Check: ESXI-67-000021
VMware vSphere 6.7 ESXi STIG:
ESXI-67-000021
(in versions v1 r3 through v1 r1)
Title
The ESXi host SSH daemon must not allow compression or must only allow compression after successful authentication. (Cat II impact)
Discussion
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.
Check Content
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
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
Additional Identifiers
Rule ID: SV-239276r674757_rule
Vulnerability ID: V-239276
Group Title: SRG-OS-000480-VMM-002000
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |