AWS Cloud Security: The Complete Guide (IAM, VPC, KMS, GuardDuty)

❌ Avoid:

"Action": ""

Key Rules:

• Enable MFA on root
• Delete root access keys
• Use roles (not users)
• Enable IAM Access Analyzer

---

🌐 Pillar 2 — VPC (Network Security)

Golden rule: Never expose everything to the internet.

❌ Dangerous config:

• Port 22 → 0.0.0.0/0

✅ Secure architecture:

• Public subnet → Load balancer only
• Private subnet → App servers
• Isolated subnet → Database

Enable flow logs:

aws ec2 create-flow-logs ...

---

🪣 Pillar 3 — S3 Security

Block public access globally:

aws s3control put-public-access-block ...

• Enforce HTTPS
• Enable encryption (KMS)

👉 Most common breach: public S3 bucket.

---

🔑 Pillar 4 — KMS (Encryption)

• Use customer-managed keys (CMK)
• Enable rotation

aws kms enable-key-rotation --key-id your-key

👉 Required for compliance + audit logs.

---

🛡️ Pillar 5 — GuardDuty (Threat Detection)

aws guardduty create-detector --enable

Detects:

• Stolen credentials
• Crypto mining
• Suspicious API activity

👉 Low cost (~$4/month) — high value.

---

📜 Pillar 6 — CloudTrail (Audit Logs)

aws cloudtrail create-trail --is-multi-region-trail

• Logs every API call
• Critical for audits & debugging

👉 Must enable in all regions.

---

✅ AWS Security Checklist

Do Today

• MFA on root
• Enable CloudTrail
• Enable GuardDuty
• Block S3 public access

This Week

• Enable encryption (EBS + S3)
• Audit IAM permissions
• Fix open security groups

This Month

• Implement least privilege IAM
• Replace SSH with SSM
• Enable AWS Config

---

🔗 Learn by Doing (Hands-On Labs)

• AWS Cloud Foundations Track
• Platform Forge (Security + Infra)

---

🔗 Related Articles

• AWS Shared Responsibility Model
• What is VPC in AWS
• AWS EBS Explained

---

❓ FAQs

What is AWS cloud security?

AWS cloud security includes IAM, network protection, encryption, monitoring, and auditing.

What is the biggest AWS security risk?

Misconfigured IAM permissions and public S3 buckets.

Is AWS secure by default?

Yes, but misconfigurations can make your environment vulnerable.

How much does AWS security cost?

Basic security setup can cost under $20/month for small environments.

---