freesco.txt

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Software: FREESCO public http server - Running thttpd/2.05 09nov99  
Vendor: http://www.freesco.org  
Versions: 2.05  
Platforms: Unix  
Bug: Cross Site Scripting Vulnerabillity  
Risk: Low  
Exploitation: Remote with browser  
Date: 22 Jan 2004  
Author: Rafel Ivgi, The-Insider  
e-mail: [email protected]  
web: http://theinsider.deep-ice.com  
  
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1) Introduction  
2) Bug  
3) The Code  
  
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===============  
1) Introduction  
===============  
  
thttpd is a free "Open Source" webserver that comes by default with unix  
systems such as  
FREEBSD and Linux. freesco edited thttpd and published their own version.  
  
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======  
2) Bug  
======  
  
The Vulnerabillity is Cross Site Scripting. If an attacker will request the  
following  
url from the server  
http://<host>/cgi/example?test=<script>alert('xss')</script>  
The vulnerabillity exists in the servers default cgi example.  
XSS appears and the server allows an attacker to inject & execute scripts.  
  
In the words of securityfocus.com :  
~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
If all of these circumstances are met, an attacker may be able to exploit  
this issue  
via a malicious link containing arbitrary HTML and script code as part of  
the hostname.  
When the malicious link is clicked by an unsuspecting user, the  
attacker-supplied HTML  
and script code will be executed by their web client. This will occur  
because the server  
will echo back the malicious hostname supplied in the client's request,  
without sufficiently  
escaping HTML and script code.  
  
Attacks of this nature may make it possible for attackers to manipulate web  
content or to  
steal cookie-based authentication credentials. It may be possible to take  
arbitrary actions as the victim user.  
  
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===========  
3) The Code  
===========  
  
http://<host>/cgi/example?test=<script>alert('xss')</script>  
  
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---  
Rafel Ivgi, The-Insider  
http://theinsider.deep-ice.com  
  
"Things that are unlikeable, are NOT impossible."  
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