Validation Bypass Affecting kind-of package, versions >=6.0.0 <6.0.3
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.09% (40th
percentile)
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Test your applications- Snyk ID SNYK-JS-KINDOF-537849
- published 19 Jan 2020
- disclosed 16 Dec 2019
- credit Feng Xiao
Introduced: 16 Dec 2019
CVE-2019-20149 Open this link in a new tabHow to fix?
Upgrade kind-of to version 6.0.3 or higher.
Overview
kind-of is a package that gets the native type of a value.
Affected versions of this package are vulnerable to Validation Bypass. It leverages the built-in constructor of unsafe user-input to detect type information. However, a crafted payload can overwrite this built in attribute to manipulate the type detection result.
PoC by Feng Xiao
var kindOf = require('kind-of');
var user_input = {
user: 'barney',
age: 36,
active: true,
"constructor":{"name":"Symbol"}
};
console.log(kindOf(user_input));
References
CVSS Scores
version 3.1