CVE-2024-28121
Description
stimulus_reflex is a system to extend the capabilities of both Rails and Stimulus by intercepting user interactions and passing them to Rails over real-time websockets. In affected versions more methods than expected can be called on reflex instances. Being able to call some of them has security implications. To invoke a reflex a websocket message of the following shape is sent: `\"target\":\"[class_name]#[method_name]\",\"args\":[]`. The server will proceed to instantiate `reflex` using the provided `class_name` as long as it extends `StimulusReflex::Reflex`. It then attempts to call `method_name` on the instance with the provided arguments. This is problematic as `reflex.method method_name` can be more methods that those explicitly specified by the developer in their reflex class. A good example is the instance_variable_set method. This vulnerability has been patched in versions 3.4.2 and 3.5.0.rc4. Users unable to upgrade should: see the backing GHSA advisory for mitigation advice.
How to fix
- stimulus_reflex3.5.0.rc4, 3.4.2, 3.5.0-rc4 or later
- stimulusreflex stimulusrelfex3.4.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| stimulus_reflexRubyGems | 3.5.0.pre0 ≤ v < 3.5.0.rc4, v < 3.4.2, 3.5.0-pre0 ≤ v < 3.5.0-rc4 | 3.5.0.rc4, 3.4.2, 3.5.0-rc4 |
| stimulusreflex stimulusrelfex | v < 3.4.2, 3.5.0 | 3.4.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.