CVE-2020-15234
Last modified
CVE-2020-15234 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.82% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ory | Fosite | < 0.34.1 |
References
- https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bfPatch, Third Party Advisory
- https://github.com/ory/fosite/security/advisories/GHSA-grfp-q2mm-hfp6Third Party Advisory
- https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bfPatch, Third Party Advisory
- https://github.com/ory/fosite/security/advisories/GHSA-grfp-q2mm-hfp6Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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