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The ESXi host SSH daemon must not allow compression or must only allow compression after successful authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-93989 | ESXI-65-000021 | SV-104075r1_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 6.5 ESXi Security Technical Implementation Guide | 2019-10-01 |
Details
| Check Text ( C-93307r1_chk ) |
|---|
| From an SSH session connected to the ESXi host, or from the ESXi shell, 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-100237r1_fix) |
|---|
| From an SSH session connected to the ESXi host, or from the ESXi shell, add or correct the following line in "/etc/ssh/sshd_config": Compression no |