Microsoft Office Excel FNGROUPCOUNT buffer overflow

excel-fngroupcount-bo (27464)

High Risk

Description:

Microsoft Office is vulnerable to a buffer overflow. By creating a malicious Excel file containing a malicious FNGROUPCOUNT value , a remote attacker could overflow a buffer and execute arbitrary code on the system with privileges of the user, once the Excel file is opened. An attacker could exploit this vulnerability by sending the malicious file to a victim as an email attachment or hosting it on a Web site.

Platforms Affected:

• Microsoft, Excel 2000
• Microsoft, Excel 2002
• Microsoft, Excel 2003
• Microsoft, Excel 2004 Mac OS
• Microsoft, Excel XP
• Microsoft, Excel Viewer 2003
• Microsoft, Office 2000 SP3
• Microsoft, Office 2003 SP1
• Microsoft, Office 2003 SP2
• Microsoft, Office 2004
• Microsoft, Office X Mac OS
• Microsoft, Office XP SP3

Remedy:

Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.

Consequences:

Gain Access

References:

• Full-Disclosure Mailing List, Tue Jul 11 2006 - 22:11:24 CDT, Microsoft Excel Could Allow Remote Code Execution by Malformed FNGROUPCOUNT value Vulnerability at http://archives.neohapsis.com/archives/fulldisclosure/2006-07/0240.html.
• Microsoft Security Bulletin MS06-037, Vulnerability in Microsoft Excel Could Allow Remote Code Execution (917285) at http://www.microsoft.com/technet/security/Bulletin/MS06-037.mspx.
• Microsoft Security Bulletin MS06-059, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (924164) at http://www.microsoft.com/technet/security/bulletin/ms06-059.mspx.
• Microsoft Security Bulletin MS07-002, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (927198) at http://www.microsoft.com/technet/security/Bulletin/MS07-002.mspx.
• Microsoft Security Bulletin MS07-023, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (934233) at http://www.microsoft.com/technet/security/bulletin/ms07-023.mspx.
• Microsoft Security Bulletin MS07-036, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (936542) at http://www.microsoft.com/technet/security/Bulletin/ms07-036.mspx.
• Microsoft Security Bulletin MS07-044, Vulnerability in Microsoft Excel Could Allow Remote Code Execution (940965) at http://www.microsoft.com/technet/security/bulletin/ms07-044.mspx.
• Microsoft Security Bulletin MS08-014, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (949029) at http://www.microsoft.com/technet/security/bulletin/MS08-014.mspx.
• Microsoft Security Bulletin MS08-026, Vulnerabilities in Microsoft Word Could Allow Remote Code Execution (951207) at http://www.microsoft.com/technet/security/bulletin/ms08-026.mspx.
• Microsoft Security Bulletin MS08-042, Vulnerability in Microsoft Word Could Allow Remote Code Execution (955048) at http://www.microsoft.com/technet/security/bulletin/ms08-042.mspx.
• Microsoft Security Bulletin MS08-043, Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (954066) at http://www.microsoft.com/technet/security/bulletin/ms08-043.mspx.
• Microsoft Security Bulletin MS08-051, Vulnerabilities in Microsoft PowerPoint Could Allow Remote Code Execution (949785) at http://www.microsoft.com/technet/security/Bulletin/MS08-051.mspx.
• ASA-2006-135: Windows Security Updates for July 2006 - (MS06-033 - MS06-039)
• BID-18890: Microsoft Excel FNGROUPCOUNT Record Remote Code Execution Vulnerability
• CVE-2006-1308: Unspecified vulnerability in Microsoft Excel 2000 through 2004 allows user-assisted attackers to execute arbitrary code via a .xls file with a crafted FNGROUPCOUNT value.
• FrSIRT/ADV-2006-2755: Microsoft Excel Document Handling Multiple Code Execution Vulnerabilities (MS06-037)
• SECTRACK ID: 1016472: Microsoft Excel Errors in Processing Various Malformed Records Let Remote Users Execute Arbitrary Code

Reported:

Jul 11, 2006

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