Microsoft Excel File Format Parsing Vulnerability

Credit: Arnaud Dovi
Risk: High
Local: No
Remote: Yes
CWE: CWE-noinfo

CVSS Base Score: 5.1/10
Impact Subscore: 6.4/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

ZDI-06-004: Microsoft Excel File Format Parsing Vulnerability March 14, 2006 -- CVE ID: CVE-2006-0028 -- Affected Vendor: Microsoft -- Affected Products: Office 2000 Office XP Office 2003 -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since February 21, 2006 by Digital Vaccine protection filter ID 4156. 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 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 BOOLERR records, user-supplied data may be insecurely referenced thereby leading to the eventual execution of arbitrary code. -- Vendor Response: Microsoft has addressed this issue in Microsoft security bulletin MS06-012 titled "Vulnerabilities in Microsoft Office Could Allow Remote Code Execution": -- Disclosure Timeline: 2006.01.24 - Vulnerability reported to vendor 2006.02.21 - Digital Vaccine released to TippingPoint customers 2006.03.13 - Vulnerability information provided to ZDI security partners 2006.03.14 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by Arnaud Dovi aka 'class101', -- 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.

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