CVE-2021-23410: Msgpack Deserialization Of Untrusted Data Vulnerability

CRITICAL
Advisory Identifier: GHSA-mx67-wv8x-hvv9
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CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2021-23410 is a CRITICAL (CVSS 9.8) deserialization of untrusted data vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Msgpack libraries in the npm ecosystem. The issue involves deserialization of untrusted data in msgpack. Remediation is available in the latest vendor maintenance releases.

CVE-2021-23410 at a Glance

CVE Identifier CVE-2021-23410
GHSA Identifier GHSA-mx67-wv8x-hvv9
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Msgpack
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-2021-23410

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

msgpack fixed: Latest secure release 
npm install msgpack@Latest secure release
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 msgpack

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23410, inspect your project dependencies using npm:

npm ls msgpack

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

Note: The npm ls msgpack 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 Msgpack, 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

# Withdrawn This advisory was withdrawn by its CNA (Snyk). ## Original advisory All versions of package `msgpack` are vulnerable to Deserialization of Untrusted Data via the unpack function. This does not affect the similarly named package `@msgpack/msgpack`.

CVE-2021-23410 Affected Msgpack Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
msgpack
npm/msgpack
npm
≤ 1.0.3

References

NVD — CVE-2021-23410 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23410
Msgpack Source Repository REPOSITORY
https://github.com/msgpack/msgpack-node
Msgpack Source Repository REPOSITORY
https://github.com/msgpack/msgpack-node/blob/master/src/msgpack.cc%23L302-L335
snyk.io/vuln/snyk-js-msgpac... WEB
https://snyk.io/vuln/SNYK-JS-MSGPACK-1296122

Frequently Asked Questions

What is CVE-2021-23410?
CVE-2021-23410 is a security vulnerability in Msgpack involving Deserialization of Untrusted Data in msgpack under CWE-502: Deserialization of Untrusted Data.
Which Msgpack versions are affected?
Affected versions include releases prior to current release patches across affected packages: msgpack.
What version fixes CVE-2021-23410?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is msgpack affected?
Yes, msgpack is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2021-23410?
CVE-2021-23410 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-2021-23410?
CVE-2021-23410 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-2021-23410?
Run the dependency tree command: 'npm ls msgpack'. 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-mx67-wv8x-hvv9",
  "modified" : "2021-09-15T19:12:25Z",
  "published" : "2021-07-26T21:24:09Z",
  "withdrawn" : "2021-09-15T19:12:25Z",
  "aliases" : [ "CVE-2021-23410" ],
  "summary" : "Deserialization of Untrusted Data in msgpack",
  "details" : "# Withdrawn\n\nThis advisory was withdrawn by its CNA (Snyk).\n\n## Original advisory\n\nAll versions of package `msgpack` are vulnerable to Deserialization of Untrusted Data via the unpack function. This does not affect the similarly named package `@msgpack/msgpack`.",
  "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" : "msgpack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23410"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/msgpack/msgpack-node"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/msgpack/msgpack-node/blob/master/src/msgpack.cc%23L302-L335"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-MSGPACK-1296122"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-26T17:38:45Z",
    "nvd_published_at" : "2021-07-21T17:15:00Z"
  }
}