ZDI-06-033: Microsoft Office Excel File Format DATETIME Record Parsing Vulnerability

Type securityvulns
Reporter Securityvulns
Modified 2006-10-11T00:00:00


ZDI-06-033: Microsoft Office Excel File Format DATETIME Record Parsing Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-06-033.html October 10, 2006

-- CVE ID: CVE-2006-2387

-- Affected Vendor: Microsoft

-- Affected Products: Microsoft Office 2000 SP3 Microsoft Office XP SP3 Microsoft Office 2003 SP1 / SP2 Microsoft Office 2004 for Mac Microsoft Office v.X for Mac Microsoft Works Suites 2004, 2005 and 2006

-- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since October 10, 2006 by Digital Vaccine protection filter ID 4746. For further product information on the TippingPoint IPS:


-- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office. Exploitation requires that the attacker coerce the target user into opening a malicious .XLS file.

The specific flaw exists within the parsing of the BIFF file format used by Microsoft Excel. During the processing of malformed DATETIME records, user-supplied data may be insecurely referenced thereby leading to the eventual execution of arbitrary code.

-- Vendor Response: Microsoft has issued an update to correct this vulnerability. More details can be found at:


-- Disclosure Timeline: 2006.06.15 - Vulnerability reported to vendor 2006.10.10 - Digital Vaccine released to TippingPoint customers 2006.10.10 - Coordinated public release of advisory

-- Credit: This vulnerability was discovered by Manuel Santamarina Suarez.

-- About the Zero Day Initiative (ZDI): Established by TippingPoint, a division of 3Com, 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:


The ZDI is unique in how the acquired vulnerability information is used. 3Com does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, 3Com 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, 3Com provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product.