Security controls bypass or absence In php-twig
Description
Twig has a possible sandbox bypass
Description
Under some circumstances, the sandbox security checks are not run which allows user-contributed templates to bypass the sandbox restrictions.
The security issue happens when all these conditions are met:
The sandbox is disabled globally;
The sandbox is enabled via a sandboxed include() function which references a template name (like included.twig) and not a Template or TemplateWrapper instance;
The included template has been loaded before the include() call but in a non-sandbox context (possible as the sandbox has been globally disabled).
Resolution
The patch ensures that the sandbox security checks are always run at runtime.
Credits
We would like to thank Fabien Potencier for reporting and fixing the issue.
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Aliases
References