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Zero Day Initiative Advisory 11-336

Zero Day Initiative Advisory 11-336
Posted Nov 29, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-336 - 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 a user attempts to play a malicious video file containing a malformed codec name. When playing a malformed codec, the application will incorrectly free an object and then later attempt to use it by calling a virtual method pointer upon destruction. This can lead to code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-4255
SHA-256 | 9d53034c4b494677e64872a2ededd13105e2853f31741bbb3f677d42af486353

Zero Day Initiative Advisory 11-336

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ZDI-11-336 : RealNetworks RealPlayer Invalid Codec Name Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-336
November 28, 2011

- -- CVE ID:
CVE-2011-4255

- -- 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 11661.
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 a user attempts to play a malicious video
file containing a malformed codec name. When playing a malformed codec,
the application will incorrectly free an object and then later attempt
to use it by calling a virtual method pointer upon destruction. 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
2011-11-28 - 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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