Stop Using AdministratorAccess! Secure AWS IAM Permissions Properly

AWS IAM Least Privilege Access Tutorial | Restrict S3 Bucket Access Securely One of the biggest AWS security mistakes is giving users AdministratorAccess when they only need limited permissions. In this video, you’ll learn how real companies implement Least Privilege Access in AWS using: IAM Users IAM Groups Inline Policies S3 Bucket Permissions Resource ARNs You’ll build a real-world AWS IAM lab where a contractor can upload and read files from only one S3 bucket — while being completely blocked from EC2 and other AWS services. This is a practical AWS security tutorial for: AWS beginners Cloud engineers DevOps engineers Sysadmins Security engineers If you're learning AWS, IAM is one of the MOST important services to master. ⏱️ Timeline 00:00 Why AdministratorAccess is dangerous 00:37 What is Least Privilege Access in AWS 00:55 Open S3 bucket & copy ARN 02:19 Why companies use IAM Groups 02:58 Create IAM User Group 03:28 Create Inline Policy for S3 04:24 Understanding Least Privilege Policy 05:40 Restrict access to one S3 bucket only 06:30 Why /* matters in S3 object permissions 07:18 Create IAM user 08:02 Enable AWS Console login 08:47 Add user to IAM Group 09:36 Login as contractor user 11:39 Test S3 upload & read access 13:07 Verify blocked access to EC2 13:51 IAM security best practices 14:58 Outro 💻 IAM Policy JSON (Copy & Paste) { "Version": "2012-10-17", "Statement": [ { "Sid": "AllowConsoleAccess", "Effect": "Allow", "Action": "s3:ListAllMyBuckets", "Resource": "*" }, { "Sid": "AllowBucketAndObjectActions", "Effect": "Allow", "Action": [ "s3:Get*", "s3:List*", "s3:Describe*", "s3:Put*" ], "Resource": [ "arn:aws:s3:::YOUR_BUCKET_NAME", "arn:aws:s3:::YOUR_BUCKET_NAME/*" ] } ] } Replace: your_bucket_name with your real S3 bucket name. 🎯 What You’ll Learn AWS IAM fundamentals How Least Privilege works Difference between IAM Users and Groups How IAM Policies use ARNs How to restrict users to ONE S3 bucket Why arn:aws:s3:::bucket/* is critical AWS security best practices used in production 🔗 Related Article & Resources How to create a wordpess website on AWS EC2 instance with just one: clickhttps://youtu.be/CZhI57sTM_Y My website: https://luuhophuong.com #AWS#IAM#AWSSecurity#AmazonS3#CloudSecurity#DevOps#AWSIAM #SysAdmin#CloudComputing#LeastPrivilege#AWSBeginner#S3Bucket #Terraform#Linux#CloudEngineer In real-world AWS environments, security is NOT about giving full access. It’s about giving users exactly the permissions they need — and nothing more.