CVE-2020-26231
Bypass of fix for CVE-2020-15247, Twig sandbox escape
Description
### Impact A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as CVE-2020-15247: 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. ### Patches Issue has been patched in Build 470 (v1.0.470) and v1.1.1. ### Workarounds Apply https://github.com/octobercms/october/commit/d34fb8ab51108495a9a651b841202d935f4e12f7 to your installation manually if unable to upgrade to Build 470 or v1.1.1. ### References Reported by [ka1n4t](https://github.com/ka1n4t) ### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com) ### Threat assessment: <img width="1108" alt="Screen Shot 2020-10-10 at 1 21 13 PM" src="https://user-images.githubusercontent.com/7253840/95663316-7de28b80-0afb-11eb-999d-a6526cf78709.png">
How to fix CVE-2020-26231
To remediate CVE-2020-26231, upgrade the affected package to a fixed version below.
- —upgrade to 1.0.470 or later
Is CVE-2020-26231 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 1.0.469, < 1.0.470