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Advisory Title: MSN Groups makes cross site scripting easy

Release Date: 28/07/2002


Platform: Not applicable.

Version: till 28.Jun.2002 this exploit still works.

Severity: XSS

[ ]

Vendor Status:
a. I informed on 27 th May 2002 (2 months ago)
b. 30th May I got confirmation that they opened an "MSRC investigation".
c. ID for this investigation is "ID is [MSRC 1174dg]"
d. No FIX yet. Plus I got no further feedback from Microsoft. I'm quite sure the investigation got lost somewhere :-p

I put up email conversation with Microsoft on EoS:



(extracted from the help on

My Groups is a list of links to all the MSN groups that you have created,
joined, or marked as interesting places to visit again. When you are signed in with your Microsoft .NET Passport, your My Groups list can be viewed:

o On the MSN People & Chat page.
o On the MSN Groups home page.
o When you click My Groups near the upper-left corner of any MSN Groups page.

Groups that you join or create are automatically added to your My Groups list. You can also add groups you like to visit by clicking Add to
Groups I Visit on the What's New page of the group.

Problem allows any member to upload any file and share them with others. This means that malicious users can upload files which can contain Active Content such as JavaScript and VBScript. Some of these file types include:
- maybe a lot more file types.

Exploit Examples.
Before accessing this page you will be asked to authenticate.
I put up 2 examples:
c00kie.swf (check out for more info)

Both of these examples popup an alert with the cookie data.

You may also link to these from Hotmail by sending an e-mail as demonstrated
on "Demo 3":


There are different approaches that should be taken. I think the approach should be the same as with other Cross Site Scripting issues.


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