-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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