Security Report: 3/13/2024  

Issue: Potential SSH Brute-Force Attacks
Warning Level: 4

Analysis of the /var/log/auth.log file revealed multiple recent failed SSH login attempts from various IP addresses using invalid usernames like 'rvs', 'wzy', 'lwd', 'config', 'cad5', 'blqin', and 'zhangqp'. This behavior is consistent with brute-force or dictionary attack attempts against the SSH service.

Recommendation: Implement fail2ban or a similar intrusion prevention system to automatically block IP addresses after a configurable number of failed login attempts. This can help mitigate the risk of successful brute-force attacks. Additionally, consider disabling password-based authentication for SSH and enforcing key-based authentication for enhanced security.