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 &amp; Andreas Schmidt (www.siberas.de<http://www.siberas.de>)

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi