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The Photon operating system must configure sshd to disallow compression of the encrypted session stream.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-239161 | PHTN-67-000090 | SV-239161r675291_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. |
| STIG | Date |
|---|---|
| VMware vSphere 6.7 Photon OS Security Technical Implementation Guide | 2021-04-15 |
Details
| Check Text ( C-42372r675289_chk ) |
|---|
| At the command line, execute the following command: # sshd -T|&grep -i Compression Expected result: Compression no If the output does not match the expected result, this is a finding. |
| Fix Text (F-42331r675290_fix) |
|---|
| Open /etc/ssh/sshd_config with a text editor. Ensure that the "Compression" line is uncommented and set to the following: Compression no At the command line, execute the following command: # service sshd reload |