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Zero Day Initiative Advisory 11-337

Zero Day Initiative Advisory 11-337
Posted Nov 29, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-337 - 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 within how the application parses sample data encoded with the RV30 codec. When parsing this sample data, the application will make an allocation and then fail to completely initialize the buffer. During decoding of the sample data, the application will explicitly trust an index from the partially filled buffer and then use that to calculate an address to write to. This can lead to memory corruption which can be converted into code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-4256
MD5 | 10f78e6d499d58655257bf60e10da003

Zero Day Initiative Advisory 11-337

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ZDI-11-337 : RealNetworks RealPlayer RV30 Uninitialized Index Value
Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-337
November 28, 2011

- -- CVE ID:
CVE-2011-4256

- -- 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 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 within how the application parses sample data
encoded with the RV30 codec. When parsing this sample data, the
application will make an allocation and then fail to completely
initialize the buffer. During decoding of the sample data, the
application will explicitly trust an index from the partially filled
buffer and then use that to calculate an address to write to. This can
lead to memory corruption which can be converted into 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



- -- 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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