Detections
Analytics
6.2.3.29 Ensure successful and unsuccessful attempts to use the chacl command are collected
Information
The operating system must generate audit records for successful/unsuccessful uses of the chacl command.chacl is an IRIX-compatibility command, and is maintained for those users who are familiar with its use from either XFS or IRIX.
chacl changes the ACL(s) for a file or directory. Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.
Audit records can be generated from various components within the information system (e.g., module or policy filter).
Solution
- Add the audit rule(s) that monitor use of the /usr/bin/chacl command. The procedure adds the rule only when the command exists, so augenrules --load does not error. Run:#!/usr/bin/env bash
{
UID_MIN="$(awk '/^[[:space:]]*UID_MIN/{print $2}' /etc/login.defs)"
[ -e /usr/bin/chacl ] && printf '%s\n' "-a always,exit -S all -F path=/usr/bin/chacl -F perm=x -F auid>=$UID_MIN -F auid!=unset -k perm_chng"
} >> /etc/audit/rules.d/50-perm_chng.rules
- Merge and load the rules into active configuration:
# augenrules --load
- Check if reboot is required:
# if [[ $(auditctl -s | grep "enabled") =~ "2" ]]; then printf "Reboot required to load rules\n"; fi
See Also
Item Details
Category: AUDIT AND ACCOUNTABILITY, SYSTEM AND INFORMATION INTEGRITY
References: 800-53|AU-2, 800-53|AU-7, 800-53|AU-12, 800-53|SI-5, CSCv7|6.2
Plugin: Unix
Control ID: 00ba0cb8ee756cd813d26824ec859b1e602ee05c5ae74e01eaa94db3c4294819