3.5 Given a scenario, apply server hardening methods.

📘CompTIA Server+ (SK0-005)

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1. Disable Unneeded Hardware

What it means

Servers often include hardware components that are not required for their role. These can include:

• Integrated Wi-Fi or Bluetooth
• Unused network interface cards (NICs)
• Audio devices
• USB controllers
• Optical drives (CD/DVD)

Why it is important

• Reduces attack surface
• Prevents unauthorized access through unused components
• Improves performance and stability

How it is done

This is typically configured in the BIOS/UEFI settings or via server management tools.

Exam Key Points

• Disabling unused hardware reduces vulnerabilities
• Limits entry points for attackers
• Common in secure server environments where minimal functionality is required

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2. Disable Unneeded Physical Ports, Devices, or Functions

What it means

Physical ports are external connection points such as:

• USB ports
• Ethernet ports (if not required)
• Serial ports
• FireWire ports (rare but still possible)

Devices may also include:

• External storage interfaces
• Peripheral ports that are not in use

Why it is important

• Prevents unauthorized data transfer using removable devices
• Protects against malicious hardware connections
• Stops data exfiltration (unauthorized copying of data)

Common Example in IT Environment

• Disabling USB ports on a database server to prevent data being copied onto external drives
• Disabling unused network ports on a server to limit access points

How it is done

• BIOS/UEFI settings
• Operating system-level controls
• Physical port blockers (in high-security environments)

Exam Key Points

• Physical port security helps prevent data theft and malware injection
• Used in environments with strict security policies (e.g., data centers, financial systems)

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3. Set BIOS Password

What it means

A BIOS/UEFI password protects access to the firmware settings of the server.

There are two main types:

• Setup Password – Prevents unauthorized changes to BIOS settings
• Power-On Password – Prevents the system from booting without authentication

Why it is important

• Prevents unauthorized users from:
  • Changing boot order
  • Enabling/disabling hardware
  • Modifying security settings
• Protects against boot-level attacks

What attackers could do without it

• Boot from external media and bypass OS security
• Install malware before the OS loads

How it is used in IT environments

• Set by system administrators on all production servers
• Restricted access to BIOS/UEFI settings ensures only authorized changes

Exam Key Points

• BIOS password protects firmware-level access
• Prevents unauthorized configuration changes
• Important for physical security of servers

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4. Set Boot Order

What it means

Boot order determines the sequence of devices the system checks when starting up.

Example boot order:

1. Internal hard drive (OS)
2. Network boot (PXE)
3. USB drive
4. Optical drive

Why it is important

• Prevents unauthorized booting from external devices
• Ensures the system always boots into the trusted operating system

Security Risk Without Proper Configuration

If boot order is not secured:

• An attacker could boot from a USB device
• Bypass the operating system login
• Access or modify data on the server

Best Practice

• Set boot order to only trusted devices (e.g., internal disk)
• Disable boot from:
  • USB
  • CD/DVD
  • External network (unless required)

Exam Key Points

• Boot order controls how the system starts
• Should be configured to prevent booting from unauthorized media
• Often combined with BIOS password for full protection

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5. How These Controls Work Together

Hardware hardening is most effective when all these measures are combined:

• Disable unneeded hardware → Reduces system complexity and vulnerabilities
• Disable unneeded ports → Prevents physical attacks and data leakage
• BIOS password → Secures firmware settings
• Boot order control → Ensures trusted system startup

Together, they protect the server from:

• Unauthorized physical access
• Boot-level attacks
• Hardware-based exploitation

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6. Exam Tips (Important for Passing)

• Know that hardware hardening occurs before the operating system loads
• Understand BIOS/UEFI security settings
• Be able to identify:
  • What to disable
  • Why it is disabled
• Remember:
  • BIOS password = protects settings
  • Boot order = controls startup process
  • Disabling hardware/ports = reduces attack surface

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7. Quick Summary

Hardware hardening strengthens server security by:

• Disabling unnecessary hardware and ports
• Preventing unauthorized physical access
• Protecting BIOS/UEFI settings with a password
• Controlling boot order to ensure secure startup

These steps are essential to protect servers from physical attacks and low-level system compromise, which is a key topic in the Server+ exam.