Amazon Linux 2023 must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.

In addition to auditing new user and group accounts, these watches will alert the system administrator(s) (SAs) to any modifications. Any unexpected users, groups, or modifications should be investigated for legitimacy.

Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000062-GPOS-00031, SRG-OS-000304-GPOS-00121, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000470-GPOS-00214, SRG-OS-000471-GPOS-00215, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000466-GPOS-00210, SRG-OS-000476-GPOS-00221, SRG-OS-000274-GPOS-00104, SRG-OS-000275-GPOS-00105, SRG-OS-000276-GPOS-00106, SRG-OS-000277-GPOS-00107

Verify Amazon Linux 2023 generates audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd" with the following command:

$ sudo auditctl -l | egrep '(/etc/passwd)' -w /etc/passwd -p wa -k identity

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

Configure Amazon Linux 2023 to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd".

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

-w /etc/passwd -p wa -k identity

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

$ sudo augenrules --load