OS Command Injection in Moodle spellchecker plugin
| 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 Subscribe |
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
CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
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
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMoodle: 3.10.0
External linkshttp://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.
