Securing AWS Lambda Functions

Understanding AWS Lambda Security: 

Even with serverless systems, like AWS Lambda deployments, application security is a top need. As serverless computing becomes more and more popular, it is critical to debunk several myths regarding Lambda’s security. A common misconception is that AWS is solely responsible for security, yet this is not quite true. AWS manages the operating system, basic services, and infrastructure under a shared responsibility paradigm. In the meanwhile, it is the responsibility of the customers to secure the code, data, and IAM policies that Lambda uses to grant access to the Lambda service. Security is, at its core, a team effort. 


Creating applications with serverless architecture ensures that one does not have to worry about the tricky job of regularly updating and securing the operating system and application servers. Instead, teams can focus efforts on safeguarding the application’s data. 

AWS Lambda security best practices: 

Let’s talk about some important things to keep in mind when using AWS Lambda functions. These practices are safety rules for Lambda functions. 

Identity and Access Management (IAM): A Lambda function is assigned a role during setup, which controls its access and user base. It is similar to giving someone your house keys. Ensure that this role gets access to only what it actually requires. It functions similarly to denying someone access to areas they shouldn’t be in by providing them with the appropriate number of keys. 

Single Responsibility Principle: Just as every individual should have a single primary job, every Lambda function should also have a single job. This reduces the likelihood of errors and makes things easier. Everything else won’t be impacted if something goes wrong. 

HTTP Access: Using AWS API Gateway is a wise choice if you want your Lambda to handle web requests. It functions similarly to additional security to thwart malicious activity on the internet. 

Cleaning Up: Lambda functions typically keep things neat, temporarily storing data akin to a temporary folder. Nevertheless, they can sometimes forget to tidy up. Therefore, it’s wise to perform a cleanup once they’ve served their purpose. 

Scrutinize Input: Always validate and cleanse input data to prevent malicious payloads from causing harm. Lambda functions should only process data that adheres to expected standards, with detailed logging for any input that doesn’t. 

Deploy in a VPC with Limited Access: Just like with other cloud resources, deploying Lambda functions within a Virtual Private Cloud (VPC) with minimal permissions is a recommended best practice. This restricts potential attacks from accessing additional resources within your AWS account. 

Effective Monitoring: To closely monitor the security and performance of Lambda functions, set up alerts and monitoring. AWS CloudWatch dashboards and other third-party solutions can offer insightful information and alert operations staff to any irregularities. 

Compliance: If the applications handle sensitive data, compliance with relevant regulations is essential. AWS offers compliance programs for various frameworks to help ensure the applications meet legal requirements.  


One must understand and put into practice AWS Lambda security best practices if they want to safeguard their serverless applications in the constantly changing digital marketplace. It is undeniable that both AWS and the company must work together to ensure the security of the Lambda functions, regardless of the misconceptions around the shared responsibility paradigm. One can confidently embrace the potential of serverless architecture and ensure that the applications are secure and efficient by adhering to these safety standards and guidelines.