RealNetworks RealPlayer QCELP Stream Parsing Remote Code Execution Vulnerability

June 8th, 2012
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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