The answer is running the service as root, because a systemd service executing a script with root privileges introduces a critical privilege escalation vector. The core security concern is that any vulnerability within the patching script—such as command injection, improper input validation, or a path traversal flaw—immediately grants an attacker full system control. On the CompTIA SecurityX CAS-004 exam, this scenario tests your understanding of the principle of least privilege and secure service configuration, often appearing in questions about system hardening or automation risks. A common trap is focusing on the script’s purpose (patching) rather than the excessive permissions granted to run it. To remember this, think: “Root for a script is a root for an attacker.” Always configure systemd services to run under a dedicated, non-privileged user account with only the specific capabilities needed for the task, such as write access to the patch directory, rather than blanket root access.
CAS-004 Scripting, Containers and Automation Practice Question
This CAS-004 practice question tests your understanding of scripting, containers and automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
[Unit]
Description=Auto-patch service
After=network.target
[Service]
ExecStart=/usr/local/bin/patch.sh
Restart=on-failure
User=root
Refer to the exhibit. A system administrator creates a systemd service to run a daily patching script. Which security concern is most prevalent?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The script runs as root
Running the service as root grants the script full system privileges. If the patching script has vulnerabilities, an attacker could gain root access. Running as a non-root user with required permissions is better.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The service restarts on failure
Why it's wrong here
Restart on failure is a reliability feature, not a security concern.
✗
The script location is non-standard
Why it's wrong here
/usr/local/bin is a standard location for local scripts.
✗
The service depends on the network
Why it's wrong here
Network dependency is functional, not inherently insecure.
✓
The script runs as root
Why this is correct
Executing automation as root increases blast radius; privilege separation is recommended.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The script runs as root — Running the service as root grants the script full system privileges. If the patching script has vulnerabilities, an attacker could gain root access. Running as a non-root user with required permissions is better.
What should I do if I get this CAS-004 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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