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undefsafe@1.2.0 vulnerabilities

Undefined safe way of extracting object properties

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Direct Vulnerabilities

Known vulnerabilities in the undefsafe package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
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Prototype Pollution

undefsafe is a Simple function for retrieving deep object properties without getting "Cannot read property 'X' of undefined".

Affected versions of this package are vulnerable to Prototype Pollution. The a function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.

PoC by JHU System Security Lab

var a = require("undefsafe");
var payload = "__proto__.toString";
a({},payload,"JHU");
console.log({}.toString);

How to fix Prototype Pollution?

Upgrade undefsafe to version 2.0.3 or higher.

<2.0.3
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