CIS Ubuntu Linux 18.04 LTS Benchmark

CIS Ubuntu Linux 18.04 LTS Benchmark

v2.0.1 - 01-03-2020

Terms of Use

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Table of Contents

Terms of Use ........................................................................................................................................................... 1 Overview ............................................................................................................................................................... 13

Intended Audience........................................................................................................................................ 13 Consensus Guidance..................................................................................................................................... 13 Typographical Conventions ...................................................................................................................... 15 Scoring Information ..................................................................................................................................... 15 Profile Definitions ......................................................................................................................................... 16 Acknowledgements ...................................................................................................................................... 17 Recommendations ............................................................................................................................................. 19 1 Initial Setup.................................................................................................................................................. 20

1.1 Filesystem Configuration ............................................................................................................... 21 1.1.1 Disable unused filesystems................................................................................................... 22 1.1.1.1 Ensure mounting of cramfs filesystems is disabled (Scored) ......................... 23 1.1.1.2 Ensure mounting of freevxfs filesystems is disabled (Scored)....................... 25 1.1.1.3 Ensure mounting of jffs2 filesystems is disabled (Scored) .............................. 27 1.1.1.4 Ensure mounting of hfs filesystems is disabled (Scored) ................................. 29 1.1.1.5 Ensure mounting of hfsplus filesystems is disabled (Scored) ........................ 31 1.1.1.6 Ensure mounting of squashfs filesystems is disabled (Scored) ..................... 33 1.1.1.7 Ensure mounting of udf filesystems is disabled (Scored) ................................ 35 1.1.1.8 Ensure mounting of FAT filesystems is limited (Not Scored) ......................... 37 1.1.2 Ensure /tmp is configured (Scored) ............................................................................. 39 1.1.3 Ensure nodev option set on /tmp partition (Scored) ............................................ 42 1.1.4 Ensure nosuid option set on /tmp partition (Scored) ........................................... 44 1.1.5 Ensure noexec option set on /tmp partition (Scored) .......................................... 46 1.1.6 Ensure separate partition exists for /var (Scored)................................................. 48 1.1.7 Ensure separate partition exists for /var/tmp (Scored) ...................................... 50 1.1.8 Ensure nodev option set on /var/tmp partition (Scored) ................................... 52 1.1.9 Ensure nosuid option set on /var/tmp partition (Scored) .................................. 53 1.1.10 Ensure noexec option set on /var/tmp partition (Scored)............................... 54

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1.1.11 Ensure separate partition exists for /var/log (Scored) ..................................... 55 1.1.12 Ensure separate partition exists for /var/log/audit (Scored)......................... 57 1.1.13 Ensure separate partition exists for /home (Scored) ......................................... 59 1.1.14 Ensure nodev option set on /home partition (Scored) ...................................... 61 1.1.15 Ensure nodev option set on /dev/shm partition (Scored) ............................... 62 1.1.16 Ensure nosuid option set on /dev/shm partition (Scored) .............................. 64 1.1.17 Ensure noexec option set on /dev/shm partition (Scored).............................. 66 1.1.18 Ensure nodev option set on removable media partitions (Not Scored) ...... 68 1.1.19 Ensure nosuid option set on removable media partitions (Not Scored) ..... 69 1.1.20 Ensure noexec option set on removable media partitions (Not Scored)..... 70 1.1.21 Ensure sticky bit is set on all world-writable directories (Scored) ............... 71 1.1.22 Disable Automounting (Scored) .................................................................................. 73 1.1.23 Disable USB Storage (Scored)....................................................................................... 75 1.2 Configure Software Updates ......................................................................................................... 77 1.2.1 Ensure package manager repositories are configured (Not Scored)............... 78 1.2.2 Ensure GPG keys are configured (Not Scored) ......................................................... 79 1.3 Configure sudo ................................................................................................................................... 80 1.3.1 Ensure sudo is installed (Scored) .................................................................................. 81 1.3.2 Ensure sudo commands use pty (Scored) .................................................................. 83 1.3.3 Ensure sudo log file exists (Scored).............................................................................. 84 1.4 Filesystem Integrity Checking...................................................................................................... 85 1.4.1 Ensure AIDE is installed (Scored).................................................................................. 86 1.4.2 Ensure filesystem integrity is regularly checked (Scored) .................................. 88 1.5 Secure Boot Settings ........................................................................................................................ 90 1.5.1 Ensure permissions on bootloader config are configured (Scored) ................ 91 1.5.2 Ensure bootloader password is set (Scored) ............................................................ 93 1.5.3 Ensure authentication required for single user mode (Scored) ........................ 96 1.5.4 Ensure interactive boot is not enabled (Not Scored)............................................. 97 1.6 Additional Process Hardening ..................................................................................................... 98 1.6.1 Ensure XD/NX support is enabled (Scored) .............................................................. 99

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1.6.2 Ensure address space layout randomization (ASLR) is enabled (Scored) ..101 1.6.3 Ensure prelink is disabled (Scored)............................................................................103 1.6.4 Ensure core dumps are restricted (Scored) ............................................................104 1.7 Mandatory Access Control...........................................................................................................106 1.7.1 Configure AppArmor .............................................................................................................107 1.7.1.1 Ensure AppArmor is installed (Scored).................................................................107 1.7.1.2 Ensure AppArmor is enabled in the bootloader configuration (Scored)..109 1.7.1.3 Ensure all AppArmor Profiles are in enforce or complain mode (Scored) .............................................................................................................................................................. 111 1.7.1.4 Ensure all AppArmor Profiles are enforcing (Scored) .....................................113 1.8 Warning Banners.............................................................................................................................115 1.8.1 Command Line Warning Banners ....................................................................................116 1.8.1.1 Ensure message of the day is configured properly (Scored).........................117 1.8.1.2 Ensure local login warning banner is configured properly (Scored).........119 1.8.1.3 Ensure remote login warning banner is configured properly (Scored)....121 1.8.1.4 Ensure permissions on /etc/motd are configured (Scored) .........................123 1.8.1.5 Ensure permissions on /etc/issue are configured (Scored) .........................124 1.8.1.6 Ensure permissions on /etc/ are configured (Scored) ..................125 1.8.2 Ensure GDM login banner is configured (Scored).................................................126 1.9 Ensure updates, patches, and additional security software are installed (Not Scored) ..............................................................................................................................................128 2 Services........................................................................................................................................................130 2.1 inetd Services....................................................................................................................................131 2.1.1 Ensure xinetd is not installed (Scored) .....................................................................132 2.1.2 Ensure openbsd-inetd is not installed (Scored).....................................................134 2.2 Special Purpose Services ..............................................................................................................135 2.2.1 Time Synchronization ...........................................................................................................136 2.2.1.1 Ensure time synchronization is in use (Scored).................................................137 2.2.1.2 Ensure systemd-timesyncd is configured (Not Scored)..................................139 2.2.1.3 Ensure chrony is configured (Scored)....................................................................142 2.2.1.4 Ensure ntp is configured (Scored) ...........................................................................144

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