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Hardening Ubuntu 18 Laptop. What should I do differently?

I am trying to harden my Ubuntu 18 laptop and these are the steps I have taken so far: Physical Hardening: BIOS Settings: Secure boot enabled TPM enabled Mic disabled (never use it) Camera disabled (never use it) Bios passwords set…

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I am trying to harden my Ubuntu 18 laptop and these are the steps I have taken so far:

Physical Hardening:

BIOS Settings:

Secure boot enabled

TPM enabled

Mic disabled (never use it)

Camera disabled (never use it)

Bios passwords set

Passwords to boot:

BIOS Setup and Admin password - required to input at boot

GRUB Boot Menu Password - protects against attackers changing boot parameters and booting as root without password

Full Disk Decryption Password

User login password

All these passwords are memorized>

OS Settings:

Black listed camera driver - just extra precaution

Muted mic in alsamixer as root - extra precaution. Couldn't figure out how to disable driver.

USBGuard set to blacklist all usb devices by default. Individual devices must be manually given temporary access from root user.

Network Hardening:

Uncomplicated Firewall enabled

Incoming ICMP Pings dropped

SSH set to pubkey authentication only

Tor accessed via VPN for anonymous and private WAN connectivity when required

Account Hardening:

All web and application passwords are unique and at least 16 characters.

Memorized or written down in a physical notebook that only family has access to. (I trust my mum not to hack my Reddit account lol)

2FA enabled whenever available. Using authenticator apps.

Some issues I already know of are:

I should probably switch to physical 2FA, such as yubikey, rather than relying on an app.

The bootloader is still decrypted so that it can talk to the bios. I have secure boot enabled so changes to the bootloader will fail to boot. But the bios password can be disabled if the CMOS is reset, and then secure boot can be disabled. Once that happens my boot menu password could also be bypassed with changes to the bootloader. My drive is still encrypted but a very low level keylogger could be installed, making the encryption password useless. A good prevention is to move the bootloader off the drive and onto a secure usb that is on me at all times. I'm not sure how to do this without completely reinstalling my system. I have so many customizations that I really don't want to do that. And I would want to make a backup of the boot drive. Is that possible if am checking the boot drive's hash due to secure boot? Would the backup have the same hash?

USBGuard does not protect against all bad usb attacks, such as usb killers. But it certainly prevents a large percentage of attacks. I am not sure of any other bad usb preventions I can take.

Are there any other issues I am missing? Anything you recommend I do differently?

submitted by /u/purplecurtain16
[link] [comments]

1. Sofort-Triage & Abwehrmaßnahmen

SOC Incident Playbook: Remote Code Execution (RCE) Defense
Syntax validiert (0 Fehler)
title: Detect Exploitation - Hardening Ubuntu 18 Laptop. What should I do differently?
id: e7b2d523-8e86-4ddd-9e25-e1399e3d949f
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access
Syntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "Hardening Ubuntu 18 Laptop. Wh" ascii wide
    condition:
        any of them
}
Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Hardening Ubuntu 18 Laptop What should I")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count
Syntax validiert (0 Fehler)
message: "*Hardening Ubuntu 18 Laptop What should I*"
Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Hardening Ubuntu 18 Laptop What should I"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

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Command and Control
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Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Hardening Ubuntu 18 Laptop. What should .... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.

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