Security News > 2024 > May > Fail2Ban: Ban hosts that cause multiple authentication errors

Fail2Ban is an open-source tool that monitors log files, such as /var/log/auth.

Log, and blocks IP addresses that exhibit repeated failed login attempts.

"Fail2Ban is a versatile and effective tool. It can block common attacks using community-driven filters with minimal configuration. Additionally, it can serve as a complex IDS/IPS system to meet specific administrative needs, such as detecting and blocking application or system-specific attack vectors," Sergey Brester, the developer of Fail2Ban, told Help Net Security.

Monitoring logfile and systemd journal Fully configurable regexps allow to capture info from log or journal and supply it to the action, so it is possible to ban not only IPs, but also users, sessions, or a combination of them.

Dynamic configuration allows simple creation of distribution-related config files for the maintainers and users.

Full support for subnets Geo- and whois-based factorization of the failures Fail2Ban network Speed-up of banning with introducing of bulk-ban mechanisms.

News URL

https://www.helpnetsecurity.com/2024/05/24/fail2ban-ban-hosts-authentication-errors/