Overview
Prototype pollution vulnerability in 'dset' versions 1.0.0 through 2.0.1 allows attacker to cause a denial of service and may lead to remote code execution.
Details
The NPM module 'dset' can be abused by Prototype Pollution vulnerability since the function ‘export ()' did not check for the type of object before assigning value to the property. Due to this flaw an attacker could create a non-existent property or able to manipulate the property which leads to Denial of Service or potentially Remote code execution.
PoC
The export function accepts three arguments obj, keys, val. Due to the absence of validation, at values passed into keys, val arguments, an attacker can supply a malicious value by adjusting the keys value to include the __proto__ property. Since there is no validation before assigning property to check whether the assigned keys is the Object's own property or not, the property isAdmin will be directly be assigned to the empty obj({}) thereby polluting the Object prototype. Later in the code, if there is a check to validate isAdmin the valued would be substituted as "true" as it had been polluted.
const dset = require('dset');
var obj = {}
console.log("Before : " + obj.isAdmin);
dset(obj, '__proto__.polluted', true);
console.log("After : " + obj.polluted);References
Overview
Prototype pollution vulnerability in 'dset' versions 1.0.0 through 2.0.1 allows attacker to cause a denial of service and may lead to remote code execution.
Details
The NPM module 'dset' can be abused by Prototype Pollution vulnerability since the function ‘export ()' did not check for the type of object before assigning value to the property. Due to this flaw an attacker could create a non-existent property or able to manipulate the property which leads to Denial of Service or potentially Remote code execution.
PoC
The export function accepts three arguments
obj, keys, val. Due to the absence of validation, at values passed intokeys, valarguments, an attacker can supply a malicious value by adjusting thekeysvalue to include the__proto__property. Since there is no validation before assigning property to check whether the assignedkeysis the Object's own property or not, the propertyisAdminwill be directly be assigned to the empty obj({}) thereby polluting the Object prototype. Later in the code, if there is a check to validateisAdminthe valued would be substituted as "true" as it had been polluted.References