CVE-2020-11887: Svg2png Cross-Site Scripting Vulnerability

MODERATE

Advisory Identifier: GHSA-mpp5-2x55-49xw

CVSS 6.1

Published 2022-01-06

Advisory Summary

CVE-2020-11887 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Svg2png libraries in the npm ecosystem. The issue involves xss in svg2png (npm package). Remediation is available in the latest vendor maintenance releases.

CVE-2020-11887 at a Glance

CVE Identifier CVE-2020-11887

GHSA Identifier GHSA-mpp5-2x55-49xw

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 Svg2png

Package Ecosystem npm

Published Date 2022-01-06

Last Updated 2021-05-25

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-2020-11887

To remediate this vulnerability, upgrade all affected Svg2png dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

svg2png fixed: Latest secure release

npm install svg2png@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 svg2png

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-11887, inspect your project dependencies using npm:

npm ls svg2png

Analyze the terminal output to locate any version of Svg2png 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 svg2png 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 Svg2png, 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

svg2png 4.1.1 allows XSS with resultant SSRF via JavaScript inside an SVG document.

CVE-2020-11887 Affected Svg2png Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
svg2png npm/svg2png	npm	≤ 4.1.1

References

NVD — CVE-2020-11887 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-11887

Svg2png Source Repository REPOSITORY

https://github.com/domenic/svg2png/issues/117

Frequently Asked Questions

What is CVE-2020-11887?

CVE-2020-11887 is a security vulnerability in Svg2png involving XSS in svg2png (NPM package) under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Which Svg2png versions are affected?

Affected versions include releases prior to current release patches across affected packages: svg2png.

What version fixes CVE-2020-11887?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is svg2png affected?

Yes, svg2png is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2020-11887?

CVE-2020-11887 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-2020-11887?

CVE-2020-11887 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-2020-11887?

Run the dependency tree command: 'npm ls svg2png'. 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-mpp5-2x55-49xw",
  "modified" : "2021-05-25T19:52:21Z",
  "published" : "2022-01-06T19:45:13Z",
  "aliases" : [ "CVE-2020-11887" ],
  "summary" : "XSS in svg2png (NPM package)",
  "details" : "svg2png 4.1.1 allows XSS with resultant SSRF via JavaScript inside an SVG document.",
  "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" : "svg2png"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "4.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-11887"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/domenic/svg2png/issues/117"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T19:52:21Z",
    "nvd_published_at" : "2020-04-17T21:15:00Z"
  }
}

CVSS V3

6.1 MODERATE