New IE 5.0 vulnerabilities using HTTP redirection

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Internet Explorer 5.0 under Windows 95 and NT 4.0 (suppose Win98 is vulnerable) allows reading local text and HTML files and files from any domain (probably reading files of other types of files is possible).
Window spoofing is possible.
It is also possible in some cases to read files behind fiewall.
This vulnerability may be exploited using HTML email message or a newsgroup posting.


The problem is something like a race condition immediately after"HTTP-redirecting-URL").
If you do:"HTTP-redirecting-url");
then you have access to the redirected URL's document using "b".

The code is:
alert("Create short text file c:\\test.txt and it will be read and shown in a message box");"");
// "" just does a HTTP redirect to: "file://c:/test.txt"

Disable Active Scripting

Demonstration is available at

I would like to give credit to Shane Hird from Australia for helping me discover this vulnerability.

Copyright 1999 Georgi Guninski

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