Amplify app basic auth config password exposed

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Metadata

Id: cloudformation-aws-amplify-app-basic-auth-config-password-exposed

Provider: AWS

Platform: CloudFormation

Severity: High

Category: Secret Management

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Provider Reference

Description

Amplify apps with BasicAuth enabled must not embed the password as a plaintext string or as a parameter Default because embedded secrets in templates or defaults can be exposed via source control, CloudFormation templates/stack history, or the AWS Console and enable unauthorized access.

This rule checks resources of type AWS::Amplify::App where Properties.BasicAuthConfig.EnableBasicAuth is set to true.

Resources.<name>.Properties.BasicAuthConfig.Password must not be a literal string.
Resources.<name>.Properties.BasicAuthConfig.Password must not be a Ref to a parameter whose Parameters.<param>.Default contains the secret.

Instead, store the credential in a secrets service and reference it from the template (or supply the value at deploy time without a Default). Templates that reference AWS Secrets Manager for the password or omit embedded/default secrets will satisfy this requirement.

Secure example using AWS Secrets Manager dynamic reference:

MySecret:
  Type: AWS::SecretsManager::Secret
  Properties:
    Name: my-amplify-basic-auth
    SecretString: '{"password":"REPLACE_WITH_SECURE_VALUE"}'

MyAmplifyApp:
  Type: AWS::Amplify::App
  Properties:
    BasicAuthConfig:
      EnableBasicAuth: true
      Username: admin
      Password: '{{resolve:secretsmanager:my-amplify-basic-auth:SecretString:password}}'

Compliant Code Examples

Resources:
     NewAmpApp-2:
        Type: AWS::Amplify::App
        Properties:
          BuildSpec: String
          CustomHeaders: String
          Description: String
          EnableBranchAutoDeletion: true
          IAMServiceRole: String
          Name: NewAmpApp
          OauthToken: String
          Repository: String
          BasicAuthConfig :
            EnableBasicAuth: true
            Password: !Sub '{{resolve:secretsmanager:${MyAmpAppSecretManagerRotater}::password}}'
            Username: !Sub '{{resolve:secretsmanager:${MyAmpAppSecretManagerRotater}::username}}'
     MyAmpAppSecretManagerRotater:
        Type: AWS::SecretsManager::Secret
        Properties:
          Description: 'This is my amp app instance secret'
          GenerateSecretString:
            SecretStringTemplate: '{"username": "admin"}'
            GenerateStringKey: 'password'
            PasswordLength: 16
            ExcludeCharacters: '"@/\'

Parameters:
  ParentPassword:
    Description: 'Password'
    Type: String
  ParentUsername:
    Description: 'Username'
    Type: String
Resources:
  NewAmpApp-1:
    Type: AWS::Amplify::App
    Properties:
      BuildSpec: String
      CustomHeaders: String
      Description: String
      EnableBranchAutoDeletion: true
      IAMServiceRole: String
      Name: NewAmpApp
      OauthToken: String
      Repository: String
      BasicAuthConfig:
        EnableBasicAuth: true
        Password: !Ref ParentPassword
        Username: !Ref ParentUsername

Parameters:
  ParentPassword:
    Description: 'Password'
    Type: String
    Default: ""
  ParentUsername:
    Description: 'Username'
    Type: String
    Default: ""
Resources:
  NewAmpApp-4:
    Type: AWS::Amplify::App
    Properties:
      BuildSpec: String
      CustomHeaders: String
      Description: String
      EnableBranchAutoDeletion: true
      IAMServiceRole: String
      Name: NewAmpApp
      OauthToken: String
      Repository: String
      BasicAuthConfig:
        EnableBasicAuth: true
        Password: !Ref ParentPassword
        Username: !Ref ParentUsername

Non-Compliant Code Examples

AWSTemplateFormatVersion: 2010-09-09
Resources:
  NewAmpApp-1:
    Type: AWS::Amplify::App
    Properties:
      BuildSpec: String
      CustomHeaders: String
      Description: String
      EnableBranchAutoDeletion: true
      IAMServiceRole: String
      Name: NewAmpApp
      OauthToken: String
      Repository: String
      BasicAuthConfig:
        EnableBasicAuth: true
        Password: "@skdsjdk0234!AB"
        Username: admin

AWSTemplateFormatVersion: 2010-09-09
Parameters:
  ParentPassword:
    Description: 'Password'
    Type: String
    Default: "@skdsjdk0234!AB"
  ParentUsername:
    Description: 'Username'
    Type: String
    Default: ""
Resources:
  NewAmpApp-4:
    Type: AWS::Amplify::App
    Properties:
      BuildSpec: String
      CustomHeaders: String
      Description: String
      EnableBranchAutoDeletion: true
      IAMServiceRole: String
      Name: NewAmpApp
      OauthToken: String
      Repository: String
      BasicAuthConfig:
        EnableBasicAuth: true
        Password: !Ref ParentPassword
        Username: !Ref ParentUsername