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V-252937

CAT I (High)

The root account must be the only account having unrestricted access to the TOSS system.

Rule ID

SV-252937r991589_rule

STIG

Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide

Version

V2R5

CCIs

CCI-000366

Discussion

If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricted access to the entire operating system. Multiple accounts with a UID of "0" afford an opportunity for potential intruders to guess a password for a privileged account.

Check Content

Check the system for duplicate UID "0" assignments with the following command:

$ sudo awk -F: '$3 == 0 {print $1}' /etc/passwd

If any accounts other than root have a UID of "0", this is a finding.

Fix Text

Change the UID of any account on the system, other than root, that has a UID of "0." 

If the account is associated with system commands or applications, the UID should be changed to one greater than "0" but less than "1000." Otherwise, assign a UID of greater than "1000" that has not already been assigned.