Vulnerability identifier: #VU82188

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5539

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the Lesson activity. A remote user can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 4.2.0 - 4.2.2, 4.1.0 - 4.1.5, 4.0.0 - 4.0.10, 3.11 - 3.11.16, 3.9.0 - 3.9.23, 3.5.0 - 3.5.18, 3.8.0 - 3.8.9, 3.7.0 - 3.7.9, 3.3 - 3.3.9, 3.6.0 - 3.6.10, 3.1.0 - 3.1.18, 3.4.0 - 3.4.9, 3.2.0 - 3.2.9, 3.0 - 3.0.10, 2.9 - 2.9.9, 2.8 - 2.8.12, 2.7 - 2.7.20, 2.6 - 2.6.11, 2.5 - 2.5.9, 2.4 - 2.4.11, 2.3 - 2.3.11, 2.2 - 2.2.11, 2.1 - 2.1.10, 2.0 - 2.0.10, 1.4.0 - 1.4.5, 1.2 - 1.2.106-2, 1.0 - 1.0.9, 1.9 - 1.9.19, 1.8 - 1.8.14, 1.7 - 1.7.7, 1.6 - 1.6.9, 1.5 - 1.5.4, 1.3 - 1.3.5, 1.1.0 - 1.1.1

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External links
http://moodle.org/mod/forum/discuss.php?d=451580

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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.