CVE-2020-7640: Pixl class OS Command Injection Vulnerability

HIGH
Advisory Identifier: GHSA-vm5j-vqr6-v7v8
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CVSS 9.8
CWE-78
Published
Advisory Summary

CVE-2020-7640 is a HIGH (CVSS 9.8) os command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Pixl class libraries in the npm ecosystem. The issue involves os command injection in pixl-class. Remediation is available by upgrading affected packages to version 1.0.3.

CVE-2020-7640 at a Glance

CVE Identifier CVE-2020-7640
GHSA Identifier GHSA-vm5j-vqr6-v7v8
Severity HIGH
CVSS v3.1 Base Score 9.8
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Pixl class
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-2020-7640

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

pixl-class fixed: 1.0.3 
npm install pixl-class@1.0.3
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 pixl-class

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7640, inspect your project dependencies using npm:

npm ls pixl-class

Analyze the terminal output to locate any version of Pixl class in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.3), your application is affected.

Note: The npm ls pixl-class 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Pixl class, 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

pixl-class prior to 1.0.3 allows execution of arbitrary commands. The members argument of the create function can be controlled by users without any sanitization.

CVE-2020-7640 Affected Pixl class Versions

1 component(s)
Fixed Versions:
1.0.3
Product / Package Ecosystem Affected Versions Fixed Version
pixl-class
npm/pixl-class
npm
< 1.0.3
1.0.3

References

NVD — CVE-2020-7640 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7640
Security Fix Commit FIX COMMIT
https://github.com/jhuckaby/pixl-class/commit/47677a3638e3583e42f3a05cc7f0b30293d2acc8
Security Fix Commit FIX COMMIT
https://github.com/jhuckaby/pixl-class/commit/47677a3638e3583e42f3a05cc7f0b30293d2acc8,
snyk.io/vuln/snyk-js-pixlcl... WEB
https://snyk.io/vuln/SNYK-JS-PIXLCLASS-564968

Frequently Asked Questions

What is CVE-2020-7640?
CVE-2020-7640 is a security vulnerability in Pixl class involving OS Command Injection in pixl-class under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Pixl class versions are affected?
Affected versions include releases prior to 1.0.3 across affected packages: pixl-class.
What version fixes CVE-2020-7640?
Upgrading to 1.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pixl-class affected?
Yes, pixl-class is affected in releases prior to 1.0.3. Upgrade your dependency to 1.0.3 or later.
What is the CVSS score of CVE-2020-7640?
CVE-2020-7640 has a CVSS v3.1 base score of 9.8 (HIGH) 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-2020-7640?
CVE-2020-7640 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check npm dependencies for CVE-2020-7640?
Run the dependency tree command: 'npm ls pixl-class'. 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-vm5j-vqr6-v7v8",
  "modified" : "2021-05-25T20:40:19Z",
  "published" : "2021-12-10T20:04:56Z",
  "aliases" : [ "CVE-2020-7640" ],
  "summary" : "OS Command Injection in pixl-class",
  "details" : "pixl-class prior to 1.0.3 allows execution of arbitrary commands. The members argument of the create function can be controlled by users without any sanitization.",
  "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" : "pixl-class"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7640"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhuckaby/pixl-class/commit/47677a3638e3583e42f3a05cc7f0b30293d2acc8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jhuckaby/pixl-class/commit/47677a3638e3583e42f3a05cc7f0b30293d2acc8,"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-PIXLCLASS-564968"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T20:40:19Z",
    "nvd_published_at" : "2020-04-27T22:15:00Z"
  }
}