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The SSH daemon must not allow compression or must only allow compression after successful authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-63211 | ESXI-06-000021 | SV-77701r1_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 |
|---|---|
| VMware vSphere ESXi 6.0 Security Technical Implementation Guide | 2017-01-06 |
Details
| Check Text ( C-63945r1_chk ) |
|---|
| To verify the Compression setting, run the following command: # grep -i "^Compression" /etc/ssh/sshd_config If there is no output or the output is not exactly "Compression no", this is a finding. |
| Fix Text (F-69129r1_fix) |
|---|
| To set the Compression setting, add or correct the following line in "/etc/ssh/sshd_config": Compression no |