FKIE_CVE-2024-28121

Vulnerability from fkie_nvd - Published: 2024-03-12 20:15 - Updated: 2025-12-03 17:13
Summary
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.
References
security-advisories@github.comhttp://seclists.org/fulldisclosure/2024/Mar/16Exploit, Third Party Advisory
security-advisories@github.comhttps://github.com/stimulusreflex/stimulus_reflex/blob/0211cad7d60fe96838587f159d657e44cee51b9b/app/channels/stimulus_reflex/channel.rb#L83Technical Description
security-advisories@github.comhttps://github.com/stimulusreflex/stimulus_reflex/commit/538582d240439aab76066c72335ea92096cd0c7fPatch
security-advisories@github.comhttps://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.4.2Product, Release Notes
security-advisories@github.comhttps://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.5.0.rc4Product, Release Notes
security-advisories@github.comhttps://github.com/stimulusreflex/stimulus_reflex/security/advisories/GHSA-f78j-4w3g-4q65Exploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Mar/16Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/stimulusreflex/stimulus_reflex/blob/0211cad7d60fe96838587f159d657e44cee51b9b/app/channels/stimulus_reflex/channel.rb#L83Technical Description
af854a3a-2127-422b-91ae-364da2661108https://github.com/stimulusreflex/stimulus_reflex/commit/538582d240439aab76066c72335ea92096cd0c7fPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.4.2Product, Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.5.0.rc4Product, Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/stimulusreflex/stimulus_reflex/security/advisories/GHSA-f78j-4w3g-4q65Exploit, Vendor Advisory

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      "value": "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."
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  "id": "CVE-2024-28121",
  "lastModified": "2025-12-03T17:13:55.833",
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