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

Verify the consistency of the assigned home directories in the authentication database. For Trusted Mode: # authck -av For SMSE: # pwck If any duplicate account names are found, this is a finding.

Fix Text

Determine if the duplicate accounts have the same or different UIDs. # cat /etc/passwd | cut -f 1,1 -d “:” | sort | uniq -d If the UIDs are different, the account name must be changed. If the UIDs are the same, disable/remove one of the two (or more) password file entries via the SAM/SMH interface.

Additional Identifiers

Rule ID: SV-38442r2_rule

Vulnerability ID: V-761

Group Title: GEN000300

Expert Comments

CCIs tied to check.

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