ESXI-67-000021 - The ESXi host SSH daemon must not allow compression or must only allow compression after successful authentication.

Information

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.

Solution

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

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_6-7_Y22M04_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-239276r674757_rule, STIG-ID|ESXI-67-000021, Vuln-ID|V-239276

Plugin: Unix

Control ID: 392e4644979dd7446cc2beb841289ee454eaf38497cf200427566164f7805f4f