CVE-2024-21658: discourse calendar DoS — Fix

Description

discourse-calendar is a discourse plugin which adds the ability to create a dynamic calendar in the first post of a topic. The limit on region value length is too generous. This allows a malicious actor to cause a Discourse instance to use excessive bandwidth and disk space. This issue has been patched in main the main branch. There are no workarounds for this vulnerability. Please upgrade as soon as possible.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
discourse	discourse_calendar	< 2024-08-28

References

Advisories & Patches

https://github.com/discourse/discourse-calendar/security/advisories/GHSA-65f2-9ghp-x8h8

Frequently Asked Questions

What is CVE-2024-21658? +

discourse-calendar is a discourse plugin which adds the ability to create a dynamic calendar in the first post of a topic. The limit on region value length is too generous. This allows a malicious actor to cause a Discourse instance to use excessive bandwidth and disk space. This issue has been patched in main the main branch. There are no workarounds for this vulnerability. Please upgrade as soon as possible. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2024-21658? +

CVE-2024-21658 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-21658? +

CVE-2024-21658 affects products from discourse, specifically: discourse_calendar. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-21658? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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