CVE-2024-24827: discourse DoS — Fix

Description

Discourse is an open source platform for community discussion. Without a rate limit on the POST /uploads endpoint, it makes it easier for an attacker to carry out a DoS attack on the server since creating an upload can be a resource intensive process. Do note that the impact varies from site to site as various site settings like `max_image_size_kb`, `max_attachment_size_kb` and `max_image_megapixels` will determine the amount of resources used when creating an upload. The issue is patched in the latest stable, beta and tests-passed version of Discourse. Users are advised to upgrade. Users unable to upgrade should reduce `max_image_size_kb`, `max_attachment_size_kb` and `max_image_megapixels` as smaller uploads require less resources to process. Alternatively, `client_max_body_size` can be reduced in Nginx to prevent large uploads from reaching the server.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
discourse	discourse	< 3.2.0
discourse	discourse	< 3.3.0

References

Advisories & Patches

https://github.com/discourse/discourse/commit/003b80e62f97cd8c0114d6b9d3f93c10443e6fae https://github.com/discourse/discourse/commit/003b80e62f97cd8c0114d6b9d3f93c10443e6fae

Other References

https://github.com/discourse/discourse/security/advisories/GHSA-58vw-246g-fjj4 https://github.com/discourse/discourse/security/advisories/GHSA-58vw-246g-fjj4

Frequently Asked Questions

What is CVE-2024-24827? +

Discourse is an open source platform for community discussion. Without a rate limit on the POST /uploads endpoint, it makes it easier for an attacker to carry out a DoS attack on the server since creating an upload can be a resource intensive process. Do note that the impact varies from site to site as various site settings like `max_image_size_kb`, `max_attachment_size_kb` and `max_image_megapixels` will determine the amount of resources used when creating an upload. The issue is patched in the latest stable, beta and tests-passed version of Discourse. Users are advised to upgrade. Users unable to upgrade should reduce `max_image_size_kb`, `max_attachment_size_kb` and `max_image_megapixels` as smaller uploads require less resources to process. Alternatively, `client_max_body_size` can be reduced in Nginx to prevent large uploads from reaching the server. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-24827? +

CVE-2024-24827 has a CVSS v3.1 score of 5.3 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-2024-24827? +

CVE-2024-24827 affects products from discourse, specifically: discourse. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-24827? +

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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