GHSA-w4vp-3mq7-7v82: Lazysizes Cross-Site Scripting Vulnerability

HIGH
Share
CWE-79
Published
Advisory Summary

GHSA-w4vp-3mq7-7v82 is a HIGH cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Lazysizes libraries in the npm ecosystem. The issue involves cross-site scripting in lazysizes. Remediation is available by upgrading affected packages to version 5.2.1-rc1.

GHSA-w4vp-3mq7-7v82 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-w4vp-3mq7-7v82
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 Lazysizes
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-w4vp-3mq7-7v82

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

lazysizes fixed: 5.2.1-rc1 
npm install lazysizes@5.2.1-rc1
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 lazysizes

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-w4vp-3mq7-7v82, inspect your project dependencies using npm:

npm ls lazysizes

Analyze the terminal output to locate any version of Lazysizes in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.2.1-rc1), your application is affected.

Note: The npm ls lazysizes 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 Lazysizes, 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 `lazysizes` prior to 5.2.1-rc1 are vulnerable to Cross-Site Scripting. The `video-embed` plugin fails to sanitize the following attributes: data-vimeo, `data-vimeoparams`, `data-youtube` and `data-ytparams`. This allows attackers to execute arbitrary JavaScript in a victim's browser if the attacker has control over the vulnerable attributes. ## Recommendation Upgrade to version 5.2.1-rc1 or later.

GHSA-w4vp-3mq7-7v82 Affected Lazysizes Versions

1 component(s)
Fixed Versions:
5.2.1-rc1
Product / Package Ecosystem Affected Versions Fixed Version
lazysizes
npm/lazysizes
npm
< 5.2.1-rc1
5.2.1-rc1

References

Lazysizes Source Repository REPOSITORY
https://github.com/aFarkas/lazysizes/issues/764
www.npmjs.com/advisories/1493 WEB
https://www.npmjs.com/advisories/1493

Frequently Asked Questions

What is GHSA-w4vp-3mq7-7v82?
GHSA-w4vp-3mq7-7v82 is a security vulnerability in Lazysizes involving Cross-Site Scripting in lazysizes under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Lazysizes versions are affected?
Affected versions include releases prior to 5.2.1-rc1 across affected packages: lazysizes.
What version fixes GHSA-w4vp-3mq7-7v82?
Upgrading to 5.2.1-rc1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is lazysizes affected?
Yes, lazysizes is affected in releases prior to 5.2.1-rc1. Upgrade your dependency to 5.2.1-rc1 or later.
What CWE is associated with GHSA-w4vp-3mq7-7v82?
GHSA-w4vp-3mq7-7v82 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-w4vp-3mq7-7v82?
Run the dependency tree command: 'npm ls lazysizes'. 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-w4vp-3mq7-7v82",
  "modified" : "2020-08-31T19:01:17Z",
  "published" : "2020-09-03T15:49:48Z",
  "aliases" : [ ],
  "summary" : "Cross-Site Scripting in lazysizes",
  "details" : "Versions of `lazysizes` prior to 5.2.1-rc1 are vulnerable to Cross-Site Scripting.  The `video-embed` plugin fails to sanitize the following attributes: data-vimeo, `data-vimeoparams`, `data-youtube` and `data-ytparams`. This allows attackers to execute arbitrary JavaScript in a victim's browser if the attacker has control over the vulnerable attributes.\n\n\n## Recommendation\n\nUpgrade to version 5.2.1-rc1 or later.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "lazysizes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.2.1-rc1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.2.1-rc0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/aFarkas/lazysizes/issues/764"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1493"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-31T19:01:17Z",
    "nvd_published_at" : null
  }
}