Ensure session initiation information is collected

LowLevel 2Automatedlinux

Description

Monitor session initiation events. The parameters in this section track changes to the files associated with session events. • /var/run/utmp - tracks all currently logged in users. • /var/log/wtmp - file tracks logins, logouts, shutdown, and reboot events. • /var/log/btmp - keeps track of failed login attempts and can be read by entering the command /usr/bin/last -f /var/log/btmp. All audit records will be tagged with the identifier "session."

How it is checked

Audit method: Shell command

shell

alt0() { o=$(bash -c 'auditctl -l | grep -Ps -- '"'"'(\/var\/run\/utmp|\/var\/log\/wtmp|\/var\/log\/btmp)'"'"'' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-a always,exit -F path=/var/run/utmp -F perm=wa' || { echo step1: missing '-a always,exit -F path=/var/run/utmp -F perm=wa'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-a always,exit -F path=/var/log/wtmp -F perm=wa' || { echo step1: missing '-a always,exit -F path=/var/log/wtmp -F perm=wa'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-a always,exit -F path=/var/log/btmp -F perm=wa' || { echo step1: missing '-a always,exit -F path=/var/log/btmp -F perm=wa'; return 1; }; o=$(bash -c 'grep -Ps -- '"'"'(\/var\/run\/utmp|\/var\/log\/wtmp|\/var\/log\/btmp)'"'"' /etc/audit/rules.d/*.rules' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b64 -S all -F' || { echo step2: missing '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'path=/var/run/utmp -F perm=wa -F key=session' || { echo step2: missing 'path=/var/run/utmp -F perm=wa -F key=session'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b64 -S all -F' || { echo step2: missing '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'path=/var/log/wtmp -F perm=wa -F key=session' || { echo step2: missing 'path=/var/log/wtmp -F perm=wa -F key=session'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b64 -S all -F' || { echo step2: missing '/etc/audit/rules.d/50-session.rules:-a always,exit -F arch=b'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'path=/var/log/btmp -F perm=wa -F key=session' || { echo step2: missing 'path=/var/log/btmp -F perm=wa -F key=session'; return 1; }; }; if alt0; then echo compliant; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Note: • The -w option is deprecated and the rule should be updated in accordance with the Remediation Procedure. • For best performance, the arch field should be supplied in the rule. The individual permissions will cause the selection of specific system calls that use that kind of access. Not supplying the arch will cause the selection of all system calls which will affect performance as all system calls will be evaluated. 1. Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor session initiation information. Example: # printf " -a always,exit -F arch=b64 -S all -F path=/var/run/utmp -F perm=wa -F key=session -a always,ex…

Properties

Operating systems: rocky-10
Tags: cis-convertedlinux
Reference: CIS Rocky Linux 10 Benchmark v1.0.0 - 6.3.3.22

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target linux --level 2