Georgi Guninski security advisory #7, 2000

Wordpad vulnerability, exploitable also in IE for Win9x

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There is a vulnerability in Wordpad which allows executing arbitrary programs without warning the user after activating an embedded or linked object. This may be also exploited in IE for Win9x.

Wordpad executes programs embeded in .doc or .rtf documents without any warning if the object is activated by doubleclick.
This may be exploited in IE for Win9x using the view-source: protocol. The view-source: protocol starts Notepad, but if the file is large, then the user is asked to use Wordpad. So creating a large .rtf document and creating a HTML view-source: link to it in a HTML page or HTML based email message will prompt the user to use Wordpad and a program may be executed if the user doubleclicks on an object in the opened document.

Demonstration which starts AUTOEXEC.BAT
Workaround: Do not activate objects in Wordpad documents

Copyright Georgi Guninski

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