← Back to CVEs

CVE-2021-32786

MEDIUM

4.7

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, `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.

CVE Details

CVSS v3.1 Score4.7

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published7/22/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

apache:http_serverfedoraproject:fedoraopenidc:mod_auth_openidc

Weaknesses (CWE)

CWE-601CWE-601

References

https://daniel.haxx.se/blog/2017/01/30/one-url-standard-please/(security-advisories@github.com)

https://github.com/zmartzone/mod_auth_openidc/commit/3a115484eb927bc6daa5737dd84f88ff4bbc5544(security-advisories@github.com)

https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9(security-advisories@github.com)

https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-xm4c-5wm5-jqv7(security-advisories@github.com)

https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html(security-advisories@github.com)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZVF6BSJLRQZ7PFFR4X5JSU6KUJYNOCU/(security-advisories@github.com)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QXAWKPT5LXZSUTFSJ6IWSZC7RMYYQXQD/(security-advisories@github.com)

https://security.netapp.com/advisory/ntap-20210902-0001/(security-advisories@github.com)

https://www.oracle.com/security-alerts/cpuapr2022.html(security-advisories@github.com)

https://daniel.haxx.se/blog/2017/01/30/one-url-standard-please/(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/zmartzone/mod_auth_openidc/commit/3a115484eb927bc6daa5737dd84f88ff4bbc5544(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-xm4c-5wm5-jqv7(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZVF6BSJLRQZ7PFFR4X5JSU6KUJYNOCU/(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QXAWKPT5LXZSUTFSJ6IWSZC7RMYYQXQD/(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210902-0001/(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuapr2022.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.