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Vulnerability Note VU#654577Microsoft Office Web Components Spreadsheet ActiveX control URL parsing stack buffer overflowOverviewThe Microsoft Office Web Components ActiveX controls contain a stack buffer overflow in the processing of URLs, which allows a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.I. DescriptionMicrosoft Office Web Components are ActiveX controls that provide Microsoft Office functionality, such as spreadsheets, tables, and charts. These ActiveX controls are provided by the file MSOWC.DLL. Several of the ActiveX controls provided by MSOWC.DLL are marked Safe for Scripting and Safe for Initialization, which means that they can be controlled by a web page in Internet Explorer. Microsoft Office Web Components are provided by multiple products including
II. ImpactBy convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user.III. SolutionApply an updateThis issue is addressed in Microsoft Security Bulletin MS08-017. This update provides a newer version of MSOWC.DLL, sets the kill bit for the vulnerable versions of the Microsoft Office Spreadsheet control, and sets the phoenix bit to retain compatibility with web pages that refer to the old CLSID for the Spreadsheet control.
{0002E511-0000-0000-C000-000000000046}
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{0002E510-0000-0000-C000-000000000046}] "Compatibility Flags"=dword:00000400 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{0002E511-0000-0000-C000-000000000046}] "Compatibility Flags"=dword:00000400 Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document. Systems Affected
References
This vulnerability was reported by Microsoft, who in turn credit Chris Ries of VigilantMinds and Xiao Hui of NCNIPC. This document was written by Will Dormann.
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