CVE-2023-44382: October CMS safe mode bypass using Twig sandbox escape
Impact
An authenticated backend user with the editor.cmspages, editor.cmslayouts, or editor.cmspartials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.safemode being enabled can write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.
This is not a problem for anyone who trusts their users with those permissions to usually write and manage PHP within the CMS by not having cms.safemode enabled. Still, it would be a problem for anyone relying on cms.safemode to ensure that users with those permissions in production do not have access to write and execute arbitrary PHP.
Patches
This issue has been patched in v3.4.15.
Workarounds
As a workaround, remove the specified permissions from untrusted users.
References
Credits to: - Vasiliy Bodrov
For more information If you have any questions or comments about this advisory: Email us at hello@octobercms.com
Other sources
October is a Content Management System (CMS) and web platform to assist with development workflow. An authenticated backend user with the editor.cmspages, editor.cmslayouts, or editor.cmspartials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.safemode being enabled can write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This issue has been patched in 3.4.15.
Affected Software
Event History
Frequently Asked Questions
What is the impact of CVE-2023-44382?
An authenticated backend user with certain permissions can execute PHP code.
How can an attacker exploit CVE-2023-44382?
By writing specific Twig code to escape the Twig sandbox.
Which version of October CMS is affected by CVE-2023-44382?
Version 3.0.0 up to and including 3.4.15 of October CMS is affected.
How can I remediate CVE-2023-44382?
Upgrade to version 3.4.15 of October CMS.
Where can I find more information about CVE-2023-44382?
You can find more information at the following references: [GitHub Advisory](https://github.com/octobercms/october/security/advisories/GHSA-p8q3-h652-65vx) [GitHub advisory](https://github.com/advisories/GHSA-p8q3-h652-65vx)