-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ZDI-11-331 : RealNetwork RealPlayer MPG Width Integer Underflow Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-331 November 28, 2011 - -- CVE ID: CVE-2011-4259 - -- 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 11474. 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 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 RealPlayer handles MPEG files. Realplayer parses the mpg file by doing a do while loop where it uses the width of the movie for the loop condition. However, it will substracts 1 from the width for every iteration of the loop and then compare it to 0. If the width of the movie was zero at the beginning the loop will run 0xFFFFFFFF times. This results in a memory corruption that can lead to remote code execution under the context of the current user. - -- 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: 2011-08-22 - Vulnerability reported to vendor 2011-11-28 - 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) iQEcBAEBAgAGBQJO08+mAAoJEFVtgMGTo1scdzsH/1rrlG/kf183ITBGC+EVHNrf 9akmwh6jTmPw5t83ppIRSY0oFT1lNpdBWWRC2gcinCpS5kotGI7UcDK4UFiIbv0z pGjJZtbCtd8booJF+kojV5uKTjgABtnyN2UYr745rPBOPbLosulwMCffy2kX5AtS FBj5vlP9geANrAdbv89DvJmNBqZDxe2R3aR2bO8p0E6o13x9D6LzoKl60RQXk+5n 77k/Wd/WE5yXMPONHxhNfJWqKHdg0A0zoJicvkOVSi/ZwcOMw+2XNk9Ilt5RShIl FdVYNBdb9wZ2sl5a1ieFbgKgGbeyExQOJKl7nwsF/gR5TceQ9iN0GhbDm4V4oYw= =5l0Z -----END PGP SIGNATURE-----
