Serverless function without dead-letter queue

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Metadata

Id: cloudformation-aws-serverless-function-without-dead-letter-queue

Provider: AWS

Platform: CloudFormation

Severity: Low

Category: Insecure Configurations

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Description

Serverless functions without a dead-letter queue (DLQ) can lose events from failed asynchronous invocations and make failure diagnosis and recovery difficult. For AWS::Serverless::Function resources, the DeadLetterConfig property must be defined and not null. The DeadLetterConfig should include a valid TargetArn that points to a durable target such as an Amazon SQS queue or an Amazon SNS topic; resources missing DeadLetterConfig or with it set to null will be flagged.

Secure configuration example:

MyDeadLetterQueue:
  Type: AWS::SQS::Queue

MyFunction:
  Type: AWS::Serverless::Function
  Properties:
    Handler: index.handler
    Runtime: nodejs14.x
    DeadLetterConfig:
      TargetArn: !GetAtt MyDeadLetterQueue.Arn

Compliant Code Examples

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: AWS SAM template with a simple API definition
Resources:
  Function1:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      ImageUri: account-id.dkr.ecr.region.amazonaws.com/ecr-repo-name:image-name
      ImageConfig:
        Command:
          - "app.lambda_handler"
        EntryPoint:
          - "entrypoint1"
        WorkingDirectory: "workDir"
      Tags:
        - Key: Type
          Value: AWS Serverless Function
      DeadLetterConfig:
        TargetArn: arn:aws:sqs:us-east-1:2324243535:aaa
        Type: SQS

Non-Compliant Code Examples

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: AWS SAM template with a simple API definition
Resources:
  Function:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      ImageUri: account-id.dkr.ecr.region.amazonaws.com/ecr-repo-name:image-name
      ImageConfig:
        Command:
          - "app.lambda_handler"
        EntryPoint:
          - "entrypoint1"
        WorkingDirectory: "workDir"
      Tags:
        - Key: Type
          Value: AWS Serverless Function