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.

CVSS v3 4.8 MEDIUM
CVSS v2.0 4.9 MEDIUM

4.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.7 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

4.9^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:S/C:P/I:P/A:N

Exploitability : 6.8 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bf	Patch Third Party Advisory
https://github.com/ory/fosite/security/advisories/GHSA-grfp-q2mm-hfp6	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:ory:fosite:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2020-10-02 21:15

Updated : 2024-02-28 18:08

NVD link : CVE-2020-15234

Mitre link : CVE-2020-15234

CVE.ORG link : CVE-2020-15234

JSON object : View

Products Affected

ory

fosite

CWE

CWE-178

Improper Handling of Case Sensitivity

CWE-20

Improper Input Validation

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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