CVE-2021-32786 Open Redirect in oidc_validate_redirect_url()

2021-07-2200:00:00

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

6.6 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

55.4%

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, oidc_validate_redirect_url() does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring mod_auth_openidc to only allow redirection whose destination matches a given regular expression.

CNA Affected

[
  {
    "vendor": "zmartzone",
    "product": "mod_auth_openidc",
    "versions": [
      {
        "version": "< 2.4.9",
        "status": "affected"
      }
    ]
  }
]