Nutanix AOS must enable an application firewall, if available.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254198	NUTX-OS-001110	SV-254198r846682_rule		Medium

Description
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

STIG	Date
Nutanix AOS 5.20.x OS Security Technical Implementation Guide	2022-08-24

Details

Check Text ( C-57683r846680_chk )
Confirm Nutanix AOS prohibits or restricts the use of remote access methods, using the iptables firewall service. $ sudo service iptables status iptables.service - IPv4 firewall with iptables Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled; vendor preset: disabled) Active: active (exited) since Mon 2021-08-02 15:02:12 CDT; 2 weeks 6 days ago Main PID: 1250 (code=exited, status=0/SUCCESS) CGroup: /system.slice/iptables.service If IPv6 is in use: $ sudo service ip6tables status ip6tables.service - IPv6 firewall with ip6tables Loaded: loaded (/usr/lib/systemd/system/ip6tables.service; enabled; vendor preset: disabled) Active: active (exited) since Mon 2021-08-02 15:02:12 CDT; 2 weeks 6 days ago Main PID: 1313 (code=exited, status=0/SUCCESS) CGroup: /system.slice/ip6tables.service If no iptables services are "Loaded" and "Active", this is a finding.

Check Text ( C-57683r846680_chk )

Confirm Nutanix AOS prohibits or restricts the use of remote access methods, using the iptables firewall service.

$ sudo service iptables status
iptables.service - IPv4 firewall with iptables
Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled; vendor preset: disabled)
Active: active (exited) since Mon 2021-08-02 15:02:12 CDT; 2 weeks 6 days ago
Main PID: 1250 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/iptables.service

If IPv6 is in use:
$ sudo service ip6tables status
ip6tables.service - IPv6 firewall with ip6tables
Loaded: loaded (/usr/lib/systemd/system/ip6tables.service; enabled; vendor preset: disabled)
Active: active (exited) since Mon 2021-08-02 15:02:12 CDT; 2 weeks 6 days ago
Main PID: 1313 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/ip6tables.service

If no iptables services are "Loaded" and "Active", this is a finding.

Fix Text (F-57634r846681_fix)
Configure the system to restrict the use of remote access methods by running the following command. $ sudo salt-call state.sls security/CVM/iptables/init