II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-VMM-002000
Group -
The ESXi host must verify certificates for SSL syslog endpoints.
When sending syslog data to a remote host, ESXi can be configured to use any combination of TCP, UDP, and SSL transports. When using SSL, the server certificate must be validated to ensure that the...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must enable volatile key destruction.
By default, pages allocated for virtual machines (VMs), userspace applications, and kernel threads are zeroed out at allocation time. ESXi will always ensure that no nonzero pages are exposed to VM...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must configure a session timeout for the vSphere API.
The vSphere API (VIM) allows for remote, programmatic administration of the ESXi host. Authenticated API sessions are no different from a risk perspective than authenticated UI sessions and they ne...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must be configured with an appropriate maximum password age.
The older an ESXi local account password is, the larger the opportunity window is for attackers to guess, crack or reuse a previously cracked password. Rotating passwords on a regular basis is a fu...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi Common Information Model (CIM) service must be disabled.
The CIM system provides an interface that enables hardware-level management from remote applications via a set of standard application programming interfaces (APIs). These APIs are consumed by exte...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must use DOD-approved certificates.
The default self-signed host certificate issued by the VMware Certificate Authority (VMCA) must be replaced with a DOD-approved certificate when the host will be accessed directly, such as during a...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host Secure Shell (SSH) daemon must disable port forwarding.
While enabling Transmission Control Protocol (TCP) tunnels is a valuable function of sshd, this feature is not appropriate for use on the ESXi hypervisor.Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host OpenSLP service must be disabled.
OpenSLP implements the Service Location Protocol to help CIM clients discover CIM servers over TCP 427. This service is not widely needed and has had vulnerabilities exposed in the past. To reduce ...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must enable audit logging.
ESXi offers both local and remote audit recordkeeping to meet the requirements of the NIAP Virtualization Protection Profile and Server Virtualization Extended Package. Local records are stored on ...Rule Medium Severity -
SRG-OS-000342-VMM-001230
Group -
The ESXi host must off-load audit records via syslog.
ESXi offers both local and remote audit recordkeeping to meet the requirements of the NIAP Virtualization Protection Profile and Server Virtualization Extended Package. Local records are stored on ...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must enable strict x509 verification for SSL syslog endpoints.
When sending syslog data to a remote host via SSL, the ESXi host is presented with the endpoint's SSL server certificate. In addition to trust verification, configured elsewhere, this "x509-strict"...Rule Medium Severity -
SRG-OS-000037-VMM-000150
Group -
The ESXi host must forward audit records containing information to establish what type of events occurred.
Without establishing what types of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be n...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must not be configured to override virtual machine (VM) configurations.
Each VM on an ESXi host runs in its own "vmx" process. Upon creation, a vmx process will look in two locations for configuration items, the ESXi host itself and the per-vm *.vmx file in the VM stor...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must not be configured to override virtual machine (VM) logger settings.
Each VM on an ESXi host runs in its own "vmx" process. Upon creation, a vmx process will look in two locations for configuration items, the ESXi host itself and the per-vm *.vmx file in the VM stor...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must require TPM-based configuration encryption.
An ESXi host's configuration consists of configuration files for each service that runs on the host. The configuration files typically reside in the /etc/ directory, but they can also reside in oth...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must configure the firewall to restrict access to services running on the host.
Unrestricted access to services running on an ESXi host can expose a host to outside attacks and unauthorized access. Reduce the risk by configuring the ESXi firewall to only allow access from auth...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host when using Host Profiles and/or Auto Deploy must use the vSphere Authentication Proxy to protect passwords when adding themselves to Active Directory.
If a host is configured to join an Active Directory domain using Host Profiles and/or Auto Deploy, the Active Directory credentials are saved in the profile and are transmitted over the network. T...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must not use the default Active Directory ESX Admin group.
When adding ESXi hosts to Active Directory, all user/group accounts assigned to the Active Directory group "ESX Admins" will have full administrative access to the host. If this group is not contr...Rule Medium Severity -
SRG-OS-000341-VMM-001220
Group -
The ESXi host must configure a persistent log location for all locally stored logs.
ESXi can be configured to store log files on an in-memory file system. This occurs when the host's "/scratch" directory is linked to "/tmp/scratch". When this is done, only a single day's worth of ...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must enforce the exclusive running of executables from approved VIBs.
The "execInstalledOnly" advanced ESXi boot option, when set to TRUE, guarantees that the VMkernel executes only those binaries that have been packaged as part of a signed VIB. While this option is ...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must use sufficient entropy for cryptographic operations.
Starting in vSphere 8.0, the ESXi Entropy implementation supports the FIPS 140-3 and EAL4 certifications. Kernel boot options control which entropy sources to activate on an ESXi host. In computin...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must not enable log filtering.
The log filtering capability allows users to modify the logging policy of the syslog service that is running on an ESXi host. Users can create log filters to reduce the number of repetitive entries...Rule Medium Severity -
SRG-OS-000033-VMM-000140
Group -
The ESXi host must use DOD-approved encryption to protect the confidentiality of network sessions.
Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. In ESXi 8.0 Update 3 and newer TLS profiles are availab...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must disable key persistence.
When using a standard key provider, the ESXi host relies on vCenter Server to manage the encryption keys. When using a trusted key provider, the ESXi host relies directly on the Trust Authority Hos...Rule Medium Severity -
SRG-OS-000480-VMM-002000
Group -
The ESXi host must deny shell access for the dcui account.
The dcui user is used for process isolation for the DCUI itself. The account has shell access which can be deactivated to reduce attack surface.Rule Medium Severity
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