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Fencer Vulns
high 7.5

CVE-2024-24814 json

Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc

published 2024-02-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-22186

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

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.

Patch / fix

  • openidc mod_auth_openidc 2.4.15.2
  • libapache2-mod-auth-openidc Debian 12 2.4.12.3-2+deb12u1
  • libapache2-mod-auth-openidc Debian 14, Debian 13 2.4.15.7-1

debian advisories DEBIAN-CVE-2024-24814

  • mod_auth_openidc RHEL 9 2.4.10-1.el9
  • cjose RHEL 8 0.6.1-4.module+el8.10.0+21813+b5444eb8
  • mod_auth_openidc RHEL 8 2.4.9.4-6.module+el8.10.0+21813+b5444eb8

red hat advisories RHSA-2024:9180RHSA-2024:5289

  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP7, SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 2.4.17.1-150600.16.14.1
  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 2.3.8-150600.16.5.1
  • apache2-mod_auth_openidc SLES for SAP 12 SP5, SLES 12 SP5 2.4.0-7.12.2
  • apache2-mod_auth_openidc SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +12 more 2.3.8-150100.3.28.1

suse advisories SUSE-SU-2025:4532-1SUSE-SU-2024:2299-1SUSE-SU-2024:0758-1SUSE-SU-2024:0757-1

  • apache2-mod_auth_openidc openSUSE Tumbleweed 2.4.15.3-1.1

opensuse advisories openSUSE-SU-2024:13699-1

  • mod_auth_openidc AlmaLinux 9 2.4.10-1.el9
  • cjose AlmaLinux 8 0.6.1-4.module_el8.9.0+3631+0ced13d7
  • cjose AlmaLinux 8 0.6.1-4.module_el8.10.0+3881+234adf82
  • mod_auth_openidc AlmaLinux 8 2.4.9.4-6.module_el8.10.0+3881+234adf82

almalinux advisories ALSA-2024:9180ALSA-2024:5289

  • cjose Rocky Linux 8 0.6.1-4.module+el8.9.0+1384+4b58c166
  • mod_auth_openidc Rocky Linux 8 2.4.9.4-6.module+el8.10.0+1846+b7dcd2c3
  • mod_auth_openidc Rocky Linux 9 2.4.10-1.el9

rocky linux advisories RLSA-2024:5289RLSA-2024:9180

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-24814 updated cvss 7.5

mod_auth_openidc: DoS when using `OIDCSessionType client-cookie` and manipulating cookies

  • Red Hat Enterprise Linux 7 mod_auth_openidc
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) cjose 0.6.1-4.module+el8.10.0+21813+b5444eb8, mod_auth_openidc 2.4.9.4-6.module+el8.10.0+21813+b5444eb8
    fixed: vendor fix RHSA-2024:5289
  • Red Hat Enterprise Linux AppStream (v. 9) mod_auth_openidc 2.4.10-1.el9
    fixed: vendor fix RHSA-2024:9180

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-hxr6-w4gc-7vvv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenIDC mod_auth_openidc

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.