OS Command Injection in Moodle spellchecker plugin



| Updated: 2023-01-09
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-21809
CWE-ID CWE-78
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Moodle
Web applications / Other software

Vendor moodle.org

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) OS Command Injection

EUVDB-ID: #VU54334

Risk: Low

CVSSv4.0: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2021-21809

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the default legacy spellchecker plugin. A remote administrator can pass specially crafted data to the application and execute arbitrary OS commands 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: 3.10.0

CPE2.3 External links

https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1277


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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



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