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Microsoft word javascript execution

From: jplopezy () gmail com
Date: 18 May 2008 08:54:44 -0000

Products affected: Microsoft word 2003/2007
OS Tested : Windows Xp all patch

The vulnerability is that you can run javascript in an arbitrary manner without permission of the user. While it is 
limited what you can get to run, this may help attackers using methods that distort the environment javascript to tempt 
execute a malicious file. It also could run a page without the permission of the user to include any vulnerability or a 
script malignant in the user's browser.

To make the proof of concept follow the following steps

1-Make a html file and paste xss code
2-Open the html file with the word and save as document xml
3-Rename .xml to .doc
4-Open .doc file

XSS
---------------------------------------------------------
<html>
<OBJECT classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389><param name=url value=javascript:alert('Prueba')></OBJECT>
----------------------------------------------------------

It is important to include the tag <html> because it makes it to interpret the code followed.

One curiosity is that using this method and inserting a malformed object causing a denial of service.Significantly, the 
file must be saved with an RTF not with the DOC.

Crash
--------------------------------------------------
<html>
<OBJECT classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389> </OBJECT>
---------------------------------------------------
        
I leave some proof of concept that simply open a alert and another that leads to denial of services.

XSS
http://es.geocities.com/jplopezy/xss.doc

CRASH

http://es.geocities.com/jplopezy/crash.rtf



Juan Pablo Lopez Yacubian

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Microsoft word javascript execution jplopezy (May 19)