CVE-2024-24814: Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc
First published: Tue Feb 13 2024(Updated: )
mod_auth_openidc 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 mod_auth_openidc_session_chunks 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 mod_auth_openidc_session_chunks 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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/mod_auth_openidc | <2.4.15.2 | 2.4.15.2 |
| mod_auth_openidc | >=2.0.0<=2.4.15.1 | |
| Debian | =10.0 | |
| Fedora | =39 |
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Reference Links
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-hxr6-w4gc-7vvv
- https://github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7DKVEVREYAI4F46CQAVOTPL75WLOZOE/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00004.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2264093
- https://access.redhat.com/errata/RHSA-2024:5289
- https://access.redhat.com/errata/RHSA-2024:9180
- https://bugzilla.redhat.com/show_bug.cgi?id=2264092
Frequently Asked Questions
What is the severity of CVE-2024-24814?
CVE-2024-24814 has not been assigned a specific severity score yet.
How do I fix CVE-2024-24814?
To fix CVE-2024-24814, upgrade mod_auth_openidc to version 2.4.15.2 or later.
Which versions of mod_auth_openidc are affected by CVE-2024-24814?
All versions of mod_auth_openidc from 2.0.0 up to but not including 2.4.15.2 are affected by CVE-2024-24814.
Is CVE-2024-24814 a serious threat to my web server?
CVE-2024-24814 could potentially lead to unauthorized access if exploited, making it a potential threat depending on your web server configuration.
What can happen if CVE-2024-24814 is not fixed?
If CVE-2024-24814 is not fixed, it may allow attackers to exploit the vulnerability to gain unauthorized access to session data.
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