CVE-2018-3773: Metascraper Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-8f64-q7jc-ccgp
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2018-3773 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Metascraper libraries in the npm ecosystem. The issue involves metascraper before v5.2.0 vulnerable to stored cross-site scripting. Remediation is available by upgrading affected packages to version 5.2.0.

CVE-2018-3773 at a Glance

CVE Identifier CVE-2018-3773
GHSA Identifier GHSA-8f64-q7jc-ccgp
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Metascraper
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2018-3773

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

metascraper fixed: 5.2.0 
npm install metascraper@5.2.0
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 metascraper

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2018-3773, inspect your project dependencies using npm:

npm ls metascraper

Analyze the terminal output to locate any version of Metascraper in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.2.0), your application is affected.

Note: The npm ls metascraper 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Metascraper, 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 `metascraper` prior to 5.2.0 are vulnerable to stored cross-site scripting (XSS). ## Recommendation Upgrade to version 5.2.0 or later.

CVE-2018-3773 Affected Metascraper Versions

1 component(s)
Fixed Versions:
5.2.0
Product / Package Ecosystem Affected Versions Fixed Version
metascraper
npm/metascraper
npm
< 5.2.0
5.2.0

References

NVD — CVE-2018-3773 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-3773
Metascraper Source Repository REPOSITORY
https://github.com/microlinkhq/metascraper/pull/169
hackerone.com/reports/309367 WEB
https://hackerone.com/reports/309367
Metascraper Source Repository REPOSITORY
https://github.com/microlinkhq/metascraper
www.npmjs.com/advisories/603 WEB
https://www.npmjs.com/advisories/603

Frequently Asked Questions

What is CVE-2018-3773?
CVE-2018-3773 is a security vulnerability in Metascraper involving metascraper before v5.2.0 vulnerable to stored cross-site scripting under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Metascraper versions are affected?
Affected versions include releases prior to 5.2.0 across affected packages: metascraper.
What version fixes CVE-2018-3773?
Upgrading to 5.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is metascraper affected?
Yes, metascraper is affected in releases prior to 5.2.0. Upgrade your dependency to 5.2.0 or later.
What is the CVSS score of CVE-2018-3773?
CVE-2018-3773 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2018-3773?
CVE-2018-3773 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2018-3773?
Run the dependency tree command: 'npm ls metascraper'. 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-8f64-q7jc-ccgp",
  "modified" : "2023-01-31T01:53:19Z",
  "published" : "2018-08-08T22:25:57Z",
  "aliases" : [ "CVE-2018-3773" ],
  "summary" : "metascraper before v5.2.0 vulnerable to stored cross-site scripting",
  "details" : "Versions of `metascraper` prior to 5.2.0 are vulnerable to stored cross-site scripting (XSS).\n\n\n## Recommendation\n\nUpgrade to version 5.2.0 or later.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "metascraper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-3773"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microlinkhq/metascraper/pull/169"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/309367"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/microlinkhq/metascraper"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/603"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:25:23Z",
    "nvd_published_at" : "2018-07-30T18:29:00Z"
  }
}