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directory traversal in ParaChat Server 5.5

from [Donato Ferrante] Network Security [Permanent Link]
Subject: directory traversal in ParaChat Server 5.5
Date: Tue, 28 Sep 2004 21:16:15 -0000 
                           Donato Ferrante


Application:  ParaChat Server
              http://www.parachat.com/

Version:      5.5

Bug:          directory traversal

Date:         28-Sep-2004

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:
----------------

Vendor's Description:

"ParaChat Server v5.5 is a fast, easy and affordable way to host and
manage your own real-time communication software - for one web site,
or for multiple web sites."



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------------
2. The bug:
------------

The server is not able to manage the sequence "..%5C/", that is
equal to "..\/", this lets an attacker to navigate through the
victim system simply using a web browser.



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-------------
3. The code:
-------------

To test the vulnerability:

http://[host]:7877/..%5C/..%5C/



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------------
4. The fix:
------------

Vendor was contacted.
Bug will be fixed in the next version.



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