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December 27th > BIOS/UEFI > Flashcards

BIOS/UEFI Flashcards

1
Q

BIOS (Basic Input Output System):

A

A program stored in ROM that initializes hardware and manages data flow between the operating system (OS) and hardware.
Performs the Power-On Self-Test (POST) to check hardware functionality.
Stored settings are saved in CMOS (Complementary Metal Oxide Semiconductor).
Can be updated via a process called flashing.

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2
Q

UEFI (Unified Extensible Firmware Interface):

A

Modern replacement for traditional BIOS with enhanced features.

Supports graphical interfaces and mouse input.

Advantages over BIOS:
- 64-bit support.
-Larger storage support (up to 9.4 zettabytes).
- Faster boot times.
- Supports GPT (GUID Partition Table) for larger drives.
- Better diagnostic tools and functionality.

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3
Q

POST (Power-On Self-Test):

A

A diagnostic sequence verifying essential hardware like RAM, disk drives, and input/output devices.
Errors can halt the boot process and may produce beep codes indicating the issue.

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4
Q

Boot Process and Order:

A

BIOS/UEFI reads the configured boot order to locate an OS.
Boot devices include:
Hard disk drives (HDDs) and solid-state drives (SSDs).
Optical drives (CD/DVD/Blu-ray).
USB drives.
Network adapters (via PXE).

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5
Q

Flashing:

A

Process to update BIOS/UEFI firmware for security patches and feature enhancements.

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6
Q

BIOS and UEFI Security Features:

A

Passwords for BIOS/UEFI:

Secure Boot:

USB Port Restrictions:

Comparison of BIOS and UEFI:

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7
Q

Passwords for BIOS/UEFI:

A

Supervisor/Administrator/Setup Password: Protects access to BIOS/UEFI configuration settings. Common in corporate environments.
User/System Password: Locks access to the entire computer during boot. Typically used for personal computers.
Storage/Hard Drive Password: Secures access to specific drives. Less common due to TPM and HSM integration.

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8
Q

Secure Boot:

A
  • Supported only by UEFI, not BIOS.
  • Verifies the integrity of UEFI executables, OS loader, and boot-critical drivers during the boot process.
  • Prevents loading of malicious code, such as rootkits.
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9
Q

Comparison of BIOS and UEFI:

A

BIOS: Legacy firmware, uses MBR for boot information.
UEFI: Modern firmware with advanced security features, supports GPT for larger drives.

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10
Q

Hardware Root of Trust (ROT):

A
  • Foundation for secure computing operations.
  • Embedded cryptographic module ensures boot settings and metrics are trusted.
  • Includes keys for cryptographic functions to support a secure boot process.
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11
Q

Trusted Platform Module (TPM):

A

A hardware root of trust integrated into a system’s firmware.

Functions:

Ensures bootloader and OS kernel are not tampered with.

Stores encryption keys, digital certificates, password hashes.

Includes cryptographic capabilities:
- Random number generator.
- RSA key generator.
- SHA-1 hash generator.
- Encryption and decryption engine.

Used for full disk encryption (e.g., BitLocker).

Components:
- Endorsement Key (EK): Unique, hard-coded key.
- Storage Root Key (SRK): Secures stored data.
- Platform Configuration Registers (PCRs):Records system state.
- Attestation Identity Keys (AIKs): Used for trusted reporting.

Manageable via UEFI settings or OS tools (e.g., tpm.msc in Windows).

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12
Q

Hardware Security Module (HSM):

A

Appliance for securely generating and storing cryptographic keys.

Reduces risk of tampering and insider threats.

Form factors:
- Internal cards.
- Rack-mounted systems.
- IoT devices.
- USB-like devices with embedded keys.

Applications:
- Encryption/decryption of data.
- Secure access to storage devices.

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13
Q

Comparison of TPM and HSM:

A

TPM
- Purpose: Secure boot, disk encryption
- Integration: Embedded in firmware
- Form Factor: Chip on motherboard
- Key Management: Endorsement Key, SRK, A
HSM
- Purpose: Key generation and storage
- Integration: External or internal appliance
- Form Factor: Rack-mounted, USB-like, etc.
- Key Management: Encrypted storage keys

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14
Q

BIOS/UEFI Cooling Configuration:

A

The process of controlling and customizing fan behavior through the BIOS/UEFI interface.

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15
Q

BIOS Configuration

A
  1. Language Selection:
  2. System Summary:
  3. Setup Modes:
  4. Devices Configuration:
  5. Advanced Settings:
  6. Power Settings:
  7. Security Settings:
  8. Boot Options:
  9. Save or Reset Settings:
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16
Q

Language Selection:

A

Option to select the BIOS language (e.g., English, French).

17
Q

System Summary:

A

Displays system details:
CPU type, speed, and cores.
Installed memory size and bus speed.
Enabled/disabled devices (e.g., SATA drives, optical drives).

18
Q

Setup Modes:

A

Text Mode: Minimal visual interface.
Graphic Mode: For systems that support graphical BIOS.

19
Q

Devices Configuration:

A

Manage audio, video, network, USB, SATA, and Thunderbolt settings.
USB-specific configurations:
Disable all USB ports for maximum security.
Disable USB mass storage devices while allowing peripherals like keyboards and mice.

20
Q

Advanced Settings:

A

ACPI Settings:
Configure hibernation and sleep modes.
Adjust power button behavior (e.g., suspend to RAM).

CPU Configuration:
Enable/disable specific CPU cores.
Configure hyper-threading to improve performance.

Memory Configuration:
Support for ECC (Error-Correcting Code) memory.
Configure memory types (UDIMM vs. RDIMM).
Adjust memory channel modes (single, dual, triple, quad).

21
Q

Power Settings:

A

Adjust fan speeds:
Quiet Mode: Lower fan speed, higher temperatures.
Cool Mode: Higher fan speed, lower temperatures.
Balanced Mode: Moderate fan speed and temperature control.

22
Q

Security Settings:

A

Administrator Password: Restricts access to BIOS settings.
Power-On Password: Prevents unauthorized system boot.
Hard Disk Password: Secures specific drives.

23
Q

Boot Options:

A

Configure boot mode (Legacy or UEFI).
Adjust boot device priority (e.g., USB drives, SATA devices, network boot).
Disable boot options to secure the system.

24
Q

Save or Reset Settings:

A
  • Use F10 to save changes and reboot.
  • Use F9 to reset to factory defaults.
25
Q

UEFI Configuration

A
  1. Accessing UEFI:
  2. Key UEFI Features:
  3. Advanced UEFI Settings:
  4. Boot Options:
  5. Security Settings:
  6. Hardware Monitoring:
26
Q

Accessing UEFI:

A

Access UEFI by pressing a specific key (e.g., Delete, F2) during boot.
UEFI is a graphical interface that offers advanced configuration options compared to traditional BIOS.

27
Q

Key UEFI Features:

A

Settings: Basic system configuration (date, time, storage, etc.).
Overclocking Settings: Adjust CPU and memory performance at the risk of higher heat and potential hardware damage.
MFlash: Tool to flash the UEFI with updates for security, bug fixes, or new features.
OC Profile: Save and load specific UEFI configurations.
Hardware Monitor: Display system temperatures, fan speeds, and voltages.
Board Explorer: Visual representation of the motherboard showing connected components.

28
Q

Advanced UEFI Settings:

A

USB Configuration:
Legacy USB Support: Allows USB 3.0 ports to support older USB 1.0 and 2.0 devices but limits overall speed.
Integrated Peripherals:
Manage onboard devices like Wi-Fi and audio.
Configure SATA settings (e.g., AHCI mode, hot-plugging).
Overclocking:
Adjust CPU and memory speeds beyond their default ratings, risking instability and warranty voids.
Chassis Intrusion Detection:
Monitors and logs unauthorized case openings.

29
Q

Boot Options:

A

Configure boot priorities for hard drives, USB devices, network boot, etc.
Disable unused boot devices for security.

30
Q

Security Settings:

A

Administrator Password: Restricts access to UEFI settings.
User Password: Controls boot access.
U-Key: Creates a secure USB-based digital key for system access.
Trusted Computing: Configures TPM (Trusted Platform Module) for secure boot and encryption.

31
Q

Hardware Monitoring:

A

Displays real-time CPU, chipset, and system temperatures.
Shows fan speeds and voltage levels for critical components

32
Q

Key Differences of BIOS and UEFI

A

Interface: BIOS uses a simple text-based menu; UEFI offers a modern, graphical interface with mouse support.

Security: UEFI provides Secure Boot, Trusted Platform Module (TPM) integration, and chassis intrusion detection, enhancing system protection. BIOS lacks these advanced security features.

Storage and Boot: BIOS supports only MBR with a 2.2 TB limit per drive. UEFI supports GPT, enabling much larger drives and better scalability.

Customization and Monitoring: UEFI includes advanced customization options (e.g., overclocking profiles, fan controls) and detailed hardware monitoring, which are either limited or unavailable in BIOS.

Performance: UEFI has faster boot times due to its ability to initialize hardware more efficiently than BIOS.

December 27th (20 decks)

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