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

2021-09-0300:00:00

CWE-601

GitHub_M

www.cve.org

4.7 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

6.4 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

61.3%

JSON

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.

CNA Affected

[
  {
    "vendor": "zmartzone",
    "product": "mod_auth_openidc",
    "versions": [
      {
        "version": "<=2.4.9.3",
        "status": "affected"
      }
    ]
  }
]