modauthopenidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In affected versions missing input validation on modauthopenidcsessionchunks cookie value makes the server vulnerable to a denial of service (DoS) attack. An internal security audit has been conducted and the reviewers found that if they manipulated the value of the modauthopenidcsessionchunks cookie to a very large integer, like 99999999, the server struggles with the request for a long time and finally gets back with a 500 error. Making a few requests of this kind caused our server to become unresponsive. Attackers can craft requests that would make the server work very hard (and possibly become unresponsive) and/or crash with minimal effort. This issue has been addressed in version 2.4.15.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

modauthopenidc 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 modauthopenidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the targetlinkuri parameter. A patch in version 2.4.9.4 made it so that the OIDCRedirectURLsAllowed setting must be applied to the targetlinkuri parameter. There are no known workarounds aside from upgrading to a patched version.

The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka modauthopenidc) module before 2.1.6 for the Apache HTTP Server does not skip OIDCCLAIM and OIDCAuthNHeader headers in an "AuthType oauth20" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.

It was found that the OpenID Connect authentication module for Apache is vulnerable to Content Spoofing due to the user-supplied content being shown in the error pages.

Upstream bug:

https://github.com/pingidentity/modauthopenidc/issues/212

Upstream patch:

https://github.com/pingidentity/modauthopenidc/commit/612e309bfffd6f9b8ad7cdccda3019fc0865f3b4

The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka modauthopenidc) module before 2.1.5 for the Apache HTTP Server does not skip OIDCCLAIM and OIDCAuthNHeader headers in an "OIDCUnAuthAction pass" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.