Successful/unsuccessful uses of "semanage" in SLEM 5 must generate an audit record.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-261467	SLEM-05-654220	SV-261467r996808_rule		Medium

Description
Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. The "semanage" command is used to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources. When a user logs on, the AUID is set to the UID of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to "-1". The AUID representation is an unsigned 32-bit integer, which equals "4294967295". The audit system interprets "-1", "4294967295", and "unset" in the same way.

Description

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. The "semanage" command is used to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources. When a user logs on, the AUID is set to the UID of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to "-1". The AUID representation is an unsigned 32-bit integer, which equals "4294967295". The audit system interprets "-1", "4294967295", and "unset" in the same way.

STIG	Date
SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-65196r996806_chk )
Verify SLEM 5 generates an audit record for all uses of the "semanage" command with the following command: > sudo grep -w "semanage" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-unix-update If the command does not return a line, or the line is commented out, this is a finding. Note: The "key=" value is arbitrary and can be different from the example output above.

Check Text ( C-65196r996806_chk )

Verify SLEM 5 generates an audit record for all uses of the "semanage" command with the following command:

> sudo grep -w "semanage" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-unix-update

If the command does not return a line, or the line is commented out, this is a finding.

Note: The "key=" value is arbitrary and can be different from the example output above.

Fix Text (F-65104r996807_fix)
Configure the audit system to generate an audit event for any successful/unsuccessful uses of the "semanage" command. Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-unix-update To reload the rules file, restart the audit daemon: > sudo systemctl restart auditd.service or issue the following command: > sudo augenrules --load

Fix Text (F-65104r996807_fix)

Configure the audit system to generate an audit event for any successful/unsuccessful uses of the "semanage" command.

Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file:

-a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-unix-update

To reload the rules file, restart the audit daemon:

> sudo systemctl restart auditd.service

or issue the following command:

> sudo augenrules --load