NetSec.news

All IT Security news !
#Cybersecurity #CyberThreats #Cyberdefense
👉

[NetSec.news @Net_Sec_News]

🚨 Silent Ransom Group escalates social engineering attacks ⚠️ FBI warns #SRG now targets law firms using IT impersonation 💻 Fake IT support calls and phishing used to steal sensitive data #CyberSecurity #SocialEngineering #CyberAttack 👉 https://t.co/GmMzYkX9bC

[NetSec.news @Net_Sec_News]

🚨 #Oglethorpe hit by #cyberattack affecting 92k+ individuals ⚠️ Exposed data reportedly includes SSNs, DOBs, driver’s licenses & medical records 📂 Behavioral health information among compromised data #DataBreach #Healthcare #CyberSecurity 👉 https://t.co/CUDJzRL8QD

[NetSec.news @Net_Sec_News]

🔍 Lawsuit targets use of Meta #Pixel, Google #Analytics & similar tracking tools on patient-facing systems ⚠️ Southern Illinois Healthcare sued over alleged use of tracking pixels on healthcare websites #HIPAA #Privacy #Healthcare 👉 https://t.co/Y631ZcPUgC

[NetSec.news @Net_Sec_News]

🚨 Former hospital pharmacist indicted for 8-year cyber spying campaign 👨‍⚕️ Nearly 200 victims including healthcare employees and associates 🏥University of #Maryland Medical Center faces civil claims #Privacy #Surveillance #DataTheft #Healthcare #HIPAA 👉 https://t.co/cjsC3vX0BF

[NetSec.news @Net_Sec_News]

🚨 #DoveHealthcare settles litigation tied to July 2024 #cyberattack 💻 Patient & employee data exposed, including SSNs and health information🏥Multiple lawsuits consolidated into one class action #DataBreach #HIPAA #Privacy #Healthcare 👉 https://t.co/zTqqoV9DvR

[NetSec.news @Net_Sec_News]

⚠️Even small compliance failures can trigger #OCR investigations 🔍Complaints and breach reports often lead to penalties 📂Common #HIPAA violations: failure to provide patient records on time ⏳Lack of safeguards and risk analysis also cited #Compliance 👉 https://t.co/xQbpJA3Okn

[NetSec.news @Net_Sec_News]

🚨 Brockton Hospital hit by #ransomware attack ⚠️ April 6 incident forced switch to paper records 💻IT systems down, ambulances diverted, treatments canceled🔒Anubis ransomware group claims attack #Healthcare #CyberAttack #DataBreach #SignatureHealthcare👉 https://t.co/0d5IobSLDr

[NetSec.news @Net_Sec_News]

📢 OCR highlights risk management as core HIPAA Security Rule requirement 🔐 Organizations must reduce risks to ePHI, not just assess them 📊 #HIPAA #Compliance #CyberSecurity Read more 👉 https://t.co/DTTC2Yc9ub

[NetSec.news @Net_Sec_News]

🏥 Concord Orthopaedics settles breach affecting 72,815 patients 💳 SSNs, driver's licenses, insurance information exposed ⚠️ Settlement provides medical data monitoring for all eligible individuals #DataBreach #Healthcare #PatientRights 👉 https://t.co/QYHT4qZXni

[NetSec.news @Net_Sec_News]

🏥 #TriMed medical implant manufacturer reports 9-day network breach 🦴 Orthopedic implant documentation exposed including surgical components📊 Total affected individuals undisclosed pending #OCR reporting #DataBreach #Healthcare #HIPAA 👉 https://t.co/NAYP74Q3zE

[NetSec.news @Net_Sec_News]

🏥 NYC Health + Hospitals discloses 79-day unauthorized network access 📅 November 25, 2025 - February 11, 2026 compromise period 🩺 Medical images, diagnoses, treatment plans exfiltrated #Healthcare #PatientPrivacy #Compliance #CyberSecurity 👉 https://t.co/XUhpdfQoYD

[NetSec.news @Net_Sec_News]

🚨 #TrinityHealth and #UPMC disclose #HIE unauthorized access incident🏥 Health Gorilla interoperability platform involved⚠️92-hospital health system across 22 states affected by access breach #Healthcare #DataSecurity #PatientPrivacy #HIPAA #Compliance 👉 https://t.co/iNaeOqsXXe

[NetSec.news @Net_Sec_News]

🚨 #Stryker medical device manufacturer hit by Iran-linked cyberattack 💻March 11 incident disrupts global operations across 61 countries 📊200K+ systems wiped, 50 TB data extracted 🏥Patient-related medical devices unaffected #Iran #Cyberattack👉 https://t.co/w8DWrVLgPo

[NetSec.news @Net_Sec_News]

🏥 PIH Health notifies patients after 40-day network compromise 📅 November-December 2024 unauthorized access across multiple facilities 💳 SSNs, financial data, medical records potentially exposed #DataBreach #Ransomware #Healthcare #CyberSecurity 👉https://t.co/d2IJnJrd4K

[Dhanian 🗯️ @e_opore]

Linux Security Fundamentals

1. Introduction

→ Linux security focuses on protecting the system, data, and services from unauthorized access, attacks, and misuse.
→ Linux is known for its strong security architecture, but proper configuration and management are essential.
→ Security involves controlling access, monitoring activities, and protecting system resources.

2. Core Security Principles

→ Confidentiality → Protect sensitive information from unauthorized access.
→ Integrity → Ensure data remains accurate and unchanged.
→ Availability → Ensure systems and services remain accessible when needed.

3. User and Permission Management

→ User Accounts

→ Each user has a unique User ID (UID).
→ Users belong to groups identified by Group IDs (GIDs).
→ Proper user management prevents unauthorized system access.

→ File Permissions

→ Linux uses three permission types:

→ Read (r) → Allows viewing file contents.
→ Write (w) → Allows modifying files.
→ Execute (x) → Allows running files as programs.

→ Permissions apply to:

→ Owner
→ Group
→ Others

→ Commands used:

→ chmod → change file permissions
→ chown → change file ownership
→ chgrp → change group ownership

4. Authentication Mechanisms

→ Linux authenticates users through several methods.

→ Password Authentication

→ Stored securely in /etc/shadow.
→ Passwords are hashed for security.

→ SSH Key Authentication

→ Uses public-private key pairs.
→ More secure than password authentication.

→ Multi-Factor Authentication (MFA)

→ Combines password with additional verification methods.

5. Access Control Systems

→ Discretionary Access Control (DAC)

→ Default Linux permission system.
→ File owners decide who can access their files.

→ Mandatory Access Control (MAC)

→ Enforces stricter security policies.
→ Examples:

→ SELinux
→ AppArmor

6. System Hardening

→ System hardening reduces attack surfaces.

→ Disable unnecessary services.
→ Update packages regularly.
→ Use strong password policies.
→ Restrict root login access.
→ Use SSH instead of insecure protocols.

7. Firewall Protection

→ Firewalls control network traffic entering or leaving the system.

→ Common Linux firewall tools:

→ iptables
→ nftables
→ UFW (Uncomplicated Firewall)

→ Firewalls protect against unauthorized network access.

8. Intrusion Detection

→ Detect suspicious activities in the system.

→ Tools include:

→ Fail2Ban → blocks repeated login attempts.
→ OSSEC → host-based intrusion detection.
→ AIDE → file integrity monitoring.

9. Software Updates and Patch Management

→ Regular updates fix vulnerabilities and bugs.

→ Commands used:

→ apt update && apt upgrade
→ yum update
→ dnf update

→ Keeping the system updated reduces security risks.

10. Logging and Monitoring

→ Monitor system logs to detect unusual activity.

→ Important log files:

→ /var/log/auth.log → authentication attempts
→ /var/log/syslog → system events
→ /var/log/kern.log → kernel messages

→ Tools like journalctl help analyze logs.

11. Security Best Practices

→ Use least privilege principle.
→ Enable firewall protection.
→ Monitor system logs regularly.
→ Use strong passwords and SSH keys.
→ Disable unused ports and services.
→ Backup important data.

12. Tip

→ Linux security relies on permissions, authentication, and monitoring.
→ Proper configuration significantly reduces vulnerabilities.
→ Combining system hardening, firewalls, and intrusion detection creates a strong defense.
→ Continuous monitoring and updates maintain system security.

📘 Linux Mastery Ebook

→ Master Linux internals, security, system monitoring, logging, process management, and architecture step-by-step.

🔗 Grab the Linux Mastery Ebook
https://t.co/mCaIRlvD0A

[NetSec.news @Net_Sec_News]

⚠️ Shadow AI-linked breaches cost $670K more than average incidents 📊 Two-thirds of affected organizations lack AI governance policies 📋 PII and intellectual property disproportionately exposed #DataBreach #AI #CyberSecurity 👉 https://t.co/DZ6wHkuwEp

[NetSec.news @Net_Sec_News]

🏥Granite Wellness Centers settles #ransomware case for $725K 💊 15,600 addiction treatment patients affected in Northern California 📋SSNs, bank accounts, treatment records compromised 📅Claims submission deadline: April 27, 2026 #DataBreach #Compliance👉https://t.co/e2fjIb5P5e

[Cyber Security News @The_Cyber_News]

Top Cyber Attacks - 2026 via @The_Cyber_News

[NetSec.news @Net_Sec_News]

🚨 #ApolloMD confirms 626,500 patients affected by May 2025 #Qilin attack ⚠️ Ransomware group claims 238 GB data theft 💳 SSNs, diagnoses, treatment data compromised 🏥 11 physician groups and emergency services affected #Ransomware #Healthcare #HIPAA 👉 https://t.co/WgxdDoWMIB

[NetSec.news @Net_Sec_News]

🔍 #HHS OIG recommends comprehensive web application inventory 💻 SSO solutions with centralized MFA enforcement prioritized 🛡️ Conditional access policies for external/unmanaged devices 📱 Regular #authentication control testing through simulations 👉 https://t.co/XkykgMj56b