Advisories for Composer/Twig/Twig package

When using the ?? operator, output escaping was missing for the expression on the left side of the operator.

In a sandbox, an attacker can call __toString() on an object even if the __toString() method is not allowed by the security policy when the object is part of an array or an argument list (arguments to a function or a filter for instance).

In a sandbox, and attacker can access attributes of Array-like objects as they were not checked by the security policy. They are now checked via the property policy and the __isset() method is now called after the security check. This is a BC break.

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 …

Twig is affected by path traversal vulnerability when used with Twig_Loader_Filesystem for loading Twig templates but only if the application is using non-trusted template names (names provided by a end-user for instance). When affected, it is possible to go up one directory for the paths configured in the application's loader. For instance, if the filesystem loader is configured with /path/to/templates as a path to look for templates, an attacker can …

Twig is a template language for PHP. Versions 1.x prior to 1.44.7, 2.x prior to 2.15.3, and 3.x prior to 3.4.3 encounter an issue when the filesystem loader loads templates for which the name is a user input. It is possible to use the source or include statement to read arbitrary files from outside the templates' directory when using a namespace like @somewhere/../some.file. In such a case, validation is bypassed. …

The displayBlock function Template.php in Sensio Labs Twig before 1.20.0, when Sandbox mode is enabled, allows remote attackers to execute arbitrary code via the _self variable in a template.

Twig is an open source template language for PHP.Patched versions now disallow calling non Closure in the sort filter as is the case for some other filters. Users are advised to upgrade.

Under some circumstances, it is possible to call the __toString() method on an object even if not allowed by the security policy in place.

Sandbox Information Disclosure.

Your application is affected if you allow end users to submit Twig templates, even if you protected this template with Twig's sandbox mode. End users can craft valid Twig code that allows them to execute arbitrary code (RCEs) via the _self variable, which is always available, even in sandboxed templates.

Remote code execution in templates.

Vulnerability in the filesystem loader.