October/System authenticated file write leads to remote code execution
Date: 2022-01
Affected: composer/october/system, composer/october/system
Attack vector: rce
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2021-32649
CWE: CWE-74
CWE-94
CVSS: 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

### Impact Assuming an attacker with "create, modify and delete website pages" privileges in the backend is able to execute PHP code by running specially crafted Twig code in the template markup. ### Patches Issue has been patched in Build 473 and v1.1.6 ### Workarounds Apply https://github.com/octobercms/october/commit/167b592eed291ae1563c8fcc5b9b34a03a300f26 to your installation manually if you are unable to upgrade. ### References Credits to: • David Miller ### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com)


Mitigations:

Architectural layers (MAESTRO):