Default operating system accounts, other than root, must be locked.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-50731	OL6-00-000029	SV-64937r3_rule		Medium

Description
Disabling authentication for default system accounts makes it more difficult for attackers to make use of them to compromise a system.

STIG	Date
Oracle Linux 6 Security Technical Implementation Guide	2020-05-15

Details

Check Text ( C-53211r2_chk )
To obtain a listing of all users and the contents of their shadow password field, run the command: $ awk -F: '$1 !~ /^root$/ && $2 !~ /^[!*]/ {print $1 ":" $2}' /etc/shadow Identify the operating system accounts from this listing. These will primarily be the accounts with UID numbers less than 500, other than root. If any default operating system account (other than root) has a valid password hash, this is a finding.

Check Text ( C-53211r2_chk )

To obtain a listing of all users and the contents of their shadow password field, run the command:

$ awk -F: '$1 !~ /^root$/ && $2 !~ /^[!*]/ {print $1 ":" $2}' /etc/shadow

Identify the operating system accounts from this listing. These will primarily be the accounts with UID numbers less than 500, other than root. If any default operating system account (other than root) has a valid password hash, this is a finding.

Fix Text (F-55527r2_fix)
Some accounts are not associated with a human user of the system, and exist to perform some administrative function. An attacker should not be able to log into these accounts. Disable logon access to these accounts with the command: # passwd -l [SYSACCT]