Microsoft Excel Calendar Object Input Validation Vulnerability

Overview

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iPolicy Networks Security Advisory


Date Discovered:	10/14/2008
Severity:	High
Applications Affected:	Microsoft Office 2000 SP3 Microsoft Office XP SP3 Microsoft Office 2003 SP2 Microsoft Office 2003 SP3 Microsoft Office Excel Viewer 2003 Microsoft Office Excel Viewer 2003 SP3 Microsoft Office Excel Viewer

Synopsis

Microsoft Excel is prone to a input validation vulnerability in calendar object. The vulnerability exists in the way Excel processes a VBA Performance Cache. The vulnerability is due to Excel does not perform sufficient validation of data in the VBA Performance Cache.

Recommended Actions

Update the patches as guided by vendor at :
http://www.microsoft.com/technet/security/bulletin/ms08-057.mspx

Threat Analysis

The vulnerability is due to Excel does not perform sufficient validation of data in the VBA Performance Cache. The vulnerability could allow remote code execution if a user opens a specially crafted Excel file in a VBA Performance Cache.

An attacker who successfully exploited this vulnerability could take complete control of the affected system. An attacker could then install programs, view, change, delete data or create new accounts with full user rights.

References

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3477

Write-up by: Aditya Chaturvedi

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