SLEM 5 must generate audit records for all uses of the "umount" system call.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-261460	SRG-OS-000037-GPOS-00015	SLEM-05-654185	SV-261460r996787_rule	2024-06-04	1

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.

ℹ️ Check
Verify SLEM 5 generates an audit record for all uses of the "umount" and "umount2" system calls with the following command: > sudo auditctl -l \| grep 'umount' -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=-1 -F key=privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=-1 -F key=privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=-1 -F key=privileged-umount If both the "b32" and "b64" audit rules are not defined for the "umount" syscall, this is a finding. Note: The "key=" value is arbitrary and can be different from the example output above.

ℹ️ Check

Verify SLEM 5 generates an audit record for all uses of the "umount" and "umount2" system calls with the following command: > sudo auditctl -l | grep 'umount' -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=-1 -F key=privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=-1 -F key=privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=-1 -F key=privileged-umount If both the "b32" and "b64" audit rules are not defined for the "umount" syscall, this is a finding. Note: The "key=" value is arbitrary and can be different from the example output above.

✔️ Fix
Configure SLEM 5 to generate an audit record for all uses of the "umount" and "umount2" system calls. Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=unset -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=unset -k privileged-umount To reload the rules file, restart the audit daemon: > sudo systemctl restart auditd.service or issue the following command: > sudo augenrules --load

✔️ Fix

Configure SLEM 5 to generate an audit record for all uses of the "umount" and "umount2" system calls. Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=unset -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=unset -k privileged-umount To reload the rules file, restart the audit daemon: > sudo systemctl restart auditd.service or issue the following command: > sudo augenrules --load