ZDI-11-316 : Apple QuickTime H264 Matrix Conversion Remote Code Execution Vulnerability


ZDI-11-316 : Apple QuickTime H264 Matrix Conversion Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-316 October 27, 2011 -- CVE ID: CVE-2011-3251 -- CVSS: 7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P -- Affected Vendors: Apple -- Affected Products: Apple Quicktime -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Quicktime. 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 Quicktime processes the matrix structures in the 'tkhd' atom for mp4 files. When the matrix structure contains large values a movs instruction can turn the value negative. When Quicktime later uses the function to determine where it should write its data it does check the upper boundaries, but not the lower ones causing a heap buffer underwrite. This can result in remote code execution under the context of the current user. -- Vendor Response: Apple has issued an update to correct this vulnerability. More details can be found at: http://support.apple.com/kb/HT5016 -- Disclosure Timeline: 2011-07-20 - Vulnerability reported to vendor 2011-10-27 - 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