GHSA-5p28-63mc-cgr9: Html purify Cross-Site Scripting Vulnerability

HIGH
Share
CWE-79
Published
Advisory Summary

GHSA-5p28-63mc-cgr9 is a HIGH cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Html purify libraries in the npm ecosystem. The issue involves cross-site scripting bypass in html-purify. Remediation is available in the latest vendor maintenance releases.

GHSA-5p28-63mc-cgr9 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-5p28-63mc-cgr9
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Html purify
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-5p28-63mc-cgr9

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

html-purify fixed: Latest secure release 
npm install html-purify@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 html-purify

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-5p28-63mc-cgr9, inspect your project dependencies using npm:

npm ls html-purify

Analyze the terminal output to locate any version of Html purify 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 html-purify 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 Html purify, 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 html-purify are vulnerable to cross-site scripting. The data attribute inside of object tags is not properly sanitized and allows javascript URIs leading to code execution. No fix is currently available. Consider using an alternative package until a fix is made available.

GHSA-5p28-63mc-cgr9 Affected Html purify Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
html-purify
npm/html-purify
npm
≤ 1.1.0

References

www.npmjs.com/advisories/1586 WEB
https://www.npmjs.com/advisories/1586

Frequently Asked Questions

What is GHSA-5p28-63mc-cgr9?
GHSA-5p28-63mc-cgr9 is a security vulnerability in Html purify involving Cross-Site Scripting bypass in html-purify under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Html purify versions are affected?
Affected versions include releases prior to current release patches across affected packages: html-purify.
What version fixes GHSA-5p28-63mc-cgr9?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is html-purify affected?
Yes, html-purify is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-5p28-63mc-cgr9?
GHSA-5p28-63mc-cgr9 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 GHSA-5p28-63mc-cgr9?
Run the dependency tree command: 'npm ls html-purify'. 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-5p28-63mc-cgr9",
  "modified" : "2020-12-04T20:02:42Z",
  "published" : "2020-12-04T20:04:37Z",
  "aliases" : [ ],
  "summary" : "Cross-Site Scripting bypass in html-purify",
  "details" : "All versions of html-purify are vulnerable to cross-site scripting. The data attribute inside of object tags is not properly sanitized and allows javascript URIs leading to code execution.\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "html-purify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1586"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-12-04T20:02:42Z",
    "nvd_published_at" : null
  }
}