Advisory Details

June 8th, 2012

RealNetworks RealPlayer QCELP Stream Parsing Remote Code Execution Vulnerability

ZDI-12-092
ZDI-CAN-1313

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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