Description
A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10. A specially crafted series of HTTP requests can lead to command execution. An attacker must have administrator privileges to exploit this vulnerabilities.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Moodle | Moodle 3.10 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | moodle | No fix yet | — |
| Ubuntu Pro 16.04 LTS | moodle | No fix yet | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
-
Moodle SpellChecker Path Authenticated Remote Command Execution
exploit/multi/http/moodle_spelling_path_rce
GitHub 1 repository
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anldori/CVE-2021-21809 ★ 1 · Dec 20, 2022
CVE-2021-21809 POC
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | moodle/moodle | 3.10.0 | — | GHSA-c7jj-vfmr-j9mj |
| Packagist | moodle/moodle | 3.11.2 | — | GHSA-c7jj-vfmr-j9mj |
| Packagist | moodle/moodle | 3.8.0 | — | GHSA-c7jj-vfmr-j9mj |