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7.2.4 Ensure no duplicate UIDs exist

Information

Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passwd file and change the UID field.

Users must be assigned unique UIDs for accountability and to ensure appropriate access protections.

Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062, SRG-OS-000042-GPOS-00020

Solution

Based on the results of the audit script, establish unique UIDs and review all files owned by the shared UIDs to determine which UID they are supposed to belong to.

See Also

https://workbench.cisecurity.org/benchmarks/21095

Item Details

Category: CONFIGURATION MANAGEMENT, IDENTIFICATION AND AUTHENTICATION

References: 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|IA-5

Plugin: Unix

Control ID: d51e990f73f4bc7cff2f17b71b4321c58941c64222798639eaa628ea3ee7810a