GHSA-94vp-rmqv-5875
Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Packagist | october/cms | >= 1.0.319, < 1.0.469 | 1.0.469 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
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 469 (v1.0.469) and v1.1.0.
### Workarounds
Apply https://github.com/octobercms/october/compare/106daa2930de4cebb18732732d47d4056f01dd5b...7cb148c1677373ac30ccfd3069d18098e403e1ca to your installation manually if unable to upgrade to Build 469.
### References
Reported by [ka1n4t](https://github.com/ka1n4t)
### For more information
If you have any questions or comments about this advisory:
* Email us at [[email protected]](mailto:[email protected])
### 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">
References
External links from the advisory. They lead to third-party sites.