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CVE ID: CVE-2021-32786

Last updated: May 10, 2022, 6:02 p.m.

Severity: MEDIUM


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.

Severity score: 4.9 Base score: 5.8 Exploitability score: 8.6 Confidentiality impact: PARTIAL Integrity impact: PARTIAL User interaction required: True Published: July 22, 2021, 10:15 p.m. Data type: CVE Data format: MITRE Assigner: Problem type: CWE-601 Reference url: Reference name: Reference source: MISC CVE version: 2.0 Vector string: AV:N/AC:M/Au:N/C:P/I:P/A:N Access vector: NETWORK Access complexity: MEDIUM Authentication: NONE Base severity: AcInsf info: False Obtain all priviledges: False User privilege: False Other privilege: False

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