CVE-2024-33999 moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php
Attackers can inject malicious scripts via the HTTP Referer header in the MFA admin tool, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-33999?
CVE-2024-33999 is a critical cross-site scripting vulnerability in Moodle Moodle, published on 31 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The referrer URL used by MFA required additional sanitizing, rather than being used directly.
Weakness: CWE-20
Which versions are affected by CVE-2024-33999?
3 open source packages ship an affected version, including moodle/moodle and moodle. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
moodle/moodle Packagist | From 4.3.0 | 4.3.4 |
moodle/moodle Packagist | From 4.3.0 | 4.3.4 |
moodle Bitnami | From 4.3.0 | 4.3.4 |
Products include Moodle Moodle.
How do I fix CVE-2024-33999?
Upgrade moodle/moodle to 4.3.4 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2024-33999 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-33999 exists.
Other vulnerabilities in Moodle Moodle
- CVE-2006-4935 File upload in n/a
- CVE-2006-4936 Moodle does not properly validate module instance id
- CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
- CVE-2004-2235 Cross-site scripting in n/a
- CVE-2004-2236 Other in n/a
Sources
Also known as BIT-moodle-2024-33999, GHSA-r2wx-46gp-rp3h, UBUNTU-CVE-2024-33999.