GHSA-73cw-jxmm-qpgh: Localhost now Path Traversal Vulnerability

HIGH
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CWE-22
Published
Advisory Summary

GHSA-73cw-jxmm-qpgh is a HIGH path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Localhost now libraries in the npm ecosystem. The issue involves path traversal in localhost-now. Remediation is available in the latest vendor maintenance releases.

GHSA-73cw-jxmm-qpgh at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-73cw-jxmm-qpgh
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Localhost now
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-73cw-jxmm-qpgh

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

localhost-now fixed: Latest secure release 
npm install localhost-now@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 localhost-now

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-73cw-jxmm-qpgh, inspect your project dependencies using npm:

npm ls localhost-now

Analyze the terminal output to locate any version of Localhost now 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 localhost-now 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Localhost now, 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 `localhost-now` are vulnerable to path traversal. This vulnerability is a bypass to the path traversal fix introduced in version 1.0.2 Proof of concept: ``` $ curl -v --path-as-is "http://IP:5432/..././..././..././..././..././..././..././..././..././..././etc/passwd" ``` ## Recommendation No fix is currently available for this vulnerability. It is our recommendation to not install or use this module until a fix is available.

GHSA-73cw-jxmm-qpgh Affected Localhost now Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
localhost-now
npm/localhost-now
npm
≤ 1.0.2

References

hackerone.com/reports/329837 WEB
https://hackerone.com/reports/329837
Localhost now Source Repository REPOSITORY
https://github.com/DCKT/localhost-now/blob/master/lib/app.js#L17
www.npmjs.com/advisories/655 WEB
https://www.npmjs.com/advisories/655

Frequently Asked Questions

What is GHSA-73cw-jxmm-qpgh?
GHSA-73cw-jxmm-qpgh is a security vulnerability in Localhost now involving Path Traversal in localhost-now under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Localhost now versions are affected?
Affected versions include releases prior to current release patches across affected packages: localhost-now.
What version fixes GHSA-73cw-jxmm-qpgh?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is localhost-now affected?
Yes, localhost-now is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-73cw-jxmm-qpgh?
GHSA-73cw-jxmm-qpgh is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check npm dependencies for GHSA-73cw-jxmm-qpgh?
Run the dependency tree command: 'npm ls localhost-now'. 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-73cw-jxmm-qpgh",
  "modified" : "2020-08-31T18:31:31Z",
  "published" : "2019-06-11T16:40:48Z",
  "aliases" : [ ],
  "summary" : "Path Traversal in localhost-now",
  "details" : "All versions of `localhost-now` are vulnerable to path traversal. This vulnerability is a bypass to the path traversal fix introduced in version 1.0.2\n\nProof of concept:\n\n```\n$ curl -v --path-as-is \"http://IP:5432/..././..././..././..././..././..././..././..././..././..././etc/passwd\" \n```\n\n\n## Recommendation\n\nNo fix is currently available for this vulnerability. It is our recommendation to not install or use this module until a fix is available.\n ",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "localhost-now"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/329837"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/DCKT/localhost-now/blob/master/lib/app.js#L17"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/655"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-06-11T16:40:34Z",
    "nvd_published_at" : null
  }
}