All Automation Controller NGINX web server accounts accessing the directory tree, the shell, or other operating system functions and utilities must only be administrative accounts.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256954	SRG-APP-000211-WSR-000030	APWS-AT-000440	SV-256954r961095_rule	2024-08-27	2

Description
AIT is important to limit access to Automation Controller nginx web servers and provide access on a need-to-know basis. For example, only System Administrators must have access to all the system's capabilities, while the web administrator and associated staff require access and control of the web content and Automation Controller NGINX web server configuration files. Without close monitoring and control over access to the web server and its resources, there is the risk of unskilled personnel making mistakes, and a risk of characters performing malicious acts.

Description

AIT is important to limit access to Automation Controller nginx web servers and provide access on a need-to-know basis. For example, only System Administrators must have access to all the system's capabilities, while the web administrator and associated staff require access and control of the web content and Automation Controller NGINX web server configuration files. Without close monitoring and control over access to the web server and its resources, there is the risk of unskilled personnel making mistakes, and a risk of characters performing malicious acts.

ℹ️ Check
As a system administrator for each Automation Controller NGINX web server host, enumerate all (nonroot) privileged users on the system: allowed_privileged_users=('root') ; echo "${allowed_privileged_users}" \| tr ' ' '\n' >/tmp/allowed_privileged_users ; getent passwd \| cut -f1 -d ':' \| sudo xargs -L1 sudo -l -U \| grep -v 'not allowed' \| tail -n +3 \| sed -n '/^User/s/User\s\(\w\).*/\1/p' \| grep -v -f /tmp/allowed_privileged_users 1>/dev/null && echo "FAILED" ; rm -f /tmp/allowed_privileged_users If "FAILED" is displayed, this is a finding.

ℹ️ Check

As a system administrator for each Automation Controller NGINX web server host, enumerate all (nonroot) privileged users on the system: allowed_privileged_users=('root') ; echo "${allowed_privileged_users}" | tr ' ' '\n' >/tmp/allowed_privileged_users ; getent passwd | cut -f1 -d ':' | sudo xargs -L1 sudo -l -U | grep -v 'not allowed' | tail -n +3 | sed -n '/^User/s/User\s*$\w*$.*/\1/p' | grep -v -f /tmp/allowed_privileged_users 1>/dev/null && echo "FAILED" ; rm -f /tmp/allowed_privileged_users If "FAILED" is displayed, this is a finding.

✔️ Fix
As a System Administrator for each Automation Controller NGINX web server host, enumerate all (nonroot) privileged users on the system: getent passwd \| cut -f1 -d ':' \| sudo xargs -L1 sudo -l -U \| grep -v 'not allowed' \| tail -n +3 \| sed -n '/^User/s/User\s\(\w\).*/\1/p' \| grep -v root For each user shown, perform one of the following actions: - Remove the indicated user from the system; - Remove the indicated user from any privileged groups (wheel); - Remove login access for the user; - Verify via organizationally defined procedures the indicated user is an authorized administrative account.

✔️ Fix

As a System Administrator for each Automation Controller NGINX web server host, enumerate all (nonroot) privileged users on the system: getent passwd | cut -f1 -d ':' | sudo xargs -L1 sudo -l -U | grep -v 'not allowed' | tail -n +3 | sed -n '/^User/s/User\s*$\w*$.*/\1/p' | grep -v root For each user shown, perform one of the following actions: - Remove the indicated user from the system; - Remove the indicated user from any privileged groups (wheel); - Remove login access for the user; - Verify via organizationally defined procedures the indicated user is an authorized administrative account.