ZDI-11-120: Microsoft Office Excel RealTimeData Record Parsing Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-120 April 12, 2011 -- CVE ID: CVE-2011-0101 -- CVSS: 9, (AV:N/AC:L/Au:N/C:P/I:P/A:C) -- Affected Vendors: Microsoft -- Affected Products: Microsoft Office Excel 2002 -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability by Digital Vaccine protection filter ID 10872. For further product information on the TippingPoint IPS, visit: http://www.tippingpoint.com -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The flaw exists within the methods used for RealTimeData Record Parsing. When handling a stTopic field has a bit set specifying double byte characters in the following field the value of a global pointer is improperly calculated. This pointer is later used in a memcpy operation whose source is user supplied data. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the 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/ms11-021.mspx -- Disclosure Timeline: 2010-11-15 - Vulnerability reported to vendor 2011-04-12 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by: * Aniway (Aniway.Anyway AT gmail DOT com) -- 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 _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/