ZDI-09-040: Microsoft Office Excel QSIR Record Pointer Corruption Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-09-040 June 10, 2009 -- CVE ID: CVE-2009-1134 -- Affected Vendors: Microsoft -- Affected Products: Microsoft Office Excel -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. Exploitation requires user interaction in that a victim must open a malicious XLS file. The specific flaw exists within the parsing of the BIFF file format used by Microsoft Excel. When Excel 2007 encounters a malformed Qsir record (0x806) user data is improperly handled leading to potential code execution. Successful exploitation of this can lead to a remote compromise of the affected system running under the credentials of the currently logged in user. -- Vendor Response: Microsoft has issued an update to correct this vulnerability. More details can be found at: http://www.microsoft.com/technet/security/bulletin/MS09-021.mspx -- Disclosure Timeline: 2009-03-26 - Vulnerability reported to vendor 2009-06-10 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by: * Anonymous -- 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/
