Cách hạn chế rủi ro bảo mật cho dịch vụ bằng tường lửa trong mạng IPv4/IPv6 duplex. Bật IPv6 GUA có thể để lộ dịch vụ, sử dụng firewalld + cấu hình rich rules để chặn truy cập qua GUA, chỉ cho phép localhost (::1) và địa chỉ link-local (fe80). Kết hợp Avahi, Systemd-resolved để ưu tiên DNS địa phương. Bảo vệ proxy HTTPS cổng 443. #linuxsecurity #đualstack #防火墙 #网络配置 #docker #bảo_mật_servet

https://www.reddit.com/r/selfhosted/comments/1pn1g3s/rich_firewall_rules_to_secure_your_services_in/

Kicksecure delivers a deeply hardened Linux environment with security-focused configurations applied by default. It’s built for users who demand verified protection from the ground up.

#Kicksecure #SecurityHardened #LinuxSecurity #SecureByDesign #CyberProtection

BpfJailer: eBPF Mandatory Access Control [pdf]

https://lpc.events/event/19/contributions/2159/attachments/1833/3929/BpfJailer%20LPC%202025.pdf

#HackerNews #BpfJailer #eBPF #Mandatory #Access #Control #pdf #LinuxSecurity #eBPF #Hacking

[Dark Reading Virtual Event] Cybersecurity Outlook 2026
Aggregated from www.darkreading.com.Read the full article →
https://sudoaptchat.com/dark-reading-virtual-event-cybersecurity-outlook-2026/
#LinuxSecurity

How much RAM does your PC actually need in 2025? A Windows and Mac expert weighs in
Aggregated from www.zdnet.com.Thinking about upgrading your slow PC? Are you unsure how much RAM you actually need? Here's what this tech reviewer thinks.
Read the full article →
https://sudoaptchat.com/how-much-ram-does-your-pc-actually-need-in-2025-a-windows-and-mac-expert-weighs-in/
#LinuxSecurity

Landlock-Ing Linux

https://blog.prizrak.me/post/landlock/

#HackerNews #Landlock #Linux #LinuxSecurity #OpenSource #TechNews #Cybersecurity

Server Security Checklist — Essential Hardening Guide

Securing your servers isn’t optional — it’s your first line of defense against data breaches, ransomware, insider threats, and lateral movement. Use this checklist as a baseline for Linux, Windows, cloud, hybrid, or on-prem servers.

⸻

🔧 1. System & OS Hardening
• Keep OS & packages updated (apply security patches frequently).
• Remove / disable unused services & software.
• Enforce secure boot + BIOS/UEFI passwords.
• Disable auto-login and guest accounts.
• Use minimal OS images only (reduce attack surface).

⸻

🔐 2. Access Control
• Enforce strong passwords & MFA everywhere.
• Use RBAC & least privilege access.
• Disable root/Administrator login over SSH/RDP.
• Rotate credentials & keys regularly.
• Implement just-in-time access for privileged users.

⸻

🌐 3. Network Security
• Restrict inbound/outbound traffic via firewalls.
• Segment critical servers from general LANs/VLANs.
• Disable unused ports & protocols.
• Enable DoS/DDoS protection.
• Apply zero-trust network principles.

⸻

🔑 4. Secure Remote Access
• Use SSH key-based authentication (disable password login).
• Enforce VPN for admin access.
• Log & monitor all remote access sessions.
• Disable legacy protocols (Telnet, FTP, SMBv1).
• Require bastion/jump host for critical access.

⸻

📊 5. Logging & Monitoring
• Enable centralized logging (syslog / SIEM).
• Track failed login attempts & anomalies.
• Configure alerts for privilege escalation or config changes.
• Monitor log tampering.
• Retain logs securely for audits & forensics.

⸻

🔒 6. Data Protection
• Encrypt data at rest (LUKS, BitLocker, etc.).
• Encrypt data in transit (TLS 1.2+).
• Strict database access policies.
• Regular, offline, immutable backups.
• Test restore procedures (don’t assume backups work).

⸻

🔁 7. Application & Patch Management
• Keep middleware, frameworks, and apps patched.
• Delete default credentials & sample files.
• Enable code signing for software packages.
• Use secure coding practices (OWASP Top 10).
• Implement dependency scanning (Snyk, Trivy, etc.).

⸻

🛡️ 8. Malware & Intrusion Defense
• Deploy EDR/AV on endpoints.
• Enable IDS/IPS at network edge.
• Automatic vulnerability scans (schedule weekly/monthly).
• Monitor persistence techniques (cron, startup scripts).
• Block known malicious IP ranges & TLDs.

⸻

🏢 9. Physical & Cloud Security
• Restrict physical access to server racks/rooms.
• Enable provider security tools (AWS Security Groups, Azure NSG, IAM).
• Harden cloud images (CIS benchmarks).
• Review cloud logging & audit trails regularly.
• Disable unused cloud API keys / roles.

⸻

📜 10. Policy & Compliance
• Use CIS / NIST / ISO-27001 benchmarks.
• Track & document every access change.
• Force annual access reviews & key rotation.
• Perform regular security training for admins.
• Maintain disaster recovery & incident plans.

⸻

➕ Additional 5 Critical Controls (Advanced Hardening)

🧠 11. Privileged Access Management (PAM)
• Use jump hosts & session recording.
• Just-In-Time access for admins.
• Store keys in secure vaults (HashiCorp Vault, CyberArk).

🚨 12. Real-Time Threat Detection
• Use behavioral analytics → UEBA/XDR.
• AI-based anomaly detection recommended.
• Block suspicious IPs automatically.

🧪 13. Red Team & Pentesting
• Run regular internal pentests.
• Validate configuration weaknesses.
• Simulate phishing + lateral movement scenarios.

🧱 14. Container / VM Isolation
• Use AppArmor, SELinux, Seccomp profiles.
• Limit Docker socket access & root containers.
• Scan images before deployment.

📦 15. Automated Configuration Management
• Use IaC (Terraform, Ansible, Puppet) for repeatable and secure builds.
• Detect drift using compliance scanning.
• Version control all infrastructure.

⸻

🧠 Core Reminder

A server is only as secure as the team who maintains it.
Hardening isn’t one task — it’s an ongoing

#ServerSecurity #SystemHardening #InfoSec #CyberSecurity #BlueTeam
#DevSecOps #SysAdmin #ThreatDetection #AccessControl #NetworkSecurity
#LinuxSecurity #SecureArchitecture #RiskMitigation #SecurityChecklist
#CloudSecurity #InfrastructureSecurity #ZeroTrust #SecurityMonitoring

Had some great feedback last week after my #systemd presentation named "Linux speedrun: systemd". It gave me some new inspiration and energy to research a few more tools in-depth. I will be updating my blog (Linux-audit.com) and prepare some scripts for the upcoming videos. So thanks all!

Missed the presentation? It's online at https://michaelboelen.com/presentations/ (80+ slides). Also have a look at "Sandboxing using the Linux kernel and systemd" if you are interested.

#Linux #LinuxSecurity

Always excited to see my own tool (Lynis) showing up in videos of others!

https://youtu.be/qtzlszWN6Nw

#LinuxSecurity #linuxtool #Linux

The Next Wave of Supply Chain Attacks: NPM, PyPI, and Docker Hub Incidents Set the Stage for 2026
Aggregated from linuxsecurity.com.When npm was hit in September, it was tempting to see it as an isolated supply chain attack. A maintainer fell for a phish, popular packages were swapped out, and downstream projects scrambled. But npm wasn't the only ecosyst
http://sudoaptchat.com/the-next-wave-of-supply-chain-attacks-npm-pypi-and-docker-hub-incidents-set-the-stage-for-2026/
#LinuxSecurity

Advanced Security Isn't Stopping Ancient Phishing Tactics
Aggregated from www.darkreading.com.New research reveals that sophisticated phishing attacks consistently bypass traditional enterprise security measures.
Read the full article →
http://sudoaptchat.com/advanced-security-isnt-stopping-ancient-phishing-tactics/
#LinuxSecurity

ds-wireguard is now public.

A disciplined WireGuard role for Ansible-strict key handling, clean routing, zero guesswork.

Silent. Minimal. Predictable.

Code: https://github.com/DeadSwitch404/ds-wireguard

#Ansible #WireGuard #VPN #DevSecOps #GhostWare #LinuxSecurity #DeadSwitch #Automation #IaC #Role

Roaming authenticators offer what other passkey solutions can't – but there are trade-offs
Aggregated from www.zdnet.com.The most secure passkey authenticator could be a physical device - here's why.
Read the full article →
https://sudoaptchat.com/roaming-authenticators-offer-what-other-passkey-solutions-cant-but-there-are-trade-offs/
#LinuxSecurity

Wir zeigen dir in unserem neuen Leitfaden, wie dein Arch Linux mit klaren, praxistauglichen Schritten wirklich sicher wird: Von sauber geregelten Benutzerrechten über verschlüsselte LUKS-Partitionen bis hin zu einer soliden SSH-Konfiguration mit Key-Authentifizierung und ein professioneller Monitoring-Ansatz, der verdächtige Aktivitäten zuverlässig sichtbar macht.

https://admindocs.de/arch-linux-serie/arch-linux-systemhartung-und-sicherheit.shtml

#Linux #Sysadmin #LinuxSecurity #ArchLinux #SystemAdministration #LinuxAdmin #DevOps

[Dark Reading Virtual Event] Know Your Enemy: How cybercriminals and nation-state hackers operate
Aggregated from www.darkreading.com.Read the full article →
http://sudoaptchat.com/dark-reading-virtual-event-know-your-enemy-how-cybercriminals-and-nation-state-hackers-operate/
#LinuxSecurity

Kaspersky for Linux is here but you should NOT trust it

https://fed.brid.gy/r/https://nerds.xyz/2025/11/kaspersky-linux/

In steps closer to starting my Linux channel. Preparations are fully underway, like creating thumbnails. Learning along the way, so it takes a few weeks. Still, making good progress 🚀

Interested in #Linux 🐧, #OpenSource, or #LinuxSecurity, #selfhosting? Then consider following the new project.

The name? Linux Lorem!

Website: https://linuxlorem.com/

If you use YouTube, consider subscribing already: https://www.youtube.com/@LinuxLorem

This way you get notified when the first videos are being released.

All Debian packages should include an AppArmor profile.
#apparmor #debian #ubuntu #linux #computersecurity #linuxsecurity

Russian hackers have upped the stealth game—embedding malware in ultra-light Linux VMs via Hyper-V to sidestep detection. Could your systems catch this modern tactic?

https://thedefendopsdiaries.com/russian-hackers-exploit-hyper-v-to-hide-malware-in-lightweight-linux-vms/

#hyperv
#linuxsecurity
#malwareevasion
#virtualization
#cyberattack
#curlycomrades
#edrbypass
#infosec
#threatdetection

CISA: High-severity Linux flaw now exploited by ransomware gangs https://www.bleepingcomputer.com/news/security/cisa-linux-privilege-escalation-flaw-now-exploited-in-ransomware-attacks/
#linuxsecurity #linux #ransomware