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Vulnerability Note VU#174177
Zoomify Viewer ActiveX control multiple stack buffer overflows
OverviewThe Zoomify Viewer ActiveX control contains multiple stack buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
I. DescriptionZoomify provides software to incorporate zoomable images into web sites. One of the Zoomify products is an ActiveX control for use with Internet Explorer web browsers. The Zoomify Viewer ActiveX control, which is provided by ZActiveX.dll, contains multiple stack buffer overflows. 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. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.III. SolutionWe are currently unaware of a practical solution to this problem. Please consider the following workarounds
Disable the Zoomify Viewer ActiveX control in Internet Explorer
The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:
{F7DC2A2E-FC34-11D3-B1D9-00A0C99B41BB}
More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{F7DC2A2E-FC34-11D3-B1D9-00A0C99B41BB}]
"Compatibility Flags"=dword:00000400
Disable ActiveX
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
http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://support.microsoft.com/kb/240797
http://secunia.com/advisories/25625/
Credit
This vulnerability was reported by Will Dormann of CERT/CC.
This document was written by Will Dormann.
Other Information
| Date Public | 06/11/2007 |
| Date First Published | 06/11/2007 03:56:14 PM |
| Date Last Updated | 06/14/2007 |
| CERT Advisory | |
| CVE Name | CVE-2007-2920 |
| Metric | 1.55 |
| Document Revision | 7 |
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