ESXI-70-000021 - The ESXi host Secure Shell (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 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_7-0_Y23M07_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-256390r885951_rule, STIG-ID|ESXI-70-000021, Vuln-ID|V-256390

Plugin: Unix

Control ID: 2dbe8cc1d8f8724139c07713009b34908c4f12b94df74b25f8d1a07aea6da8cd