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CVE-2020-28276
Date: December 29, 2020
Overview
Prototype pollution vulnerability in 'deep-set' versions 1.0.0 through 1.0.1 allows attacker to cause a denial of service and may lead to remote code execution.Details
The NPM module 'deep-set' can be abused by Prototype Pollution vulnerability since the function 'deepSet()' does 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
Since there is no validation before assigning the property to check whether the assigned argument 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
var deepSet = require('deep-set')
var obj = {'1':'2'} console.log(obj.isAdmin);
deepSet(obj, '__proto__.isAdmin', 'true');
console.log(obj.isAdmin);Affected Environments
0.7.0-4.0.0Remediation
There are a couple of ways to mitigate prototype pollution vulnerabilities, for example: Most of the cases can be solved by freezing an object which doesn’t allow to add, remove, or change its properties. Validating the JSON input with shcema validation, this guarantees that the JSON input contains only predefined attributes. We can change the objects, so they won’t have any prototype association by using “Object.create”.Prevention
No fix versionLanguage: JS
Good to know:
Insufficient Information
NVD-CWE-noinfoImproperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-1321
Upgrade Version
No fix version available
| Base Score: |
|
|---|---|
| Attack Vector (AV): | Network |
| Attack Complexity (AC): | Low |
| Privileges Required (PR): | None |
| User Interaction (UI): | None |
| Scope (S): | Unchanged |
| Confidentiality (C): | High |
| Integrity (I): | High |
| Availability (A): | High |
| Base Score: |
|
|---|---|
| Access Vector (AV): | Network |
| Access Complexity (AC): | Low |
| Authentication (AU): | None |
| Confidentiality (C): | Partial |
| Integrity (I): | Partial |
| Availability (A): | Partial |
| Additional information: |