Refresh token is exposed

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Metadata

Id: cloudformation-aws-refresh-token-is-exposed

Provider: AWS

Platform: CloudFormation

Severity: High

Category: Secret Management

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Description

Storing an Alexa skill’s refresh token as a plaintext value in an AWS CloudFormation template exposes a sensitive credential to source control, CI/CD logs, and anyone with template access. This can enable unauthorized skill access or account compromise. For Alexa::ASK::Skill resources, AuthenticationConfiguration.RefreshToken must be a string that uses a CloudFormation dynamic reference to a secure store. It should start with {{resolve:secretsmanager: or {{resolve:ssm-secure:. Resources missing this property, with a non-string value, or with a literal token will be flagged as insecure.

Secure examples using dynamic references:

MyAlexaSkillWithSecretsManager:
  Type: Alexa::ASK::Skill
  Properties:
    AuthenticationConfiguration:
      RefreshToken: "{{resolve:secretsmanager:my/alexa/refresh:SecretString:refresh_token}}"

MyAlexaSkillWithSsm:
  Type: Alexa::ASK::Skill
  Properties:
    AuthenticationConfiguration:
      RefreshToken: "{{resolve:ssm-secure:/alexa/refresh-token:1}}"

Compliant Code Examples

Resources:
  MySkill:
    Type: "Alexa::ASK::Skill"
    Properties:
      SkillPackage:
        S3Bucket: "my-skill-packages"
        S3Key: "skillpackage.zip"
        S3BucketRole: !GetAtt S3BucketReadRole.Arn
        Overrides:
          Manifest:
            apis:
              custom:
                endpoint:
                  uri: !GetAtt SkillFunction.Arn
      AuthenticationConfiguration:
        ClientId: "amzn1.application-oa2-client.1234"
        ClientSecret: "1234"
        RefreshToken: "{{resolve:secretsmanager:Atzr|IQEBLzAtAhRPpMJxdwVz2Nn6f2y-tpJX2DeX}}"
      VendorId: "1234"
  MySkill2:
    Type: "Alexa::ASK::Skill"
    Properties:
      SkillPackage:
        S3Bucket: "my-skill-packages"
        S3Key: "skillpackage.zip"
        S3BucketRole: !GetAtt S3BucketReadRole.Arn
        Overrides:
          Manifest:
            apis:
              custom:
                endpoint:
                  uri: !GetAtt SkillFunction.Arn
      AuthenticationConfiguration:
        ClientId: "amzn1.application-oa2-client.1234"
        ClientSecret: "1234"
        RefreshToken: "{{resolve:ssm-secure:Atzr|IQEBLzAtAhRPpMJxdwVz2Nn6f2y-tpJX2DeX}}"
      VendorId: "1234"

Non-Compliant Code Examples

Resources:
  MySkill:
    Type: "Alexa::ASK::Skill"
    Properties:
      SkillPackage:
        S3Bucket: "my-skill-packages"
        S3Key: "skillpackage.zip"
        S3BucketRole: !GetAtt S3BucketReadRole.Arn
        Overrides:
          Manifest:
            apis:
              custom:
                endpoint:
                  uri: !GetAtt SkillFunction.Arn
      AuthenticationConfiguration:
        ClientId: "amzn1.application-oa2-client.1234"
        ClientSecret: "1234"
        RefreshToken: "Atzr|1234"
      VendorId: "1234"