CVE-2021-33420: Replicator Replicator Vulnerable To Deserialization Of Vulnerability

CRITICAL
Advisory Identifier: GHSA-hw46-vg6w-88fj
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CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2021-33420 is a CRITICAL (CVSS 9.8) replicator vulnerable to deserialization of vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Replicator libraries in the npm ecosystem. The issue involves replicator vulnerable to deserialization of untrusted data. Remediation is available by upgrading affected packages to version 1.0.4.

CVE-2021-33420 at a Glance

CVE Identifier CVE-2021-33420
GHSA Identifier GHSA-hw46-vg6w-88fj
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Replicator
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-33420

To remediate this vulnerability, upgrade all affected Replicator dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

replicator fixed: 1.0.4 
npm install replicator@1.0.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls replicator

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-33420, inspect your project dependencies using npm:

npm ls replicator

Analyze the terminal output to locate any version of Replicator in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.4), your application is affected.

Note: The npm ls replicator command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Replicator, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A deserialization issue discovered in inikulin replicator before 1.0.4 allows remote attackers to run arbitrary code via the fromSerializable function in TypedArray object.

CVE-2021-33420 Affected Replicator Versions

1 component(s)
Fixed Versions:
1.0.4
Product / Package Ecosystem Affected Versions Fixed Version
replicator
npm/replicator
npm
< 1.0.4
1.0.4

References

NVD — CVE-2021-33420 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33420
Replicator Source Repository REPOSITORY
https://github.com/inikulin/replicator/issues/16
Replicator Source Repository REPOSITORY
https://github.com/inikulin/replicator/pull/17
Security Fix Commit FIX COMMIT
https://github.com/inikulin/replicator/commit/2c626242fb4a118855262c64b5731b2ce98e521b
advisory.checkmarx.net/advisory/cx-2021-47... WEB
https://advisory.checkmarx.net/advisory/CX-2021-4787
Replicator Source Repository REPOSITORY
https://github.com/inikulin/replicator

Frequently Asked Questions

What is CVE-2021-33420?
CVE-2021-33420 is a security vulnerability in Replicator involving replicator vulnerable to Deserialization of Untrusted Data under CWE-502: Deserialization of Untrusted Data.
Which Replicator versions are affected?
Affected versions include releases prior to 1.0.4 across affected packages: replicator.
What version fixes CVE-2021-33420?
Upgrading to 1.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is replicator affected?
Yes, replicator is affected in releases prior to 1.0.4. Upgrade your dependency to 1.0.4 or later.
What is the CVSS score of CVE-2021-33420?
CVE-2021-33420 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-33420?
CVE-2021-33420 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check npm dependencies for CVE-2021-33420?
Run the dependency tree command: 'npm ls replicator'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hw46-vg6w-88fj",
  "modified" : "2022-12-20T19:06:15Z",
  "published" : "2022-12-15T21:30:28Z",
  "aliases" : [ "CVE-2021-33420" ],
  "summary" : "replicator vulnerable to Deserialization of Untrusted Data",
  "details" : "A deserialization issue discovered in inikulin replicator before 1.0.4 allows remote attackers to run arbitrary code via the fromSerializable function in TypedArray object.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "replicator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-33420"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/inikulin/replicator/issues/16"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/inikulin/replicator/pull/17"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/inikulin/replicator/commit/2c626242fb4a118855262c64b5731b2ce98e521b"
  }, {
    "type" : "WEB",
    "url" : "https://advisory.checkmarx.net/advisory/CX-2021-4787"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/inikulin/replicator"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-15T23:31:51Z",
    "nvd_published_at" : "2022-12-15T19:15:00Z"
  }
}