Headline
CVE-2023-30547: Handle host errors captured in Promises · patriksimek/vm2@f3db4de
vm2 is a sandbox that can run untrusted code with whitelisted Node’s built-in modules. There exists a vulnerability in exception sanitization of vm2 for versions up to 3.9.16, allowing attackers to raise an unsanitized host exception inside handleException() which can be used to escape the sandbox and run arbitrary code in host context. This vulnerability was patched in the release of version 3.9.17 of vm2. There are no known workarounds for this vulnerability. Users are advised to upgrade.
@@ -439,23 +439,36 @@ global.eval = new LocalProxy(localEval, EvalHandler);
* Promise sanitization
*/
if (localPromise && !allowAsync) {
if (localPromise) {
const PromisePrototype = localPromise.prototype;
overrideWithProxy(PromisePrototype, 'then’, PromisePrototype.then, AsyncErrorHandler);
// This seems not to work, and will produce
// UnhandledPromiseRejectionWarning: TypeError: Method Promise.prototype.then called on incompatible receiver [object Object].
// This is likely caused since the host.Promise.prototype.then cannot use the VM Proxy object.
// Contextify.connect(host.Promise.prototype.then, Promise.prototype.then);
if (!allowAsync) {
overrideWithProxy(PromisePrototype, 'then’, PromisePrototype.then, AsyncErrorHandler);
// This seems not to work, and will produce
// UnhandledPromiseRejectionWarning: TypeError: Method Promise.prototype.then called on incompatible receiver [object Object].
// This is likely caused since the host.Promise.prototype.then cannot use the VM Proxy object.
// Contextify.connect(host.Promise.prototype.then, Promise.prototype.then);
} else {
overrideWithProxy(PromisePrototype, 'then’, PromisePrototype.then, {
__proto__: null,
apply(target, thiz, args) {
if (args.length > 1) {
const onRejected = args[1];
if (typeof onRejected === ‘function’) {
args[1] = function wrapper(error) {
error = ensureThis(error);
return localReflectApply(onRejected, this, [error]);
};
}
}
return localReflectApply(target, thiz, args);
}
});
if (PromisePrototype.finally) {
overrideWithProxy(PromisePrototype, 'finally’, PromisePrototype.finally, AsyncErrorHandler);
// Contextify.connect(host.Promise.prototype.finally, Promise.prototype.finally);
}
if (Promise.prototype.catch) {
overrideWithProxy(PromisePrototype, 'catch’, PromisePrototype.catch, AsyncErrorHandler);
// Contextify.connect(host.Promise.prototype.catch, Promise.prototype.catch);
}
}
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There exists a vulnerability in exception sanitization of vm2 for versions up to 3.9.16, allowing attackers to raise an unsanitized host exception inside `handleException()` which can be used to escape the sandbox and run arbitrary code in host context. ### Impact A threat actor can bypass the sandbox protections to gain remote code execution rights on the host running the sandbox. ### Patches This vulnerability was patched in the release of version `3.9.17` of `vm2`. ### Workarounds None. ### References PoC - https://gist.github.com/leesh3288/381b230b04936dd4d74aaf90cc8bb244 ### For more information If you have any questions or comments about this advisory: - Open an issue in [VM2](https://github.com/patriksimek/vm2) Thanks to [Xion](https://twitter.com/0x10n) (SeungHyun Lee) of [KAIST Hacking Lab](https://kaist-hacking.github.io/) for disclosing this vulnerability.
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