[NEWS] Cross Site Scripting Vulnerability Found in Yahoo WebSite

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To: list@securiteam.com
Date: 24 Aug 2003 16:41:09 +0200

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  Cross Site Scripting Vulnerability Found in Yahoo WebSite
------------------------------------------------------------------------

SUMMARY

A vulnerability in Yahoo web site allows remote attackers to cause it to
insert malicious HTML or JavaScript into existing web pages of Yahoo
Website.

DETAILS

Every time you use Yahoo messenger to send file to other Yahoo messenger
users, Yahoo messenger will ask you whether you want to upload the file to
Yahoo servers. If you chose yes then Yahoo messenger will upload the file
to Yahoo server and provide you with a link for the downloading process.
This link can then be sent to a friend for downloading.

Links typically look like:
http://us.f1.yahoofs.com/msgr/YahooID/.tmp/Filename.html?Random_Code

Where:
 YahooID: Your Yahoo messenger ID
 FileName: Your filename
 Random_Code: is a set of random characters (Alphanumeric) which only the
person who know this random code is allowed to access to this file.
 
Now all you need in order to add a malicious HTML or JavaScript is place
it after the last "/". The HTML or JavaScript will be parsed into the
response received from the server.

Example:
http://us.f1.yahoofs.com/msgr/YahooID/.tmp/<
script>alert('Hat-Squad.com');</script>
http://us.f2.yahoofs.com/< script>alert('Hat-Squad.com');</script>
http://us.f2.yahoofs.com/<
script>window.open("http://www.hat-squad.com")</script>

Vendor response:
The vendor has been contacted, no response has been received, it appears
though that he has fixed the issue.

ADDITIONAL INFORMATION

The information has been provided by <mailto:nima_majidi@hat-squad.com>
nima_majidi.

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