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V-762

CAT II (Medium)

All accounts must be assigned unique User Identification Numbers (UIDs).

Rule ID

SV-44821r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000764

Discussion

Accounts sharing a UID have full access to each others' files. This has the same effect as sharing a login. There is no way to assure identification, authentication, and accountability because the system sees them as the same user. If the duplicate UID is 0, this gives potential intruders another privileged account to attack.

Check Content

Perform the following to ensure there are no duplicate UIDs:
# pwck -r
If any duplicate UIDs are found, this is a finding.

Fix Text

Edit user accounts to provide unique UIDs for each account.