Title

All accounts on the system must have unique user or account names. (Cat II impact)

Discussion

A unique user name is the first part of the identification and authentication process. If user names are not unique, there can be no accountability on the system for auditing purposes. Multiple accounts sharing the same name could result in the Denial of Service to one or both of the accounts or unauthorized access to files or privileges.

Check Content

Check the system for duplicate account names. Example: # passwd -sa | sort | uniq -c | awk '$1 > 1 {print $2}' If any duplicate account names are found, this is a finding.

Fix Text

Change user account names, or delete accounts, so each account has a unique name.

Additional Identifiers

Rule ID: SV-227569r603266_rule

Vulnerability ID: V-227569

Group Title: SRG-OS-000104

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.