CVE-2021-39191 MEDIUM

CVE-2021-39191: URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc

Vendor Zmartzone
Product mod_auth_openidc
Weakness CWE-601 · Open redirect
Published September 3, 2021
Last update August 4, 2024
View on NVD All CVEs

CVSS base score

4.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.

Key dates

02Disclosure timeline

September 3, 2021 CVE published
August 4, 2024 Record updated