Improper Input Validation Affecting xmldom package, versions *


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.18% (57th percentile)

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  • Snyk IDSNYK-JS-XMLDOM-3092935
  • published2 Nov 2022
  • disclosed1 Nov 2022
  • creditfrumioj, karfau

Introduced: 1 Nov 2022

CVE-2022-39353  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for xmldom.

Overview

xmldom is an A pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.

Affected versions of this package are vulnerable to Improper Input Validation due to parsing XML that is not well-formed, and contains multiple top-level elements. All the root nodes are being added to the childNodes collection of the Document, without reporting or throwing any error.

Workarounds

One of the following approaches might help, depending on your use case:

  1. Instead of searching for elements in the whole DOM, only search in the documentElement.

  2. Reject a document with a document that has more than 1 childNode.

PoC

var DOMParser = require('xmldom').DOMParser;
var xmlData = '<?xml version="1.0" encoding="UTF-8"?>\n' +
'<root>\n' +
'  <branch girth="large">\n' +
'    <leaf color="green" />\n' +
'  </branch>\n' +
'</root>\n' +
'<root>\n' +
'  <branch girth="twig">\n' +
'    <leaf color="gold" />\n' +
'  </branch>\n' +
'</root>\n';
var xmlDOM = new DOMParser().parseFromString(xmlData);
console.log(xmlDOM.toString());

This will result with the following output:

<?xml version="1.0" encoding="UTF-8"?><root>
  <branch girth="large">
    <leaf color="green"/>
  </branch>
</root>
<root>
  <branch girth="twig">
    <leaf color="gold"/>
  </branch>
</root>

CVSS Scores

version 3.1