icon

We found results for “

CVE-2020-28267

Date: November 10, 2020

Overview

Prototype pollution vulnerability in '@strikeentco/set' version 1.0.0 allows attacker to cause a denial of service and may lead to remote code execution.

Details

'@strikeentco/set' can be abused by Prototype Pollution vulnerability since the module 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 Details

The module accepts four arguments `obj, parts, length, val`. Due to the absence of validation, at values passed into `parts, length` arguments, an attacker can supply a malicious value by adjusting the `parts` value to include the `__proto__` property. Since there is no validation before assigning property to check whether the assigned `parts` 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.

PoC Code

const sset = require('@strikeentco/set');
var obj = {}
console.log("Before : " + obj.isAdmin);
sset(obj, '__proto__.isAdmin', true);
console.log("After : " + obj.isAdmin);

Affected Environments

1.0.0

Prevention

Upgrade to version 1.0.1

Language: JS

Good to know:

icon
icon

Insufficient Information

NVD-CWE-noinfo
icon

Upgrade Version

Upgrade to version 1.0.1

Learn More

Base Score:
Attack Vector (AV): Network
Attack Complexity (AC): Low
Privilegs Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High
Base Score:
Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional information: