNetworks RealPlayer QCELP Stream Parsing Remote Code Execution Vulnerability

CVE ID	CVE-2011-4247
CVSS SCORE	7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	RealNetworks
AFFECTED PRODUCTS	RealPlayer
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 the way RealPlayer handles audio encoded with the QCELP codec. The codec allows you to specify the 'block_size' that is used. This size is used to create an allocation to hold the data, but a hardcoded blocksize is later used to copy data into that allocation. This could lead to remote code execution under the context of the current user.
ADDITIONAL DETAILS	RealNetworks has issued an update to correct this vulnerability. More details can be found at: http://service.real.com/realplayer/security/11182011_player/en/
DISCLOSURE TIMELINE	2011-07-05 - Vulnerability reported to vendor 2012-06-08 - Coordinated public release of advisory
CREDIT	Damian Put

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