82 lines
2.3 KiB
Ruby
82 lines
2.3 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::Auxiliary
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include Msf::Exploit::Remote::Tcp
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include Msf::Auxiliary::Report
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include Msf::Auxiliary::Scanner
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def initialize
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super(
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'Name' => 'VNC Authentication None Detection',
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'Description' => 'Detect VNC servers that support the "None" authentication method.',
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'References' => [
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['CVE', '2006-2369'], # a related instance where "None" could be offered and used when not configured as allowed.
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['URL', 'https://en.wikipedia.org/wiki/RFB'],
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['URL', 'https://en.wikipedia.org/wiki/Vnc'],
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],
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'Author' => [
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'Matteo Cantoni <goony[at]nothink.org>',
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'jduck'
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],
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'License' => MSF_LICENSE
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)
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register_options(
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[
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Opt::RPORT(5900)
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]
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)
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end
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def run_host(target_host)
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connect
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vnc = Rex::Proto::RFB::Client.new(sock, allow_none: true)
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unless vnc.handshake
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print_error("#{target_host}:#{rport} - Handshake failed: #{vnc.error}")
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return
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end
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ver = "#{vnc.majver}.#{vnc.minver}"
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print_status("#{target_host}:#{rport} - VNC server protocol version: #{ver}")
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svc = report_service(
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host: rhost,
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port: rport,
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proto: 'tcp',
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name: 'vnc',
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info: "VNC protocol version #{ver}"
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)
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type = vnc.negotiate_authentication
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unless type
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print_error("#{target_host}:#{rport} - Auth negotiation failed: #{vnc.error}")
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return
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end
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# Show the allowed security types
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sec_type = []
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vnc.auth_types.each do |t|
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sec_type << Rex::Proto::RFB::AuthType.to_s(t)
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end
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print_status("#{target_host}:#{rport} - VNC server security types supported: #{sec_type.join(', ')}")
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if (vnc.auth_types.include? Rex::Proto::RFB::AuthType::None)
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print_good("#{target_host}:#{rport} - VNC server security types includes None, free access!")
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report_vuln(
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{
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host: rhost,
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service: svc,
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name: name,
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info: "Module #{fullname} identified the VNC 'none' security type: #{sec_type.join(', ')}",
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refs: references,
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exploited_at: Time.now.utc
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}
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)
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end
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ensure
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disconnect
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end
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end
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