Zero-day vulnerability in

Improper access control

The vulnerability was used in the wild to compromise websites with vulnerable plugin. The attackers downloaded Woo-Add-To-Carts plugin on the system and created administrative accounts.

Vulnerability details

Advisory: SB2020022609 - Improper access control in Flexible Checkout Fields for WooCommerce plugin for WordPress

Vulnerable component:

CVE-ID:

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-284 - Improper Access Control

Description:

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote attacker can bypass implemented security restrictions and inject new fields and scripts into the WooCommerce checkout page.

Note: the vulnerability is being actively exploited in the wild.

External links:

https://wordpress.org/support/topic/malicious-access-plugin-woo-add-to-carts-by-linkflowusers/

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.