CVE-2020-27428: Scratch svg renderer Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-h3vq-wv8j-36gw
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CWE-79
Published
Advisory Summary

CVE-2020-27428 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Scratch svg renderer libraries in the npm ecosystem. The issue involves cross-site scripting in scratch-svg-renderer. Remediation is available in the latest vendor maintenance releases.

CVE-2020-27428 at a Glance

CVE Identifier CVE-2020-27428
GHSA Identifier GHSA-h3vq-wv8j-36gw
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Scratch svg renderer
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2020-27428

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

scratch-svg-renderer fixed: Latest secure release 
npm install scratch-svg-renderer@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 scratch-svg-renderer

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-27428, inspect your project dependencies using npm:

npm ls scratch-svg-renderer

Analyze the terminal output to locate any version of Scratch svg renderer 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 scratch-svg-renderer 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 Scratch svg renderer, 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

A DOM-based cross-site scripting (XSS) vulnerability in Scratch-Svg-Renderer v0.2.0 allows attackers to execute arbitrary web scripts or HTML via a crafted sb3 file.

CVE-2020-27428 Affected Scratch svg renderer Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
scratch-svg-renderer
npm/scratch-svg-renderer
npm
≤ 0.2.0

References

NVD — CVE-2020-27428 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27428
Security Fix Commit FIX COMMIT
https://github.com/LLK/scratch-svg-renderer/commit/7c74ec7de3254143ec3c557677f5355a90a3d07f
Scratch svg renderer Source Repository REPOSITORY
https://github.com/LLK/scratch-svg-renderer

Frequently Asked Questions

What is CVE-2020-27428?
CVE-2020-27428 is a security vulnerability in Scratch svg renderer involving Cross-site Scripting in Scratch-Svg-Renderer under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Scratch svg renderer versions are affected?
Affected versions include releases prior to current release patches across affected packages: scratch-svg-renderer.
What version fixes CVE-2020-27428?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is scratch-svg-renderer affected?
Yes, scratch-svg-renderer is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2020-27428?
CVE-2020-27428 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-2020-27428?
Run the dependency tree command: 'npm ls scratch-svg-renderer'. 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-h3vq-wv8j-36gw",
  "modified" : "2022-01-07T23:45:14Z",
  "published" : "2022-01-08T00:44:33Z",
  "aliases" : [ "CVE-2020-27428" ],
  "summary" : "Cross-site Scripting in Scratch-Svg-Renderer",
  "details" : "A DOM-based cross-site scripting (XSS) vulnerability in Scratch-Svg-Renderer v0.2.0 allows attackers to execute arbitrary web scripts or HTML via a crafted sb3 file.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "scratch-svg-renderer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27428"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/LLK/scratch-svg-renderer/commit/7c74ec7de3254143ec3c557677f5355a90a3d07f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/LLK/scratch-svg-renderer"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-07T23:45:14Z",
    "nvd_published_at" : "2022-01-06T00:15:00Z"
  }
}