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Zero Day Initiative Advisory 12-085

Zero Day Initiative Advisory 12-085
Posted Jun 7, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-085 - 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 dmp4 component. If the width value is altered inside the esds atom, arithmetic instructions within RealPlayer code can result in a loop counter wrapping to a large value. This can cause the loop to run too many times while operating on heap memory. By exploiting this condition, an attacker can corrupt memory and leverage that to execute code under the context of the user running the application.

tags | advisory, remote, arbitrary
advisories | CVE-2011-4261
SHA-256 | efbe76fedf3296c7ef451c7b351df87ac87091b6a35538b7186d05716162501f

Zero Day Initiative Advisory 12-085

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ZDI-12-085 : RealNetworks RealPlayer dmp4 esds Width Remote Code Execution
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-085
June 6, 2012

- -- CVE ID:

CVE-2011-4261

- -- 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 dmp4 component. If the width value is
altered inside the esds atom, arithmetic instructions within RealPlayer
code can result in a loop counter wrapping to a large value. This can cause
the loop to run too many times while operating on heap memory. By
exploiting this condition, an attacker can corrupt memory and leverage that
to execute code under the context of the user running 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:
2011-08-28 - Vulnerability reported to vendor
2012-06-06 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Luigi Auriemma

- -- 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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