ZDI-12-143 : Microsoft Visio DWGDP MTEXT Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-12-143 August 17, 2012 - -- CVE ID: CVE-2012-1888 - -- CVSS: 7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P - -- Affected Vendors: Microsoft - -- Affected Products: Microsoft Office - -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Visio. 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 DWGDP.DLL, which is responsible for parsing DXF files. When processing MTEXT strings in the ENTITIES section of the DXF file, certain characters are sought after to end the string copy function. If these characters are not found, the copy function will continue to copy data outside of the stack buffer, causing memory corruption. An attacker can utilize this vulnerability to execute code under the context of the program. - -- Vendor Response: Microsoft has issued an update to correct this vulnerability. More details can be found at: http://technet.microsoft.com/en-us/security/bulletin/ms12-059 - -- Disclosure Timeline: 2012-03-14 - Vulnerability reported to vendor 2012-08-17 - Coordinated public release of advisory - -- Credit: This vulnerability was discovered by: * Alexander Gavrun - -- 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