MASWE-0018: Acesso às Cryptographic Keys Não Restrito

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Initial Description or Hints

Garantir que as chaves criptográficas sejam acessíveis apenas sob condições rigorosas, como quando o dispositivo é desbloqueado por um usuário autenticado, dentro de contextos seguros de aplicativo, vinculadas ao dispositivo atual ou por períodos limitados de tempo, é fundamental para manter a confidencialidade e a integridade dos dados criptografados.

Relevant Topics

• from a Background Process
• locked device (iOS kSecAttrAccessibleWhenUnlockedThisDeviceOnly, Android setUnlockedDeviceRequired)
• device-bound or non-transferable (iOS ThisDeviceOnly)
• time-based access (duration)
• Require User Presence
• application-specific password
• biometric authentication
• key use restricted e.g. requiring user auth with biometrics, User Presence.
• especially for sensitive operations
• keys restricted/authorized for a duration of time or specific crypto operation, etc.

References

• https://developer.android.com/reference/android/security/keystore/KeyGenParameterSpec.Builder#setUnlockedDeviceRequired(boolean)
• https://developer.apple.com/documentation/security/ksecattraccessiblewhenunlockedthisdeviceonly
• https://developer.android.com/training/sign-in/biometric-auth#prompt-the-user-to-authenticate-with-biometrics
• https://developer.apple.com/documentation/security/restricting-keychain-item-accessibility

MASTG v1 Coverage

No MASTG v1 tests are related to this weakness.