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How the Mentioned CVE Works
The vulnerability, CVE-2024-XXXXX, stems from a flaw in the Auth0-PHP SDK’s token validation logic. The SDK’s `JWTVerifier` class incorrectly validates the `aud` (audience) claim within JSON Web Tokens (JWT). During standard OAuth 2.0 or OpenID Connect flows, an application receives an ID token (for user identity) and an access token (for API authorization). Each has a specific, intended audience. The flawed validation routine fails to strictly enforce that an access token’s `aud` claim matches the API identifier of the receiving application. Consequently, an attacker can present a valid ID token—meant only for client-side user authentication—to an endpoint expecting an access token. The server-side SDK incorrectly accepts this ID token as a legitimate access token, potentially granting unauthorized access to protected resources or actions because the token’s scopes and intended use are not properly contested.
dailycve form:
Platform: Auth0-PHP SDK
Version: < 8.18.0
Vulnerability: Improper Audience Validation
Severity: Moderate
date: 2024-12-17
Prediction: 2024-12-17 Patched
What Undercode Say:
Analytics:
composer show auth0/auth0-php | grep versions grep -r "JWTVerifier" /app/src --include=".php" curl -s -H "Authorization: Bearer <ID_TOKEN>" https://api.target/v1/protected
How Exploit:
1. Attacker obtains ID token.
2. Forges request to API endpoint.
3. Submits ID token as Access Token.
4. SDK incorrectly validates token audience.
5. Unauthorized API access granted.
Protection from this CVE:
Upgrade to version 8.18.0. Implement strict audience verification manually. Enforce token type distinctions.
Impact:
Unauthorized API access. Potential privilege escalation. Data integrity breach.
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Sources:
Reported By: github.com
Extra Source Hub:
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