#VU51480 Improper access control in Moodle - CVE-2021-20283

Vulnerability identifier: #VU51480

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20283

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. The web service responsible for fetching other users' enrolled courses did not validate that the requesting user had permission to view that information in each course. A remote user can gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 3.5.0 beta - 3.5.16, 3.6.0 beta - 3.6.10, 3.7.0 beta - 3.7.9, 3.8.0 beta - 3.8.7, 3.9.0 - 3.9.4, 3.10.0 - 3.10.1

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External links
https://moodle.org/mod/forum/discuss.php?d=419654

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.