CVE-2021-36396 Moodle vulnerable to Server-Side Request Forgery

What is CVE-2021-36396?

CVE-2021-36396 is a high-severity server-side request forgery vulnerability in Moodle Moodle, published on 6 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF risk.

Weakness: CWE-918

Which versions are affected by CVE-2021-36396?

7 open source packages ship an affected version, including moodle/moodle and moodle. It affects 1 product.

Products include Moodle Moodle.

How do I fix CVE-2021-36396?

Upgrade moodle/moodle to a fixed version for your release line: 3.9.8, 3.10.5 or 3.11.1.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2021-36396 being exploited?

There is no known exploitation of CVE-2021-36396 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Moodle Moodle

• CVE-2006-4935 File upload in n/a Critical 10.0
• CVE-2006-4936 Moodle does not properly validate module instance id Critical 10.0
• CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors. Critical 10.0
• CVE-2004-2235 Cross-site scripting in n/a Critical 10.0
• CVE-2004-2236 Other in n/a Critical 10.0

All Moodle Moodle vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-moodle-2021-36396, GHSA-4rmj-w58m-fvch, UBUNTU-CVE-2021-36396.