Threat Modeling & AppSec in AWS Serverless

1. Introduction

Threat modeling is a structured approach to identifying and mitigating potential security threats in applications. In the context of AWS Serverless, it involves understanding how serverless architectures operate and the unique security considerations that come with them.

2. Key Concepts

2.1 Definitions

Threat Modeling: A process for identifying and assessing potential threats to a system.
Application Security (AppSec): The measures and practices designed to protect applications from security threats.
AWS Serverless: A cloud computing execution model where the cloud provider dynamically manages the allocation of machine resources.

3. Step-by-Step Process

3.1 Steps in Threat Modeling

Identify Assets: Determine what assets need protection, such as user data, APIs, and sensitive configurations.
Identify Threats: Use frameworks like STRIDE (Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, Elevation of Privilege) to identify potential threats.
Assess Vulnerabilities: Analyze the assets and identify existing vulnerabilities that could be exploited by threats.
Determine Mitigation Strategies: Develop strategies to mitigate identified threats, which may include implementing AWS security features like IAM, VPCs, and API Gateway security.
Document Findings: Document the threat model and make it accessible for ongoing review and updates.

4. Best Practices

4.1 Security Best Practices for AWS Serverless

Enable least privilege access for IAM roles and policies.
Use AWS Lambda environment variables to manage sensitive data securely.
Implement API Gateway to enforce throttling and authorization.
Regularly update and audit permissions and services within your AWS account.
Utilize AWS CloudTrail for logging and monitoring API calls to your services.

5. FAQ

What is the purpose of threat modeling?

The purpose of threat modeling is to identify potential security threats and vulnerabilities in a system and to develop strategies to mitigate those risks.

How does AWS Serverless differ in terms of security?

AWS Serverless architectures require different security considerations than traditional architectures, such as reliance on managed services, shared responsibility models, and the need for careful configuration of IAM roles.

What is STRIDE?

STRIDE is a threat modeling framework that categorizes threats into six types: Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, and Elevation of Privilege.

6. Flowchart for Threat Modeling Process


            graph TD;
                A[Start] --> B[Identify Assets]
                B --> C[Identify Threats]
                C --> D[Assess Vulnerabilities]
                D --> E[Determine Mitigation Strategies]
                E --> F[Document Findings]
                F --> G[Review and Update]
                G --> A