CVE-2021-29456 Information

Description

Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

5.4