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Ensure rsync service is not enabled The rsyncd service can be used to synchronize files between systems over network links.

Disable IP Forwarding The net.ipv4.ip_forward flag is used to tell the server whether it can forward packets or not. If the server is not to be used as a router, set the flag to 0.

Disable ICMP Redirect Acceptance ICMP redirect messages are packets that convey routing information and tell your host (acting as a router) to send packets via an alternate path. It is a way of allowing an outside routing device to update your system routing tables. By setting net.ipv4.conf.all.accept_redirects to 0, the system will not accept any ICMP redirect messages, and therefore, won't allo ...

Set SSH MaxAuthTries to 4 or Less The MaxAuthTries parameter specifies the maximum number of authentication attempts permitted per connection. When the login failure count reaches half the number, error messages will be written to the syslog file detailing the login failure.

Disable IPv6 Although IPv6 has many advantages over IPv4, few organizations have implemented IPv6.

Configure logrotate The system includes the capability of rotating log files regularly to avoid filling up the system with logs or making the logs unmanageable large. The file /etc/logrotate.d/rsyslog is the configuration file used to rotate log files created by rsyslog.

Set User/Group Owner and Permission on /etc/cron.monthly The /etc/cron.monthly directory contains system cron jobs that need to run on a monthly basis. The files in this directory cannot be manipulated by the crontab command, but are instead edited by system administrators using a text editor. The commands below restrict read/write and search access to user and group root, preventing regular user ...

Ensure NFS and RPC are not enabled The Network File System (NFS) is one of the first and most widely distributed file systems in the UNIX environment. It provides the ability for systems to mount file systems of other servers through the network.

Set User/Group Owner and Permission on /etc/cron.daily The /etc/cron.daily directory contains system cron jobs that need to run on a daily basis. The files in this directory cannot be manipulated by the crontab command, but are instead edited by system administrators using a text editor. The commands below restrict read/write and search access to user and group root, preventing regular users from ...

Disable SSH Root Login The PermitRootLogin parameter specifies if the root user can log in using ssh(1). The default is no.


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