CVE-2018-3733: Crud file server Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-vfp9-gwrh-wq9g
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2018-3733 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Crud file server libraries in the npm ecosystem. The issue involves path traversal in crud-file-server. Remediation is available by upgrading affected packages to version 0.9.0.

CVE-2018-3733 at a Glance

CVE Identifier CVE-2018-3733
GHSA Identifier GHSA-vfp9-gwrh-wq9g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Crud file server
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2018-3733

To remediate this vulnerability, upgrade all affected Crud file 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.

crud-file-server fixed: 0.9.0 
npm install crud-file-server@0.9.0
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 crud-file-server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2018-3733, inspect your project dependencies using npm:

npm ls crud-file-server

Analyze the terminal output to locate any version of Crud file server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.0), your application is affected.

Note: The npm ls crud-file-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 Crud file 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

Versions of `crud-file-server` prior to 0.9.0 are vulnerable to Path Traversal. The package fails to sanitize URLs, allowing attackers to access server files outside of the served folder using relative paths. ## Recommendation Upgrade to version 0.9.0 or later.

CVE-2018-3733 Affected Crud file server Versions

1 component(s)
Fixed Versions:
0.9.0
Product / Package Ecosystem Affected Versions Fixed Version
crud-file-server
npm/crud-file-server
npm
< 0.9.0
0.9.0

References

NVD — CVE-2018-3733 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-3733
Security Fix Commit FIX COMMIT
https://github.com/omphalos/crud-file-server/commit/4fc3b404f718abb789f4ce4272c39c7a138c7a82
hackerone.com/reports/310690 WEB
https://hackerone.com/reports/310690
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-vfp9-gwrh-wq9g
www.npmjs.com/advisories/1003 WEB
https://www.npmjs.com/advisories/1003

Frequently Asked Questions

What is CVE-2018-3733?
CVE-2018-3733 is a security vulnerability in Crud file server involving Path Traversal in crud-file-server under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Crud file server versions are affected?
Affected versions include releases prior to 0.9.0 across affected packages: crud-file-server.
What version fixes CVE-2018-3733?
Upgrading to 0.9.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is crud-file-server affected?
Yes, crud-file-server is affected in releases prior to 0.9.0. Upgrade your dependency to 0.9.0 or later.
What is the CVSS score of CVE-2018-3733?
CVE-2018-3733 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-3733?
CVE-2018-3733 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-2018-3733?
Run the dependency tree command: 'npm ls crud-file-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-vfp9-gwrh-wq9g",
  "modified" : "2023-03-01T01:14:15Z",
  "published" : "2018-07-18T21:20:19Z",
  "aliases" : [ "CVE-2018-3733" ],
  "summary" : "Path Traversal in crud-file-server",
  "details" : "Versions of `crud-file-server` prior to 0.9.0 are vulnerable to Path Traversal. The package fails to sanitize URLs, allowing attackers to access server files outside of the served folder using relative paths.\n\n\n## Recommendation\n\nUpgrade to version 0.9.0 or later.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "crud-file-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-3733"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/omphalos/crud-file-server/commit/4fc3b404f718abb789f4ce4272c39c7a138c7a82"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/310690"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-vfp9-gwrh-wq9g"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1003"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:57:36Z",
    "nvd_published_at" : "2018-05-29T20:29:00Z"
  }
}