ZDI-09-035: Microsoft Word Document Stack Based Buffer Overflow Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-09-035 June 10, 2009 -- CVE ID: CVE-2009-0563 -- Affected Vendors: Microsoft -- Affected Products: Microsoft Office Word -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Word. User interaction is required to exploit this vulnerability in that the target must visit a malicious page, open a malicious e-mail, or open a malicious file. The specific flaw exists within the parsing of vulnerable tags inside a Microsoft Word document. Microsoft Word trusts a length field read from the file which is used to read file contents into a buffer allocated on the stack. When an invalid length is present, a stack based buffer overflow occurs, resulting in the ability to execute arbitrary code. -- Vendor Response: Microsoft has issued an update to correct this vulnerability. More details can be found at: http://www.microsoft.com/technet/security/bulletin/MS09-027.mspx -- Disclosure Timeline: 2008-07-08 - Vulnerability reported to vendor 2009-06-10 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by: * ling & wushi of team509 -- 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/
