In yiisoft/yii2 version 2.0.48, the base Component class contains a vulnerability where the `__set()` magic method does not validate that the value passed is a valid Behavior class name or configuration. This allows an attacker to instantiate arbitrary classes, passing parameters to their constructors and invoking setter methods. Depending on the installed dependencies, various types of attacks are possible, including the execution of arbitrary code, retrieval of sensitive information, and unauthorized access.

Affected: Packagist: yiisoft/yii2

Yii2 supports attaching Behaviors to Components by setting properties having the format `'as <behaviour-name>'`.

Internally this is done using the `__set()` magic method. If the value passed to this method is not an instance of the `Behavior` class, a new object is instantiated using `Yii::createObject($value)`. However, there is no validation check that verifies that `$value` is a valid `Behavior` class name or configuration. An attacker that can control the content of the $value variable can then instantiate arbitrary classes, passing parameters to their constructors and then invoking setter methods.

### Impact With some effort malicious code can be injected executed which might be anything ranging from deleting files to dropping database tables

### Patches Not yet patched.

### Workarounds No Work around available

### References Reported [Here](https://huntr.com/bounties/4fbdd965-02b6-42e4-b57b-f98f93415b8f?token=3bcfc5266870680af19a26170b8dbf3750e3b593ce192da8eaa6a03f96b99b52c419e15768c56f23991dc50003aa1a9e3cb3f1f9321e18bd506d68a9f937cd5b7ca90fb47967df22c8768c0c48f7206f36b583464af7e44bf93eecc5398a2764b98e02cf8e280397785106db16e4197951554eb9b9c46649f4339e2f413cf6a0197ab2e0)

in case the link is dead, here is the full description

# Description

Yii2 supports attaching Behaviors to Components by setting properties having the format `'as <behaviour-name>'`.

Internally this is done using the `__set()` magic method. If the value passed to this method is not an instan…