I only exposed an S3 bucket to test... what could go wrong
AWS security is not just for cloud architects at large enterprises; it is critical for everyone, especially for those just starting out, because one misstep can leave your application, data, or even your entire AWS account exposed to the world
In this article, you will see the 10 most common security mistakes new AWS users make, how to fix them, and what to do instead, explained in simple terms for beginners
1 - Using the root account for everything
Mistake: Using the AWS root user, the account created when you sign up, to launch EC2, manage IAM, or deploy services
Solution: Create an IAM administrator user with the necessary permissions. Enable MFA on the root account. Use the root account only for billing and account-level configuration
2 - Leaving S3 buckets public by default
Mistake: Creating a bucket to upload images and forgetting to block it, resulting in public exposure
Solution: Establish policies that deny public access by default. Enable S3 Block Public Access. Use pre-signed URLs if you need controlled public access
3 - Ignoring IAM best practices
Mistake: Giving AdministratorAccess to everyone because it is easier than fine-tuning permissions
Solution: Apply the principle of least privilege. Assign only the necessary policies to users, roles, or groups. Use IAM roles for services like EC2 or Lambda
4 - Not enabling MFA (multi-factor authentication)
Mistake: Logging in with just an email and password without an additional security layer
Solution: Enable MFA for all IAM users and the root account. Use virtual MFA apps like Google Authenticator or Authy
5 - Putting AWS keys in the source code
Mistake: Including access keys and secrets in the code or uploading them to public repositories
Solution: Use IAM roles when running on AWS (EC2, Lambda). Use AWS CLI profiles for local development. Store secrets in AWS Secrets Manager or SSM Parameter Store
6 - Skipping logging and monitoring
Mistake: Not enabling CloudTrail or CloudWatch Logs, so no one knows who did what
Solution: Enable CloudTrail globally. Enable logs for S3, Lambda, API Gateway. Use Amazon GuardDuty for threat detection
7 - Opening all ports in Security Groups
Mistake: Allowing inbound traffic from 0.0.0.0/0 to all ports in EC2 or RDS Security Groups
Solution: Open only the necessary ports, for example, 22 for SSH, 80 for HTTP. Restrict IP addresses to trusted sources. Use bastion hosts or VPN for internal access
8 - Not using encryption
Mistake: Storing sensitive data in plain text in RDS, S3, or EBS
Solution: Enable SSE (Server Side Encryption) in S3. Use encryption at rest for RDS, EBS, and EFS. Encrypt in transit with HTTPS and SSL/TLS
9 - Forgetting budgets and spending alerts
Mistake: A forgotten EC2 or RDS instance burns through the Free Tier and your credit card
Solution: Set up AWS Budgets and cost alerts. Enable billing alarms in CloudWatch
10 - Not deleting unused resources or credentials
Mistake: Leaving old IAM users, access keys, test instances, or Lambda triggers without control
Solution: Regularly audit and clean up unused users, keys, and roles. Tag and track resources to facilitate cleanup. Use AWS Trusted Advisor for security recommendations
Quick summary - Solutions cheatsheet
Root account for everything: Create an IAM administrator user and enable MFA
Public S3: Block public access and use pre-signed URLs
Admin permissions for everyone: Apply least privilege
No MFA: Enable MFA for root and IAM users
Keys in code: Use roles and Secrets Manager
No logs: Enable CloudTrail and GuardDuty
Open ports: Restrict Security Groups
No encryption: Use SSE and HTTPS everywhere
Surprise billing: Set up budgets and alarms
Forgotten resources: Clean up and tag regularly
About Q2BSTUDIO
At Q2BSTUDIO, we are a custom software and application development company specializing in artificial intelligence, cybersecurity, and AWS and Azure cloud services. We offer custom software services, custom applications, AI for businesses, AI agents, business intelligence services, and Power BI implementation. Our team helps implement security and best practices from day one, integrating access controls, secret management, encryption, monitoring, and automation to reduce risks and optimize costs
If you are looking for advice to harden your AWS environment or migrate securely to the cloud, contact Q2BSTUDIO. Our approach combines expertise in cybersecurity, artificial intelligence, and cloud solutions to deliver tailored products and services that protect your data and accelerate business intelligence
Share your mistakes or security tips, and if this article was useful to you, follow Q2BSTUDIO for more guides on custom applications, custom software, artificial intelligence, cybersecurity, AWS and Azure cloud services, business intelligence services, AI for businesses, AI agents, and Power BI
