The ESXi host Secure Shell (SSH) daemon must not allow compression or must only allow compression after successful authentication.
An XCCDF Rule
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.
- ID
- SV-256390r959010_rule
- Version
- ESXI-70-000021
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":
Compression no