Headline
CVE-2022-21144: Denial of Service (DoS) in libxmljs | CVE-2022-21144 | Snyk
This affects all versions of package libxmljs. When invoking the libxmljs.parseXml function with a non-buffer argument the V8 code will attempt invoking the .toString method of the argument. If the argument’s toString value is not a Function object V8 will crash.
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snyk-id
SNYK-JS-LIBXMLJS-2348756
published
6 Apr 2022
disclosed
20 Jan 2022
credit
Cristian-Alexandru Staicu, Aviad Hahami
How to fix?
A fix was pushed into the master branch but not yet published.
Overview
libxmljs is a libxml bindings for v8 javascript engine
Affected versions of this package are vulnerable to Denial of Service (DoS). When invoking the libxmljs.parseXml function with a non-buffer argument the V8 code will attempt invoking the .toString method of the argument. If the argument’s toString value is not a Function object V8 will crash.
PoC:
let libxmljs = require("libxmljs");
let xml = {toString: 1 };
libxmljs.parseXml(xml);
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package
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