CVE-2021-43558 Cross-site Scripting in moodle

What is CVE-2021-43558?

CVE-2021-43558 is a medium-severity cross-site scripting vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 22 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.

Weakness: CWE-79

Which versions are affected by CVE-2021-43558?

7 open source packages ship an affected version, including moodle/moodle and moodle. It affects 3 products.

Products include Fedoraproject Extra Packages for Enterprise Linux, Fedoraproject Fedora, Moodle Moodle.

How do I fix CVE-2021-43558?

Upgrade moodle/moodle to a fixed version for your release line: 3.10.8, 3.11.4 or 3.9.11.

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-2021-43558 being exploited?

There is no known exploitation of CVE-2021-43558 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Extra Packages for Enterprise Linux

• CVE-2023-34152 Command injection in ImageMagick Critical 9.8
• CVE-2022-4170 Code injection in rxvt-unicode Critical 9.8
• CVE-2022-40315 Moodle Minor SQL injection risk in admin user browsing Critical 9.8
• CVE-2022-45152 Moodle blind Server-Side Request Forgery (SSRF) vulnerability in LTI provider library Critical 9.1
• CVE-2022-24882 Server side NTLM does not properly check parameters in FreeRDP Critical 9.1

All Fedoraproject Extra Packages for Enterprise Linux vulnerabilities

Sources

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

Also known as BIT-moodle-2021-43558, GHSA-wpfp-q843-v772, UBUNTU-CVE-2021-43558.