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GHSA-xhw3-4j3m-hq53
No affected components available
Impact
Affected versions of Winter CMS allow users with access to the CMS templates sections that modify Twig files to bypass the sandbox placed on Twig files and modify resources such as theme customisation values or modify, or remove, templates in the theme even if not provided direct access via the permissions.
As all objects passed through to Twig are references to the live objects, it is also possible to also manipulate model data if models are passed directly to Twig, including changing attributes or even removing records entirely. In most cases, this is unwanted behavior and potentially dangerous.
To actively exploit this security issue, an attacker would need access to the Backend with a user account with any of the following permissions:
cms.manage_layoutscms.manage_pagescms.manage_partials
The Winter CMS maintainers strongly recommend that these permissions only be reserved to trusted administrators and developers in general.
Patches
In order to mitigate this issue, we have significantly increased the scope of the sandbox, effectively making all models and datasources read-only in Twig.
This security issue has been fixed as of https://github.com/wintercms/winter/commit/fb88e6fabde3b3278ce1844e581c87dcf7daee22.
Workarounds
If you cannot upgrade, you may apply commit https://github.com/wintercms/winter/commit/fb88e6fabde3b3278ce1844e581c87dcf7daee22 to your Winter CMS installation manually to resolve this issue.
In the rare event that you were relying on being able to write to models/datasources within your Twig templates, you should instead use or create components to make changes to your models.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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