CVE-2020-15247: Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.
First published: Mon Nov 23 2020(Updated: )
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October CMS from version 1.0.319 and before version 1.0.469, an authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. Issue has been patched in Build 469 (v1.0.469) and v1.1.0.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Octobercms October | >=1.0.319<1.0.469 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-15247?
CVE-2020-15247 is a vulnerability in October CMS that allows an authenticated backend user to perform unauthorized actions.
What is the severity of CVE-2020-15247?
The severity of CVE-2020-15247 is medium, with a CVSS score of 5.2.
How can I exploit CVE-2020-15247?
You need to be an authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions to exploit CVE-2020-15247.
How do I fix CVE-2020-15247?
To fix CVE-2020-15247, update your October CMS installation to version 1.0.469 or later.
Where can I find more information about CVE-2020-15247?
You can find more information about CVE-2020-15247 on the October CMS GitHub page and the associated security advisories.
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