Description
The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.6 for the Apache HTTP Server does not skip OIDC_CLAIM_ and OIDCAuthNHeader headers in an "AuthType oauth20" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache2-mod-auth-openidc | 2.1.6-1 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.1.6-1 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.1.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | mod_auth_openidc | 1.8.8-5.el7 | RHSA-2019:2112 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | mod_auth_openidc | 1.8.8-5.amzn2 | ALAS2-2019-1329 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | mod_auth_openidc | 1.8.8-5.el7 | ELSA-2019-2112 |
Advisories 4
- WID-SEC-2022-0517 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2019:2112 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- ALAS2-2019-1329 Moderate: mod_auth_openidc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 23, 2019
- ELSA-2019-2112 Moderate: mod_auth_openidc security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 13, 2019
References
- https://github.com/pingidentity/mod_auth_openidc/blob/master/ChangeLog
- https://github.com/pingidentity/mod_auth_openidc/releases/tag/v2.1.6
- https://github.com/pingidentity/mod_auth_openidc/commit/21e3728a825c41ab41efa75e664108051bb9665e
- 96549 vdb-entry
- RHSA-2019:2112 vendor-advisory
- FEDORA-2019-7b06f18a10 vendor-advisory
- FEDORA-2019-23638d42f3 vendor-advisory
- FEDORA-2019-a25d5df3b4 vendor-advisory