Title: Microsoft Internet Explorer Scriptlet Rendering Vulnerability
Severity: MODERATE
Description:
By design, the Scriptlet Component of Microsoft Internet Explorer (the ActiveX control that invokes scriplets) is only supposed to render HTML files. However, it will render any file type.
Due to this design error, a malicious website operator may gain read access to known files on a remote system by injecting valid HTML code into a file that would be run at the privilege level of the Local Computer Zone. This file may contain a script that could forward the contents of known files to the website operator. The files that can be read are limited to what can be open in a browser window (eg. txt, .htm or .js files, not .exe files).
Update (December 1, 2000): A new variant of this vulnerability was discovered. Microsoft has released a new patch to address all known variants of this vulnerability.
Affected Products:
- Microsoft Internet Explorer 4.0.0
- Microsoft Internet Explorer 4.0.0 for Windows 3.1
- Microsoft Internet Explorer 4.0.0 for Windows 95
- Microsoft Internet Explorer 4.0.0 for Windows NT 3.51
- Microsoft Internet Explorer 4.0.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0 for Windows 2000
- Microsoft Internet Explorer 5.0 for Windows 95
- Microsoft Internet Explorer 5.0 for Windows 98
- Microsoft Internet Explorer 5.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0.1
- Microsoft Internet Explorer 5.0.1 SP1
- Microsoft Internet Explorer 5.5
- Microsoft Internet Explorer 5.5 SP1
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows ME
- Microsoft Windows NT 4.0
References:
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin (MS00-055)
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin (MS00-093)
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