Lambda Function Without Dead Letter Queue

• Query id: c2eae442-d3ba-4cb1-84ca-1db4f80eae3d
• Query name: Lambda Function Without Dead Letter Queue
• Platform: CloudFormation
• Severity: Low
• Category: Insecure Configurations
• URL: Github

Description

AWS Lambda Function should be configured for a Dead Letter Queue(DLQ)
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

AWSTemplateFormatVersion: '2010-09-09'
Description: VPC function.
Resources:
  Function:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.handler
      Role: arn:aws:iam::123456789012:role/lambda-role
      Code:
        S3Bucket: my-bucket
        S3Key: function.zip
      Runtime: nodejs12.x
      Timeout: 5
      TracingConfig:
        Mode: Active
      VpcConfig:
        SecurityGroupIds:
          - sg-085912345678492fb
        SubnetIds:
          - subnet-071f712345678e7c8
          - subnet-07fd123456788a036
      Tags:
        - Key: Description
          Value: VPC Function
        - Key: Type
          Value: AWS Lambda Function

Positive test num. 2 - yaml file

AWSTemplateFormatVersion: '2010-09-09'
Description: VPC function.
Resources:
  Function2:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.handler
      Role: arn:aws:iam::123456789012:role/lambda-role
      Code:
        S3Bucket: my-bucket
        S3Key: function.zip
      Runtime: nodejs12.x
      Timeout: 5
      TracingConfig:
        Mode: Active
      VpcConfig:
        SecurityGroupIds:
          - sg-085912345678492fb
        SubnetIds:
          - subnet-071f712345678e7c8
          - subnet-07fd123456788a036
      Tags:
        - Key: Description
          Value: VPC Function
        - Key: Type
          Value: AWS Lambda Function
      DeadLetterConfig:

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

AWSTemplateFormatVersion: '2010-09-09'
Description: VPC function.
Resources:
  Function3:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.handler
      Role: arn:aws:iam::123456789012:role/lambda-role
      Code:
        S3Bucket: my-bucket
        S3Key: function.zip
      Runtime: nodejs12.x
      Timeout: 5
      TracingConfig:
        Mode: Active
      VpcConfig:
        SecurityGroupIds:
          - sg-085912345678492fb
        SubnetIds:
          - subnet-071f712345678e7c8
          - subnet-07fd123456788a036
      Tags:
        - Key: Description
          Value: VPC Function
        - Key: Type
          Value: AWS Lambda Function
      DeadLetterConfig:
        TargetArn: arn:aws:sqs:us-east-1:2324243535:aaa