Lambda with vulnerable policy

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Metadata

Id: terraform-aws-lambda-with-vulnerable-policy

Provider: AWS

Platform: Terraform

Severity: High

Category: Access Control

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Description

AWS Lambda permissions with wildcard actions (lambda:*) grant excessive privileges that violate the principle of least privilege, potentially allowing unauthorized operations on your Lambda functions. When wildcards are used, principals may execute unintended actions against your functions, leading to potential service disruption or data leakage. Instead of using wildcards like action = "lambda:*", specify only the precise permissions needed, such as action = "lambda:InvokeFunction" to ensure proper access controls and reduce the attack surface of your Lambda resources.

Compliant Code Examples

resource "aws_lambda_permission" "allow_cloudwatch" {
  statement_id  = "AllowExecutionFromCloudWatch"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.test_lambda.function_name
  principal     = "events.amazonaws.com"
  source_arn    = "arn:aws:events:eu-west-1:111122223333:rule/RunDaily"
  qualifier     = aws_lambda_alias.test_alias.name
}

resource "aws_lambda_alias" "test_alias" {
  name             = "testalias"
  description      = "a sample description"
  function_name    = aws_lambda_function.test_lambda.function_name
  function_version = "$LATEST"
}

resource "aws_lambda_function" "test_lambda" {
  filename      = "lambdatest.zip"
  function_name = "lambda_function_name"
  role          = aws_iam_role.iam_for_lambda.arn
  handler       = "exports.handler"
  runtime       = "nodejs12.x"
}

resource "aws_iam_role" "iam_for_lambda" {
  name = "iam_for_lambda"

  # Terraform's "jsonencode" function converts a
  # Terraform expression result to valid JSON syntax.
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Sid    = ""
        Principal = {
          Service = "lambda.amazonaws.com"
        }
      },
    ]
  })
}

Non-Compliant Code Examples

provider "aws" {
  region = "us-east-1"
}

resource "aws_lambda_function" "my-lambda" {
  filename = "~/Downloads/lambda.json.zip"
  function_name = "my-lambda"
  role          = aws_iam_role.lambda-role.arn
  handler       = "lambda_function.lambda_handler"
  runtime = "python3.8"
}

resource "aws_iam_role" "lambda-role" {
  name = "lambda-role"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

resource "aws_lambda_permission" "all" {
  statement_id  = "AllowAllResources"
  action        = "lambda:*"
  function_name = aws_lambda_function.my-lambda.function_name
  principal     = "s3.amazonaws.com"
  source_arn    = "arn:aws:s3:::delete-me-us-east-1-permissions-tests"
  source_account = "111111111111"
  qualifier     = aws_lambda_alias.my-lambda-alias.name
}


resource "aws_lambda_alias" "my-lambda-alias" {
  name             = "v1"
  description      = "a sample description"
  function_name    = aws_lambda_function.my-lambda.function_name
  function_version = "$LATEST"
}