Kurz gesagt
- CVE-2020-15234 ist eine Schwachstelle (MITTEL (CVSS 4.8)) in github.com/ory/fosite, fosite (ory).
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.84%, höher als bei 57.9% aller Schwachstellen.
- Abhilfe: auf 0.34.1 oder neuer aktualisieren.
Description
Impact
Before version v0.34.1, the OAuth 2.0 Client's registered redirect URLs and the redirect URL provided at the OAuth2 Authorization Endpoint where compared using strings.ToLower while they should have been compared with a simple string match:
- Registering a client with allowed redirect URL
https://example.com/callback
- Performing OAuth2 flow and requesting redirect URL
https://example.com/CALLBACK
- Instead of an error (invalid redirect URL), the browser is redirected to
https://example.com/CALLBACK with a potentially successful OAuth2 response, depending on the state of the overall OAuth2 flow (the user might still deny the request for example).
NVD description
ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite before version 0.34.1, the OAuth 2.0 Client's registered redirect URLs and the redirect URL provided at the OAuth2 Authorization Endpoint where compared using strings.ToLower while they should have been compared with a simple string match. This allows an attacker to register a client with allowed redirect URL https://example.com/callback. Then perform an OAuth2 flow and requesting redirect URL https://example.com/CALLBACK. Instead of an error (invalid redirect URL), the browser is redirected to https://example.com/CALLBACK with a potentially successful OAuth2 response, depending on the state of the overall OAuth2 flow (the user might still deny the request for example). This vulnerability has been patched in ORY Fosite v0.34.1.
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