Vulnerabilities in pkg:npm/netmask

PACKAGE
Advisory Identifier: GHSA-pch5-whg9-qr2r
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Advisory Summary

CVE-2021-29418 is a MODERATE (CVSS 5.3) netmask npm package mishandles octal vulnerability (CWE-20: Improper Input Validation) affecting Netmask libraries in the npm ecosystem. The issue involves netmask npm package mishandles octal input data. Remediation is available by upgrading affected packages to version 2.0.1.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/netmask

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/netmask. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-pch5-whg9-qr2r CVE-2021-29418 MODERATE netmask npm package mishandles octal input data
GHSA-4c7m-wxvm-r7gc CVE-2021-28918 CRITICAL Improper parsing of octal bytes in netmask

CVE-2021-29418 at a Glance

CVE Identifier CVE-2021-29418
GHSA Identifier GHSA-pch5-whg9-qr2r
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-20: Improper Input Validation
Affected Product Netmask
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:N/I:L/A:N).

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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-29418

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

netmask fixed: 2.0.1 
npm install netmask@2.0.1
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 netmask

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-29418, inspect your project dependencies using npm:

npm ls netmask

Analyze the terminal output to locate any version of Netmask in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.1), your application is affected.

Note: The npm ls netmask 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Netmask, 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

The netmask package before 2.0.1 for Node.js mishandles certain unexpected characters in an IP address string, such as an octal digit of 9. This (in some situations) allows attackers to bypass access control that is based on IP addresses. NOTE: this issue exists because of an incomplete fix for CVE-2021-28918.

CVE-2021-29418 Affected Netmask Versions

1 component(s)
Fixed Versions:
2.0.1
Product / Package Ecosystem Affected Versions Fixed Version
netmask
npm/netmask
npm
< 2.0.1
2.0.1

References

sick.codes/universal-netmask-n... WEB
https://sick.codes/universal-netmask-npm-package-used-by-270000-projects-vulnerable-to-octal-input-data-server-side-request-forgery-remote-file-inclusion-local-file-inclusion-and-more-cve-2021-28918
vuln.ryotak.me/advisories/6 WEB
https://vuln.ryotak.me/advisories/6
www.npmjs.com/package/netmask WEB
https://www.npmjs.com/package/netmask
NVD — CVE-2021-29418 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29418
Security Fix Commit FIX COMMIT
https://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4
Netmask Security Information SECURITY
https://security.netapp.com/advisory/ntap-20210604-0001
sick.codes/sick-2021-011 WEB
https://sick.codes/sick-2021-011

Frequently Asked Questions

What is CVE-2021-29418?
CVE-2021-29418 is a security vulnerability in Netmask involving netmask npm package mishandles octal input data under CWE-20: Improper Input Validation.
Which Netmask versions are affected?
Affected versions include releases prior to 2.0.1 across affected packages: netmask.
What version fixes CVE-2021-29418?
Upgrading to 2.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is netmask affected?
Yes, netmask is affected in releases prior to 2.0.1. Upgrade your dependency to 2.0.1 or later.
What is the CVSS score of CVE-2021-29418?
CVE-2021-29418 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-29418?
CVE-2021-29418 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check npm dependencies for CVE-2021-29418?
Run the dependency tree command: 'npm ls netmask'. 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-pch5-whg9-qr2r",
  "modified" : "2023-09-08T20:25:35Z",
  "published" : "2021-03-29T21:32:05Z",
  "aliases" : [ "CVE-2021-29418" ],
  "summary" : "netmask npm package mishandles octal input data",
  "details" : "The netmask package before 2.0.1 for Node.js mishandles certain unexpected characters in an IP address string, such as an octal digit of 9. This (in some situations) allows attackers to bypass access control that is based on IP addresses. NOTE: this issue exists because of an incomplete fix for CVE-2021-28918.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "netmask"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29418"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20210604-0001"
  }, {
    "type" : "WEB",
    "url" : "https://sick.codes/sick-2021-011"
  }, {
    "type" : "WEB",
    "url" : "https://sick.codes/universal-netmask-npm-package-used-by-270000-projects-vulnerable-to-octal-input-data-server-side-request-forgery-remote-file-inclusion-local-file-inclusion-and-more-cve-2021-28918"
  }, {
    "type" : "WEB",
    "url" : "https://vuln.ryotak.me/advisories/6"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/netmask"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-29T21:31:24Z",
    "nvd_published_at" : "2021-03-30T07:15:00Z"
  }
}