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The OL 8 SSH daemon must not allow compression or must only allow compression after successful authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-248604 | OL08-00-010510 | SV-248604r779378_rule | Medium |
| Description |
|---|
| If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges. |
| STIG | Date |
|---|---|
| Oracle Linux 8 Security Technical Implementation Guide | 2021-07-21 |
Details
| Check Text ( C-52038r779376_chk ) |
|---|
| Verify the SSH daemon performs compression after a user successfully authenticates with the following command: $ sudo grep -i compression /etc/ssh/sshd_config Compression delayed If the "Compression" keyword is set to "yes" or is missing, or if the returned line is commented out, this is a finding. |
| Fix Text (F-51992r779377_fix) |
|---|
| Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" on the system (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 "delayed" or "no": Compression no The SSH service must be restarted for changes to take effect. |