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Enable Ignore Broadcast Requests Setting net.ipv4.icmp_echo_ignore_broadcasts to 1 will cause the system to ignore all ICMP echo and timestamp requests to broadcast and multicast addresses.

Disable Mounting of hfsplus Filesystems The hfsplus filesystem type is a hierarchical filesystem designed to replace hfs that allows you to mount Mac OS filesystems.

Set User/Group Owner on bootloader config Set the owner and group of your boot loaders config file to the root user. These instructions default to GRUB stored at /boot/grub/grub.cfg.

Ensure tftp-server is not enabled Trivial File Transfer Protocol (TFTP) is a simple file transfer protocol, typically used to automatically transfer configuration or boot machines from a boot server. The packages tftp and atftp are both used to define and support a TFTP server.

Disable DCCP The Datagram Congestion Control Protocol (DCCP) is a transport layer protocol that supports streaming media and telephony. DCCP provides a way to gain access to congestion control, without having to do it at the application layer, but does not provide in- sequence delivery.

Ensure discard is not enabled discard is a network service that simply discards all data it receives. This service is intended for debugging and testing purposes. It is recommended that this service be disabled.

Ensure Avahi Server is not enabled Avahi is a free zeroconf implementation, including a system for multicast DNS/DNS-SD service discovery. Avahi allows programs to publish and discover services and hosts running on a local network with no specific configuration. For example, a user can plug a computer into a network and Avahi automatically finds printers to print to, files to look at and people t ...

Set Lockout for Failed Password Attempts Lock out users after n unsuccessful consecutive login attempts. The first sets of changes are made to the PAM configuration file /etc/pam.d/login. The second set of changes are applied to the program specific PAM configuration file. The second set of changes must be applied to each program that will lock out users. Check the documentation for each seconda ...

Limit Password Reuse The /etc/security/opasswd file stores the users' old passwords and can be checked to ensure that users are not recycling recent passwords.

Verify Permissions on /etc/passwd The /etc/passwd file contains user account information that is used by many system utilities and therefore must be readable for these utilities to operate.


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