#VU46837 Permissions, Privileges, and Access Controls in Moodle - CVE-2020-25630

Vulnerability identifier: #VU46837

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25630

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the decompressed size of zip files is not checked against available user quota before unzipping them in the file picker unzip functionality. A remote attacker trick the victim to unzip a large archive and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 3.0 - 3.0.10, 3.1.0 beta - 3.1.18, 3.2.0 beta - 3.2.9, 3.3 - 3.3.9, 3.4.0 beta - 3.4.9, 3.5.0 beta - 3.5.13, 3.6.0 beta - 3.6.10, 3.7.0 beta - 3.7.7, 3.8.0 beta - 3.8.4, 3.9.0 - 3.9.1

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External links
https://moodle.org/mod/forum/discuss.php?d=410842

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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.