CVE-2021-39191

Description

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.

Related CPE's

CvssV3 impact

Version

3.1

VectorString

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

AttackVector

NETWORK

AttackComplexity

LOW

PrivilegesRequired

NONE

UserInteraction

REQUIRED

Scope

CHANGED

ConfidentialityImpact

LOW

IntegrityImpact

LOW

AvailabilityImpact

NONE

BaseScore

6.1

BaseSeverity

MEDIUM

CvssV2 impact

AccessComplexity

MEDIUM

ConfidentialityImpact

PARTIAL

AvailabilityImpact

NONE

IntegrityImpact

PARTIAL

BaseScore

5.8

VectorString

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

Version

2.0

AccessVector

NETWORK

Authentication

NONE