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GIDs reserved for system accounts must not be assigned to non-system groups.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-780 | GEN000360 | SV-63299r1_rule | ECSC-1 | Medium |
| Description |
|---|
| Reserved GIDs are typically used by system software packages. If non-system groups have GIDs in this range, they may conflict with system software, possibly leading to the group having permissions to modify system files. |
| STIG | Date |
|---|---|
| Oracle Linux 5 Security Technical Implementation Guide | 2015-03-26 |
Details
| Check Text ( C-52003r1_chk ) |
|---|
| Confirm all accounts with a GID of 499 and below are used by a system account. Procedure: List all the users with a GID of 0-499. # cut -d: -f 1,4 /etc/passwd|egrep ":[1-4][0-9]{2}$|:[0-9]{1,2}$" If a GID reserved for system accounts (0 - 499) is used by a non-system account, this is a finding. |
| Fix Text (F-53887r1_fix) |
|---|
| Change the primary group GID numbers for non-system accounts with reserved primary group GIDs (those less or equal to 499). |