使用Cognito的AWS S3托管安全性及Cognito权限风险问询

Great question—this is a common concern when working with Cognito and client-side config files. Let’s break this down clearly:

Short Answer #

Yes, technically someone could use these values to write code that interacts with your Cognito User Pool, but what they can actually do is strictly limited by your User Pool and App Client configuration.

Detailed Explanation #

First, it’s important to understand: your userPoolId and userPoolWebClientId are not considered sensitive secrets by AWS. These values are designed to be publicly accessible—they’re required for Cognito’s client-side SDKs to communicate with the service. That said, here’s what attackers could (and couldn’t) do:

• User Creation: By default, Cognito allows unauthenticated users to call the SignUp API to create new accounts. If you don’t want this, you can disable it by adjusting your User Pool’s App client settings to restrict unauthenticated access, or configuring IAM permissions to block the cognito-idp:SignUp action for untrusted entities.
• User Verification: Actions like ConfirmSignUp require a verification code sent directly to the user’s email or phone number. Even if someone has your client ID, they can’t complete this step without access to that unique code.
• Authenticated Actions: Operations like logging in (AuthenticateUser), updating user attributes, or deleting accounts require valid user credentials (username/password) or a valid ID token. Without these, an attacker can’t perform any actions on existing user accounts.

Critical Security Best Practices #

To minimize risk, make sure you have these configurations in place:

• Restrict OAuth Settings: In your App client’s OAuth 2.0 settings, limit allowed callback URLs, sign-out URLs, and OAuth scopes to only your trusted domains. This prevents authorization code hijacking attacks.
• Disable Client Secrets for Web Apps: For web applications, never generate a client secret for your Cognito App client—web apps can’t securely store secrets, and exposing them would create a real security risk.
• Enable Advanced Security Mode: Turn on Cognito’s Advanced Security Mode to detect and block suspicious login attempts (like brute-force attacks).
• Limit Unauthenticated Permissions: If using a Cognito Identity Pool, restrict the permissions assigned to unauthenticated identities to only the APIs they absolutely need (e.g., don’t grant full access to your User Pool).

内容的提问来源于stack exchange，提问作者VV75