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V-274187

CAT II (Medium)

Amazon Linux 2023 audit system must protect logon user identifiers (UIDs) from unauthorized change.

Rule ID

SV-274187r1120715_rule

STIG

Amazon Linux 2023 Security Technical Implementation Guide

Version

V1R3

CCIs

CCI-000172, CCI-000162, CCI-000163, CCI-000164

Discussion

If modification of login UIDs is not prevented, they can be changed by nonprivileged users and make auditing complicated or impossible. Satisfies: SRG-OS-000462-GPOS-00206, SRG-OS-000475-GPOS-00220, SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Check Content

Verify Amazon Linux 2023 is configured so that the audit system prevents unauthorized changes to login UIDs with the following command:

$ sudo grep -i immutable /etc/audit/audit.rules
--loginuid-immutable

If the "--loginuid-immutable" option is not returned in the "/etc/audit/audit.rules", or the line is commented out, this is a finding.

Fix Text

Configure Amazon Linux 2023 auditing to prevent modification of login UIDs once they are set by adding the following line to /etc/audit/rules.d/audit.rules:

--loginuid-immutable

To load the rules to the kernel immediately, use the following command: 

$ sudo augenrules --load