Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS04bXA4LTI4eGgtcjQ4Ns4AAmv-

keyget vulnerable to prototype pollution

Overview

Prototype pollution vulnerability in 'keyget' versions 1.0.0 through 2.2.0 allows attacker to cause a denial of service and may lead to remote code execution.

Details

The npm module 'keyget' can be abused by Prototype Pollution vulnerability since the function 'setByPath()' 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 setByPath() function accepts three arguments target, path, value. Due to the absence of validation, at values passed into path, value an attacker can supply a malicious value by adjusting the path value to include the __proto__ property. Since there is no validation before assigning property to check whether the assigned path is the Object's own property or not, the property polluted 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 polluted the value would be substituted as "true" as it had been polluted.

PoC Code

var keyget = require("keyget")
 keyget.set({}, '__proto__.polluted', 'true');
 console.log(polluted); 

Permalink: https://github.com/advisories/GHSA-8mp8-28xh-r486
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS04bXA4LTI4eGgtcjQ4Ns4AAmv-
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 2 years ago
Updated: about 1 year ago

CVSS Score: 9.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Percentage: 0.01198
EPSS Percentile: 0.84887

Identifiers: GHSA-8mp8-28xh-r486, CVE-2020-28272
References:

• https://nvd.nist.gov/vuln/detail/CVE-2020-28272
• https://github.com/rumkin/keyget/commit/17d15b6c75036eb429075a8cfeccfc18094dd2e2
• https://web.archive.org/web/20201207183211/https://www.whitesourcesoftware.com/vulnerability-database/CVE-2020-28272
• https://github.com/advisories/GHSA-8mp8-28xh-r486

Repository: https://github.com/rumkin/keyget
Blast Radius: 0.0

Affected Packages