Advisory Details

August 16th, 2011

RealNetworks RealPlayer SWF DefineFont Remote Code Execution Vulnerability

ZDI-11-268
ZDI-CAN-1185

CVE ID CVE-2011-2948
CVSS SCORE 9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)
AFFECTED VENDORS RealNetworks
AFFECTED PRODUCTS RealPlayer
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11351. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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 DEFINEFONT fields in Flash Files. When the process parses corrupt a ShapeRecord with the DefineFont record it reads outside a stack buffer and uses a random stack value as a heap pointer. Later this pointer will be used to write data into. The resulting corruption can 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/08162011_player/en/
DISCLOSURE TIMELINE
  • 2011-04-01 - Vulnerability reported to vendor
  • 2011-08-16 - Coordinated public release of advisory
CREDIT Luigi Auriemma
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