-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ZDI-11-338 : RealNetworks RealPlayer IVR MLTI Chunk Length Parsing Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-338 November 28, 2011 - -- CVE ID: CVE-2011-4258 - -- 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 a header defined within a .ivr file. When parsing this header the application will explicitly trust a 16-bit value denoting an size and use it for performing an allocation. The code then uses a different value in the file to populate the buffer. Due to the difference in values used for allocation and the copy, this can be used to overwrite data outside the bounds of the buffer which 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 * 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) iQEcBAEBAgAGBQJO09F4AAoJEFVtgMGTo1scp0YH/3CA6agmhb3tkrli5HCd/6r8 mrJvalKJ6hg/pXPzGJPxs7QE3daV16UxJ4M39Luo304n73WuLhxJJHrIDLwugO+y Hzbp/QqGLR+Dg3d4TojZuZtgS7HEKEhPh9B5jDMtlNp7/BpSq0Jzi6swhkTR7rOu Wkz8B+0KwJxfxUEMQd9oins+DmXw1/LyegKM9+gLQK0iqHeejeKhsWH031OnKipv GQhlf5yR3Q1R0+fazYNzcasPgqTS5cuWvvwtk9KhnCIY0QygiZjh2+5tGQG+sDAl 9XfYpSD9yA9ClP2unrbqoyoB4c9wUkKKqKBGi/+0+I60U1ciWxDdnWddtx4bMos= =6sMx -----END PGP SIGNATURE-----
