CVE-2019-15596: Statics server Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-j27j-4w6m-8fc4
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CWE-22
Published
Advisory Summary

CVE-2019-15596 is a MODERATE path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Statics server libraries in the npm ecosystem. The issue involves path traversal in statics-server. Remediation is available in the latest vendor maintenance releases.

CVE-2019-15596 at a Glance

CVE Identifier CVE-2019-15596
GHSA Identifier GHSA-j27j-4w6m-8fc4
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Statics server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2019-15596

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

statics-server fixed: Latest secure release 
npm install statics-server@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 statics-server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2019-15596, inspect your project dependencies using npm:

npm ls statics-server

Analyze the terminal output to locate any version of Statics server 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 statics-server 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 Statics server, 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 `statics-server` are vulnerable to Path Traversal. The package fails to limit access to files outside of the served folder through symlinks. ## Recommendation No fix is currently available. Do not use `statics-server` in production or consider using an alternative module until a fix is made available.

CVE-2019-15596 Affected Statics server Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
statics-server
npm/statics-server
npm
≤ 0.0.9

References

NVD — CVE-2019-15596 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-15596
hackerone.com/reports/695416 WEB
https://hackerone.com/reports/695416
www.npmjs.com/advisories/1303 WEB
https://www.npmjs.com/advisories/1303

Frequently Asked Questions

What is CVE-2019-15596?
CVE-2019-15596 is a security vulnerability in Statics server involving Path Traversal in statics-server under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Statics server versions are affected?
Affected versions include releases prior to current release patches across affected packages: statics-server.
What version fixes CVE-2019-15596?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is statics-server affected?
Yes, statics-server is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2019-15596?
CVE-2019-15596 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 CVE-2019-15596?
Run the dependency tree command: 'npm ls statics-server'. 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-j27j-4w6m-8fc4",
  "modified" : "2020-08-31T18:54:26Z",
  "published" : "2020-03-31T17:02:12Z",
  "aliases" : [ "CVE-2019-15596" ],
  "summary" : "Path Traversal in statics-server",
  "details" : "All versions of `statics-server` are vulnerable to Path Traversal. The package fails to limit access to files outside of the served folder through symlinks.\n\n\n## Recommendation\n\nNo fix is currently available. Do not use `statics-server` in production or consider using an alternative module until a fix is made available.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "statics-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.0.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-15596"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/695416"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1303"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-03-31T15:38:57Z",
    "nvd_published_at" : null
  }
}