The SUSE operating system must generate audit records for all uses of the umount system call.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-234935	SLES-15-030360	SV-234935r622137_rule		Low

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. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

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. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

STIG	Date
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide	2021-11-30

Details

Check Text ( C-38123r619074_chk )
Verify the SUSE operating system generates an audit record for all uses of the "umount" and "umount2" system calls. Check that the system calls are being audited by performing the following command: > sudo auditctl -l \| grep 'umount' -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=-1 -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=-1 -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=-1 -k privileged-umount If both the "b32" and "b64" audit rules are not defined for the "umount" syscall, this is a finding. Note: The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.

Check Text ( C-38123r619074_chk )

Verify the SUSE operating system generates an audit record for all uses of the "umount" and "umount2" system calls.

Check that the system calls are being audited by performing the following command:

> sudo auditctl -l | grep 'umount'

-a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=-1 -k privileged-umount
-a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=-1 -k privileged-umount
-a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=-1 -k privileged-umount

If both the "b32" and "b64" audit rules are not defined for the "umount" syscall, this is a finding.

Note:
The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.

Fix Text (F-38086r619075_fix)
Configure the SUSE operating system to generate an audit record for all uses of the "umount" and "umount2" system calls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=4294967295 -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 Text (F-38086r619075_fix)

Configure the SUSE operating system to generate an audit record for all uses of the "umount" and "umount2" system calls.

Add or update the following rules to "/etc/audit/rules.d/audit.rules":

-a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=4294967295 -k privileged-umount
-a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount
-a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=4294967295 -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