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UIDs reserved for system accounts must not be assigned to non-system accounts.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-11946 | GEN000340 | SV-37155r1_rule | ECSC-1 | Medium |
| Description |
|---|
| Reserved UIDs are typically used by system software packages. If non-system accounts have UIDs in this range, they may conflict with system software, possibly leading to the user having permissions to modify system files. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2013-04-10 |
Details
| Check Text ( C-35863r2_chk ) |
|---|
| Check the UID assignments for all accounts. # cut -d: -f 1,3 /etc/passwd | egrep ":[1-4][0-9]{2}$|:[0-9]{1,2}$" Confirm all accounts with a UID of 499 and below are used by a system account. If a UID reserved for system accounts (0 - 499) is used by a non-system account, then this is a finding. |
| Fix Text (F-31119r1_fix) |
|---|
| Change the UID numbers for non-system accounts with reserved UIDs (those less or equal to 499). |