#VU89539 Security features bypass in Moodle - CVE-2024-33999

Vulnerability identifier: #VU89539

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-33999

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php. A remote attacker can bypass authentication.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 4.3.0 - 4.3.3

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External links
https://moodle.org/mod/forum/discuss.php?d=458387
https://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-80878

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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