CVE-2024-24814

Public Exploit
Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.19%
Vendor Advisory github.com
Affected: OpenIDC mod_auth_openidc
Published at:
Updated at:

References

Link Tags
https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-hxr6-w4gc-7vvv exploit vendor advisory
https://github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7DKVEVREYAI4F46CQAVOTPL75WLOZOE/ third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2024/03/msg00004.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2024-24814?
CVE-2024-24814 has been scored as a high severity vulnerability.
How to fix CVE-2024-24814?
To fix CVE-2024-24814, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-24814 being actively exploited in the wild?
It is possible that CVE-2024-24814 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-24814?
CVE-2024-24814 affects OpenIDC mod_auth_openidc.
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