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From:ZDI
Date:11.12.2011
Subject:ZDI-11-344 : RealNetworks RealPlayer RV20 Decoding Remote Code Execution Vulnerability

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ZDI-11-344 : RealNetworks RealPlayer RV20 Decoding Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-344
December  7, 2011

- -- CVE ID:
CVE-2011-4253

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

- -- Affected Vendors:

RealNetworks



- -- Affected Products:

RealNetworks 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 that the application allocates
space for parsing sample data encoded with the RV20 codec. After
allocation, the application will partially fill the allocation with
sample data. Upon usage of this sample data, the application will use
the uninitialized data to calculate an index that is then written into.
This 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
2011-12-07 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Damian Put


* Andrzej Dyjak



- -- 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
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