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V-260471

CAT II (Medium)

Ubuntu 22.04 LTS must initiate session audits at system startup.

Rule ID

SV-260471r1155214_rule

STIG

Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

Version

V2R8

CCIs

CCI-001464

Discussion

If auditing is enabled late in the startup process, the actions of some startup processes may not be audited. Some audit systems also maintain state information only available if auditing is enabled before a given process is created.

Check Content

Verify that Ubuntu 22.04 LTS enables auditing at system startup in GRUB. 

Check the main GRUB defaults to ensure auditing is enabled:
$ sudo grep -ir GRUB_CMDLINE_LINUX /etc/default/grub
/etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT="audit=1"
/etc/default/grub:GRUB_CMDLINE_LINUX="audit=1"
 
If any Linux lines do not contain "audit=1", this is a finding.

Check the generated GRUB configuration to ensure the setting is propagated to the bootloader:
$ sudo grep "^\s*linux" /boot/grub/grub.cfg 
linux   /vmlinuz-6.8.0-31-generic root=UUID=c92a542f-aee4-4af9-94b2-203624ccb8e3 ro audit=1 quiet splash $vt_handoff
linux   /vmlinuz-6.8.0-31-generic root=UUID=c92a542f-aee4-4af9-94b2-203624ccb8e3 ro recovery nomodeset dis_ucode_ldr audit=1
 
If any Linux lines do not contain "audit=1", this is a finding.

Note: Output details may vary by system.

Fix Text

Configure Ubuntu 22.04 LTS to produce audit records at system startup.  
 
Edit the "/etc/default/grub" file and add "audit=1" to the "GRUB_CMDLINE_LINUX" option and to the "GRUB_CMDLINE_LINUX_DEFAULT" option. 

GRUB_CMDLINE_LINUX_DEFAULT="audit=1"
GRUB_CMDLINE_LINUX="audit=1"
 
To update the grub config file, run: 
 
$ sudo update-grub