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ZDI-11-335 : RealNetworks RealPlayer RV10 Sample Height Parsing Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-335
November 28, 2011

- -- CVE ID:
CVE-2011-4252

- -- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

- -- 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 11662.
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 Real Player. 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 when the application attempts to parse a height
out of the RV10 codec object. The application will incorrectly treat the
value as a signed integer and will its value as the count within a loop
that populates rows of sample data within a buffer. This can allow for
memory corruption which can lead to 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/11182011_player/en/



- -- Disclosure Timeline:
2011-08-12 - Vulnerability reported to vendor
2011-11-28 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Damian Put



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