Vulnerability Details : 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 category: Open redirectInput validation
Products affected by CVE-2020-15234
- cpe:2.3:a:ory:fosite:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-15234
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 17 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-15234
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:N/AC:M/Au:S/C:P/I:P/A:N |
6.8
|
4.9
|
NIST | |
|
4.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
1.7
|
2.7
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N |
0.9
|
5.2
|
GitHub, Inc. |
CWE ids for CVE-2020-15234
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: security-advisories@github.com (Secondary)
-
The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.Assigned by: nvd@nist.gov (Primary)
-
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2020-15234
-
https://github.com/ory/fosite/security/advisories/GHSA-grfp-q2mm-hfp6
Redirect URL matching ignores character casing · Advisory · ory/fosite · GitHubThird Party Advisory
-
https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bf
fix: make redirect URL checking more strict · ory/fosite@cdee51e · GitHubPatch;Third Party Advisory
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