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The Oracle Linux operating system must be configured so that the SSH daemon performs strict mode checking of home directory configuration files.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-221862 | OL07-00-040450 | SV-221862r603260_rule | Medium |
| Description |
|---|
| If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user. |
| STIG | Date |
|---|---|
| Oracle Linux 7 Security Technical Implementation Guide | 2021-06-14 |
Details
| Check Text ( C-23577r419658_chk ) |
|---|
| Verify the SSH daemon performs strict mode checking of home directory configuration files. The location of the "sshd_config" file may vary if a different daemon is in use. Inspect the "sshd_config" file with the following command: # grep -i strictmodes /etc/ssh/sshd_config StrictModes yes If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding. |
| Fix Text (F-23566r419659_fix) |
|---|
| Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "yes": StrictModes yes The SSH service must be restarted for changes to take effect. |