-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ZDI-11-333 : RealNetworks RealPlayer ATRC Code Data Parsing Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-333 November 28, 2011 - -- CVE ID: CVE-2011-4250 - -- 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 how the ATRC codec parses sample data out of the media file. When reading bit sizes from the sample, the application will seek a structure that is used for consuming bits from the sample stream outside the bounds of the correct data. When decoding the sample, the application will use the transformed data to initialize another structure. Due to the sizes being unbound, this can be used to corrupt memory outside the original allocation. This type of memory corruption can be leveraged to gain 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) iQEcBAEBAgAGBQJO09A7AAoJEFVtgMGTo1sc1HoH/2bL5SdQADfpRt5Z0nsySKfk rQu9m2iq0/HSl/No7IFNcslAiU1EakfBVwvghXEXnW6PsaZxD7YmZWb+GY0z9k0o hpxuhKXv4wDgEQ4ZXSR5BJoLTGPwv5Cr1aIl56HF4EKmErl69zvkuA9qMoHljmZY y4rUI25fqRT6EpudnLGqd8dXyhJy9wsiP+F1l7K1KK0TET9ccCv9jzwr/7O1sq09 POzbdbjRKmrxSegM/YRFTLmWeyFLTlsW3qK36FvBi7Ats7N9YnK3NUhuwP3pnaUF PBWRB6983EJJpY9v9tmMUIo3Fn5lKhhYKksumlDwtPotxM3BUrHRUBQ59yxh30A= =PzwZ -----END PGP SIGNATURE-----
