Vulnerability identifier: #VU56753

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40691

CWE-ID: CWE-384

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to hijack the target user's session.

The weakness exists due to a session hijack risk in the Shibboleth authentication plugin. A remote attacker can obtain sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 3.9.0 - 3.9.9, 3.10.0 - 3.10.6, 3.11.0 - 3.11.2

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External links
http://moodle.org/mod/forum/discuss.php?d=427103

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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.