ZDI-10-280: RealNetworks RealPlayer ImageMap Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-280

December 10, 2010

-- CVE ID:
CVE-2010-4392

-- CVSS:
9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)

-- Affected Vendors:
RealNetworks

-- Affected Products:
RealNetworks RealPlayer

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10290.
For further product information on the TippingPoint IPS, visit:

    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 how the application decodes data for a
particular mime type within a RealMedia file. When decoding the data
used for rendering, the application will use the length of a string in
an addition used to calculate the size of a buffer. The application will
zero-extend it and then allocate. Due to the addition, the result of the
calculation can be greater than 16-bits, and when the typecast occurs
the result will be smaller than expected. When initializing this buffer,
a buffer overflow will occur which can allow for code execution under
the context of the application.

-- Vendor Response:
RealNetworks has issued an update to correct this vulnerability. More
details can be found at:

http://service.real.com/realplayer/security/12102010_player/en/

-- Disclosure Timeline:
2010-08-25 - Vulnerability reported to vendor
2010-12-10 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Sebastian Apelt & Andreas Schmidt (www.siberas.de<http://www.siberas.de>)

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