Prototype Pollution in json-logic-js

2020-11-12T19:36:14
ID GHSA-M9HW-7XFV-WQG7
Type github
Reporter GitHub Advisory Database
Modified 2020-11-12T19:36:14

Description

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" ] }