Amazon Web Services powers applications, APIs, databases, storage platforms, and enterprise infrastructure across almost every industry. As organizations move more workloads into the cloud, securing those environments has become a core cybersecurity requirement.
An effective AWS Security Checklist helps security teams systematically review the controls that protect identities, workloads, networks, applications, and data. It also helps penetration testers and cloud engineers identify common misconfigurations before attackers can turn them into a practical attack path.
AWS security is not a single configuration or service. It is a combination of identity management, network protection, data security, logging, monitoring, vulnerability management, incident response, and secure application development. AWS organizes its security guidance around areas including security foundations, identity and access management, detection, infrastructure protection, data protection, incident response, and application security.
This checklist can be used during AWS security assessments, cloud audits, penetration testing engagements, architecture reviews, and regular security hardening.
What Is an AWS Security Checklist?
An AWS Security Checklist is a structured list of security controls used to review an AWS environment for weaknesses, misconfigurations, excessive permissions, exposed resources, and missing security controls.
It can cover services such as:
- AWS IAM
- IAM Identity Center
- Amazon EC2
- Amazon S3
- Amazon VPC
- Amazon RDS
- AWS Lambda
- Amazon EKS
- AWS CloudTrail
- Amazon GuardDuty
- AWS Security Hub
- AWS Config
- AWS KMS
- Amazon CloudWatch
- AWS Organizations
- AWS WAF
- AWS Secrets Manager
The checklist should not be treated as a one-time exercise. Cloud environments change continuously as teams deploy new workloads, create identities, modify permissions, and introduce new services.
AWS recommends automating security controls and continuously improving security processes rather than relying only on manual reviews.
Why Is an AWS Security Checklist Important?
A cloud environment can contain thousands of resources and permissions.
Without a structured review process, security teams can easily overlook something important.
For example, an organization may have strong MFA and encryption but still expose an S3 bucket publicly. Another organization may have correctly configured network controls but give an application role excessive IAM permissions.
These weaknesses can create significant attack paths.
Common AWS Security Risks
Some frequently encountered issues include:
- Weak IAM permissions
- Missing MFA
- Unprotected root accounts
- Public S3 resources
- Exposed management ports
- Unrestricted security groups
- Long-lived access keys
- Hardcoded credentials
- Missing CloudTrail logging
- Poorly configured encryption
- Weak network segmentation
- Unpatched EC2 systems
- Missing backups
- Insufficient monitoring
- Overly permissive cross-account access
The purpose of a checklist is to make these areas easier to identify and remediate.
AWS Security Checklist: Identity and Access Management
Identity should be one of the first areas reviewed.
AWS recommends using temporary credentials, enforcing MFA, applying least privilege, reviewing unused permissions, and using IAM Access Analyzer to understand and reduce unnecessary access.
1. Secure the AWS Root User
The AWS root user has extremely powerful privileges.
AWS recommends avoiding routine use of the root user and protecting its credentials carefully. Root access should be reserved for tasks that specifically require it.
Checklist:
- Root user has MFA enabled
- Root access keys do not exist
- Root credentials are not shared
- Root account activity is monitored
- Root credentials are stored securely
- Root access is restricted to exceptional tasks
For AWS Organizations, AWS also recommends centralizing root access management and removing root credentials from member accounts where appropriate.
2. Enforce Multi-Factor Authentication
MFA adds another authentication factor beyond a password.
Security teams should prioritize phishing-resistant MFA such as passkeys or security keys where supported. AWS specifically recommends phishing-resistant MFA wherever possible.
Checklist:
- MFA enabled for privileged users
- MFA enabled for appropriate IAM users
- Root user protected with MFA
- Strong authentication policies enforced
- Phishing-resistant MFA considered for privileged access
3. Apply Least Privilege
Users and workloads should receive only the permissions necessary to perform their tasks.
Avoid unnecessarily assigning broad policies such as full administrative access.
For example, an application that only needs to read objects from one S3 bucket should not automatically receive permissions across every S3 resource.
AWS recommends gradually moving from broad permissions toward least privilege and using IAM Access Analyzer to help generate policies based on actual access activity.
4. Review IAM Users and Roles
Regularly identify:
- Unused IAM users
- Inactive roles
- Old access keys
- Unused policies
- Excessive permissions
- Privileged accounts
- Cross-account roles
Remove access that is no longer required.
5. Avoid Long-Lived Credentials
Long-lived access keys increase the impact of credential theft.
Where possible, use temporary credentials and IAM roles instead.
AWS recommends IAM roles and temporary credentials for both human users and workloads.
6. Review Cross-Account Access
Organizations often use multiple AWS accounts.
Review:
- Cross-account IAM roles
- Trust policies
- External principals
- Resource policies
- Organization policies
- Service Control Policies
Make sure external accounts cannot access resources unnecessarily.
AWS S3 Security Checklist
Amazon S3 is one of the most commonly used AWS services and should receive particular attention during security reviews.
7. Block Unintended Public Access
Review whether buckets or objects are publicly accessible.
Checklist:
- S3 Block Public Access configured appropriately
- Bucket policies reviewed
- Object permissions reviewed
- Public access exceptions documented
- Sensitive buckets are private
A public bucket is not automatically a vulnerability if the data is intentionally public. The security question is whether the exposure matches the business requirement.
8. Enable Encryption
Sensitive data stored in S3 should use appropriate encryption controls.
Review:
- Server-side encryption
- AWS KMS keys
- Key policies
- Encryption requirements
- Data classification
9. Review Bucket Policies
Look for policies that allow:
- Unrestricted principals
- Broad actions
- Public reads
- Public writes
- Unexpected cross-account access
Use conditions to narrow access where possible.
10. Protect S3 Logging and Monitoring
Monitor important bucket activity and investigate unusual access patterns.
Sensitive storage should receive additional monitoring and alerting.
EC2 Security Checklist
Amazon EC2 instances can become an entry point into a broader AWS environment if they are poorly secured.
11. Patch EC2 Systems
Review:
- Operating system updates
- Application updates
- Vulnerable packages
- Kernel versions
- Installed services
Use automated patch management where practical.
12. Restrict Security Groups
Avoid unnecessary inbound exposure.
For example, SSH should not normally be open to the entire internet simply because administrators need remote access.
Review:
- Port 22
- Port 3389
- Application ports
- Database ports
- Management interfaces
Use trusted sources, private connectivity, bastion architectures, or other appropriate controls.
13. Remove Unnecessary Services
Every exposed service increases attack surface.
Disable services that are not required.
14. Protect EC2 Metadata Access
Applications running on EC2 can interact with instance metadata.
Where supported, enforce appropriate metadata service protections and avoid unnecessary exposure of instance credentials.
15. Use IAM Roles for EC2
Avoid embedding static AWS credentials inside applications.
Assign an appropriate IAM role to the instance instead.
AWS VPC and Network Security Checklist
Network architecture remains an important part of cloud security.
AWS recommends defense in depth and applying security controls across network, compute, operating system, application, and code layers.
16. Review VPC Architecture
Check:
- Public subnets
- Private subnets
- Route tables
- Internet gateways
- NAT gateways
- Network ACLs
- Security groups
- VPC endpoints
- Peering connections
17. Separate Sensitive Workloads
Applications, databases, management systems, and other sensitive workloads should be appropriately segmented.
AWS recommends separating workloads using accounts based on factors such as function, compliance requirements, and data sensitivity.
18. Restrict Database Access
Databases should not be unnecessarily exposed to the public internet.
Review:
- RDS security groups
- Database subnet placement
- Network ACLs
- Authentication
- Encryption
- Backup configuration
AWS Logging and Monitoring Checklist
You cannot respond effectively to an attack if you cannot see what happened.
19. Enable AWS CloudTrail
CloudTrail provides visibility into AWS API activity.
Review:
- CloudTrail enabled
- Logging covers required accounts and regions
- Logs protected against unauthorized modification
- Appropriate retention configured
- Logs sent to a protected destination
AWS recommends monitoring and auditing actions and changes in the environment to maintain traceability.
20. Configure GuardDuty
Amazon GuardDuty provides threat detection across AWS accounts, workloads, containers, and data sources.
AWS describes GuardDuty as a service that continuously analyzes relevant signals to identify and prioritize potential security threats.
Checklist:
- GuardDuty enabled
- Findings monitored
- Alerts integrated into security workflows
- Findings investigated
- Multi-account coverage considered
21. Use AWS Security Hub
Security Hub can provide centralized visibility into security findings and security controls.
Review whether it is configured across relevant AWS accounts and regions.
22. Configure CloudWatch Monitoring
Use CloudWatch where appropriate to monitor:
- Authentication events
- Application behavior
- Resource changes
- Performance anomalies
- Security-related events
AWS Data Protection Checklist
Data security should cover both stored data and data moving between services.
23. Encrypt Sensitive Data at Rest
Review encryption for:
- S3
- EBS
- RDS
- DynamoDB
- EFS
- Backups
24. Protect Data in Transit
Use TLS for communications involving sensitive information.
Avoid transmitting credentials, tokens, or sensitive business data over unencrypted channels.
25. Secure AWS KMS
AWS Key Management Service can be used to control encryption keys.
Review:
- Key policies
- Key administrators
- Key users
- Rotation requirements
- Cross-account access
- Key deletion policies
26. Classify Sensitive Data
Not every piece of data requires identical security controls.
Identify:
- Personal information
- Financial information
- Credentials
- API secrets
- Customer records
- Business-critical data
Apply stronger controls to higher-risk information.
AWS Secrets Management Checklist
Secrets frequently become security problems when developers treat them like normal configuration values.
27. Do Not Hardcode Secrets
Avoid placing AWS credentials or application secrets in:
- Source code
- Git repositories
- Dockerfiles
- Configuration files
- Public documentation
- Application logs
28. Use Secrets Manager or Parameter Store
Centralized secret management reduces unnecessary exposure.
Review:
- Secret permissions
- Rotation
- Access logging
- IAM policies
- Secret sharing
- Secret expiration
29. Scan Code and Repositories
Regularly scan repositories for:
- AWS access keys
- API keys
- Passwords
- Private keys
- Tokens
- Database credentials
AWS Application Security Checklist
Cloud infrastructure can be configured correctly while the application remains vulnerable.
30. Secure APIs
Test:
- Authentication
- Authorization
- Input validation
- Rate limiting
- API keys
- JWT handling
- CORS
- Error handling
- Business logic
For API security guidance, organizations can also review the OWASP API Security Top 10. (owasp.org)
31. Deploy AWS WAF Where Appropriate
AWS WAF can help protect supported applications from common web threats.
Review:
- Managed rules
- Custom rules
- Rate-based rules
- IP restrictions
- Logging
- Alerting
WAF should complement secure application development rather than replace it.
32. Secure Serverless Applications
For Lambda and other serverless workloads, review:
- Function permissions
- Environment variables
- Dependencies
- Event triggers
- API authorization
- Resource policies
- Logging
A Lambda function should receive only the permissions required for its specific task.
AWS Backup and Recovery Checklist
Security also includes resilience.
33. Enable Appropriate Backups
Review backups for:
- RDS
- EBS
- DynamoDB
- S3
- Critical application data
34. Test Restoration
A backup that has never been restored should not automatically be considered reliable.
Periodically test recovery procedures.
35. Protect Backups
Backups should have appropriate:
- Access controls
- Encryption
- Retention
- Monitoring
- Isolation
Consider protection against accidental deletion and ransomware-related scenarios.
AWS Configuration and Compliance Checklist
36. Use AWS Config
AWS Config can help track resource configurations and evaluate compliance with defined rules.
Review whether important resources are monitored.
37. Compare Against Security Benchmarks
The CIS AWS Foundations Benchmark provides secure configuration recommendations for AWS. CIS currently lists AWS Foundations Benchmark 7.0.0 alongside separate benchmarks for compute, database, storage, and other AWS areas.
A benchmark should be treated as a baseline, not as a replacement for threat modeling or penetration testing.
38. Review Security Findings Regularly
Security findings should have:
- An owner
- A severity
- A remediation deadline
- A documented exception where necessary
- Verification after remediation
AWS Incident Response Checklist
Preventive controls are only part of the security strategy.
39. Create an Incident Response Plan
Define what happens when:
- Credentials are compromised
- An EC2 instance is breached
- Sensitive data is exposed
- An IAM role is abused
- A suspicious API call is detected
40. Prepare Credential Revocation Procedures
Security teams should know how to:
- Disable compromised credentials
- Rotate secrets
- Revoke sessions where applicable
- Restrict compromised roles
- Isolate affected workloads
41. Preserve Evidence
Logging should support investigation after a security event.
Protect relevant logs from unauthorized deletion or modification.
42. Test the Response Process
Run tabletop exercises and controlled security simulations.
AWS includes incident response as one of the major areas of its Security Pillar and recommends preparing for security events with defined processes and simulations.
AWS Security Checklist for Penetration Testers
A penetration tester can use the checklist as a starting point for an authorized AWS assessment.
Focus on:
- IAM privilege escalation
- Excessive permissions
- Public S3 resources
- Exposed EC2 services
- Weak security groups
- Public databases
- Cross-account trust
- Exposed credentials
- Metadata-service risks
- Vulnerable applications
- API authorization
- Serverless permissions
- Container security
- Logging gaps
- Detection controls
The goal should not be to simply collect configuration issues.
A strong assessment demonstrates realistic attack paths.
For example:
Public Web Application
↓
Application Vulnerability
↓
Compromised Workload
↓
IAM Role
↓
Excessive Permissions
↓
Sensitive S3 DataThis type of attack path explains why an apparently moderate application vulnerability can become a high-impact cloud security issue.
AWS Security Tools
Several AWS-native and third-party tools can support security assessments.
AWS IAM Access Analyzer
Useful for identifying unintended access and helping develop least-privilege policies.
AWS CloudTrail
Provides audit visibility into AWS API activity.
Amazon GuardDuty
Provides managed threat detection capabilities.
AWS Security Hub
Provides centralized security posture and finding visibility.
AWS Config
Helps evaluate resource configurations against security and compliance rules.
Amazon Inspector
Can help identify vulnerabilities and exposure in supported workloads.
Prowler
Prowler is widely used for AWS security assessment and benchmark-oriented checks.
ScoutSuite
ScoutSuite can assist with cloud configuration assessment.
Tools improve coverage, but manual review remains important. Automated findings need context, validation, and prioritization.
AWS Security Best Practices
The most effective AWS security programs generally follow a few core principles.
Use Least Privilege
Give identities only the access they require.
Prefer Temporary Credentials
Avoid unnecessary long-term access keys.
Separate AWS Accounts
Use account separation where it improves isolation and governance.
Automate Security Controls
Security checks should run continuously where practical.
Encrypt Sensitive Data
Protect data both at rest and in transit.
Centralize Logging
Make important security events available for investigation.
Monitor Continuously
Use detection capabilities to identify suspicious activity.
Test Regularly
Configuration reviews, vulnerability assessments, penetration testing, and incident-response exercises should complement each other.
AWS’s Well-Architected Security Pillar explicitly recommends regular penetration testing as part of application and workload security.
AWS Security Checklist: Quick Reference
Use this condensed list during an initial review:
- Root account secured
- Root MFA enabled
- Root access keys removed
- IAM MFA enabled
- Least privilege enforced
- IAM users reviewed
- IAM roles reviewed
- Access keys reviewed
- Temporary credentials preferred
- Cross-account access reviewed
- S3 public access reviewed
- S3 encryption enabled where required
- S3 bucket policies reviewed
- EC2 systems patched
- Security groups reviewed
- Administrative ports restricted
- VPC segmentation reviewed
- Databases protected
- CloudTrail enabled
- GuardDuty enabled where appropriate
- Security Hub configured where appropriate
- CloudWatch monitoring configured
- Sensitive data encrypted
- KMS policies reviewed
- Secrets centrally managed
- Credentials removed from source code
- APIs tested
- WAF configured where appropriate
- Lambda permissions reviewed
- Backups configured
- Recovery tested
- AWS Config considered
- CIS benchmark reviewed
- Incident response plan documented
- Credential compromise procedures tested
- Logs protected
- Security findings tracked
- Penetration testing performed periodically
How to Learn AWS Security
AWS security combines cloud architecture, networking, identity management, application security, monitoring, and incident response.
A good learning path starts with AWS fundamentals and then moves into:
- IAM
- VPC networking
- EC2 security
- S3 security
- CloudTrail
- GuardDuty
- Security Hub
- KMS
- Lambda security
- API security
- Container security
- Cloud penetration testing
- Incident response
Practical experience is especially important for penetration testers.
You can strengthen your fundamentals through cyber security training and practice security concepts in hands-on labs.
For professional security resources, assessments, and learning content, visit PentestHint.
Career Opportunities in AWS Security
AWS security knowledge can support several cybersecurity career paths.
Common roles include:
- Cloud Security Engineer
- AWS Security Engineer
- Cloud Penetration Tester
- Security Consultant
- DevSecOps Engineer
- Application Security Engineer
- Cloud Security Architect
- SOC Analyst
- Red Team Operator
- Vulnerability Analyst
For penetration testers, AWS knowledge is particularly valuable because modern applications frequently depend on cloud identities, APIs, storage, containers, and serverless services.
A tester who understands both application vulnerabilities and AWS architecture can identify attack paths that a traditional network assessment may miss.
Future of AWS Security
AWS environments are becoming increasingly automated and distributed.
Organizations are adopting infrastructure as code, serverless applications, containers, Kubernetes, multi-account architectures, CI/CD pipelines, and identity-centric security models.
That means cloud security cannot remain a manual checklist performed once a year.
Security controls need to become part of the development and deployment lifecycle.
Automated configuration checks, continuous monitoring, identity analysis, threat detection, vulnerability management, and regular penetration testing can work together to reduce risk.
AWS’s current security guidance emphasizes automation, traceability, defense in depth, data protection, and preparation for security events.
The checklist itself should therefore be treated as a living document. Update it whenever AWS introduces significant services, architecture changes, new threats, or changes in business requirements.
Frequently Asked Questions
What is an AWS Security Checklist?
An AWS Security Checklist is a structured set of security checks used to review AWS identities, permissions, networking, storage, workloads, encryption, monitoring, logging, backups, and incident-response controls.
Why is AWS security important?
AWS environments can contain sensitive data, critical applications, credentials, APIs, and business infrastructure. Misconfigured permissions or exposed resources can create serious security risks.
What should I check first in AWS security?
Start with the root account, MFA, IAM permissions, access keys, public resources, security groups, CloudTrail logging, and sensitive data exposure. Identity and access management should be a major priority.
Should the AWS root account be used regularly?
No. AWS recommends avoiding routine use of the root user and using it only for tasks that specifically require root credentials. Root credentials should be strongly protected and monitored.
How often should AWS security be reviewed?
AWS security should be monitored continuously, while comprehensive security reviews and penetration tests should be performed periodically and after significant architectural or application changes.
Is AWS Security Hub enough to secure an AWS environment?
No. Security Hub can provide valuable security posture and finding visibility, but it should complement IAM controls, network security, encryption, logging, vulnerability management, secure development, monitoring, and incident response.
What is the CIS AWS Benchmark?
The CIS AWS Foundations Benchmark is a set of secure configuration recommendations for AWS. It can be used as a security baseline during cloud audits and configuration assessments.
Can penetration testing be performed on AWS?
Yes, authorized testing can be performed against customer-controlled AWS resources, subject to AWS policies and applicable rules. Testing should always have explicit authorization and a clearly defined scope.
Conclusion
AWS security requires more than enabling a few security services.
A secure environment starts with strong identity controls and least privilege, then builds additional layers through network segmentation, encryption, secure storage, workload hardening, logging, monitoring, vulnerability management, backups, and incident response.
The most important areas in this AWS Security Checklist are IAM, root-account protection, MFA, temporary credentials, S3 security, EC2 hardening, VPC configuration, CloudTrail, threat detection, encryption, secrets management, application security, and recovery planning.
Security should also be treated as an ongoing process. AWS environments change constantly, and new resources or permissions can introduce vulnerabilities without anyone intentionally weakening the environment.
Regular configuration reviews, automated security controls, penetration testing, and practical incident-response exercises can help organizations stay ahead of those changes.
For cybersecurity professionals, AWS security is also an important skill for modern penetration testing and cloud security roles. Building practical knowledge through cyber security training and cyber security labs can help turn theoretical cloud concepts into practical security skills.
For more cybersecurity resources and professional security guidance, explore PentestHint.
