Title

Successful/unsuccessful uses of "setsebool" in SLEM 5 must generate an audit record. (Cat II impact)

Discussion

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 "setsebool" command sets the current state of a particular SELinux boolean or a list of booleans to a given value. 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.

Check Content

Verify SLEM 5 generates an audit record for all uses of the "setsebool" command with the following command: > sudo grep -w "setsebool" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/setsebool -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

Configure the audit system to generate an audit event for any successful/unsuccessful uses of the "setsebool" command. Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/sbin/setsebool -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

Additional Identifiers

Rule ID: SV-261468r996811_rule

Vulnerability ID: V-261468

Group Title: SRG-OS-000062-GPOS-00031

Expert Comments

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