Vulnerabilities in pkg:npm/expressfs

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Advisory Summary

GHSA-mxmj-84q8-34r7 is a HIGH command injection vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Expressfs libraries in the npm ecosystem. The issue involves command injection in expressfs. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/expressfs

1 Known Advisory Record(s)

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

Advisory ID CVE / NVD Severity Summary
GHSA-mxmj-84q8-34r7 - HIGH Command Injection in expressfs

GHSA-mxmj-84q8-34r7 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-mxmj-84q8-34r7
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Expressfs
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-mxmj-84q8-34r7

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

expressfs fixed: Latest secure release 
npm install expressfs@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 expressfs

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-mxmj-84q8-34r7, inspect your project dependencies using npm:

npm ls expressfs

Analyze the terminal output to locate any version of Expressfs 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 expressfs 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-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. In Expressfs, 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

All versions of `expressfs` are vulnerable to Command Injection. The package does not validate user input on several API endpoints, allowing attackers to run arbitrary commands in the system. The affected endpoints are: `expressfs.appendFile`, `expressfs.cp`, `expressfs.create` and `expressfs.rmdir`. ## Recommendation No fix is currently available. Consider using an alternative module until a fix is made available.

GHSA-mxmj-84q8-34r7 Affected Expressfs Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
expressfs
npm/expressfs
npm

References

www.npmjs.com/advisories/953 WEB
https://www.npmjs.com/advisories/953

Frequently Asked Questions

What is GHSA-mxmj-84q8-34r7?
GHSA-mxmj-84q8-34r7 is a security vulnerability in Expressfs involving Command Injection in expressfs under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Expressfs versions are affected?
Affected versions include releases prior to current release patches across affected packages: expressfs.
What version fixes GHSA-mxmj-84q8-34r7?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is expressfs affected?
Yes, expressfs is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-mxmj-84q8-34r7?
GHSA-mxmj-84q8-34r7 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check npm dependencies for GHSA-mxmj-84q8-34r7?
Run the dependency tree command: 'npm ls expressfs'. 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-mxmj-84q8-34r7",
  "modified" : "2020-08-31T18:41:47Z",
  "published" : "2020-09-03T02:39:49Z",
  "aliases" : [ ],
  "summary" : "Command Injection in expressfs",
  "details" : "All versions of `expressfs` are vulnerable to Command Injection. The package does not validate user input on several API endpoints, allowing attackers to run arbitrary commands in the system. The affected endpoints are: `expressfs.appendFile`,  `expressfs.cp`, `expressfs.create` and `expressfs.rmdir`.\n\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative module until a fix is made available.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "expressfs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/953"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-31T18:41:47Z",
    "nvd_published_at" : null
  }
}