Open Redirect in Ory Fosite
CVE-2020-15234
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000
Affected products
- Ory Fosite — versions < 0.34.1
Weakness classification (CWE)
References
- github.com/ory/fosite/security/advisories/GHSA-grfp-q2mm-hfp6 (Third Party Advisory)
- github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bf (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15234?
- CVE-2020-15234 is a medium-severity vulnerability in Ory Fosite, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2020-10-02.
- How severe is CVE-2020-15234?
- Medium severity. CVSS v3 base score is 6.1 out of 10.