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The Photon operating system must configure Secure Shell (SSH) to disallow compression of the encrypted session stream.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-258878 | PHTN-40-000215 | SV-258878r933695_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 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide | 2023-10-29 |
Details
| Check Text ( C-62618r933693_chk ) |
|---|
| At the command line, run the following command to verify the running configuration of sshd: # sshd -T|&grep -i Compression Example result: compression no If there is no output or if "Compression" is not set to "delayed" or "no", this is a finding. |
| Fix Text (F-62527r933694_fix) |
|---|
| Navigate to and open: /etc/ssh/sshd_config Ensure the "Compression" line is uncommented and set to the following: Compression no At the command line, run the following command: # systemctl restart sshd.service |