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Check: RHEL-09-411030

RHEL 9 STIG: RHEL-09-411030 (in versions v2 r3 through v1 r1)

Title

RHEL 9 duplicate User IDs (UIDs) must not exist for interactive users. (Cat II impact)

Discussion

To ensure accountability and prevent unauthenticated access, interactive users must be identified and authenticated to prevent potential misuse and compromise of the system. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062, SRG-OS-000042-GPOS-00020

Check Content

Verify that RHEL 9 contains no duplicate UIDs for interactive users with the following command: $ sudo awk -F ":" 'list[$3]++{print $1, $3}' /etc/passwd If output is produced and the accounts listed are interactive user accounts, this is a finding.

Fix Text

Edit the file "/etc/passwd" and provide each interactive user account that has a duplicate UID with a unique UID.

Additional Identifiers

Rule ID: SV-258045r958482_rule

Vulnerability ID: V-258045

Group Title: SRG-OS-000104-GPOS-00051

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000135	Generate audit records containing the organization-defined additional information that is to be included in the audit records.
CCI-000764	Uniquely identify and authenticate organizational users and associate that unique identification with processes acting on behalf of those users.
CCI-000804	Uniquely identify and authenticate non-organizational users or processes acting on behalf of non-organizational users.

Controls

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

Number	Title
AU-3(1)	Additional Audit Information
IA-2	Identification and Authentication (organizational Users)
IA-8	Identification and Authentication (non-organizational Users)