CVE-2021-42360 Information

Description

On sites that also had the Elementor plugin for WordPress installed it was possible for users with the edit_posts capability which includes Contributor-level users to import blocks onto any page using the astra-page-elementor-batch-process AJAX action. An attacker could craft and host a block containing malicious JavaScript on a server they controlled and then use it to overwrite any post or page by sending an AJAX request with the action set to astra-page-elementor-batch-process and the url parameter pointed to their remotely-hosted malicious block as well as an id parameter containing the post or page to overwrite. Any post or page that had been built with Elementor including published pages could be overwritten by the imported block and the malicious JavaScript in the imported block would then be executed in the browser of any visitors to that page.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Reference

https://www.wordfence.com/blog/2021/11/over-1-million-sites-impacted-by-vulnerability-in-starter-templates-plugin/ On sites that also had the Elementor plugin for WordPress installed it was possible for users with the edit_posts capability which includes Contributor-level users to import blocks onto any page using the astra-page-elementor-batch-process AJAX action. An attacker could craft and host a block containing malicious JavaScript on a server they controlled and then use it to overwrite any post or page by sending an AJAX request with the action set to astra-page-elementor-batch-process and the url parameter pointed to their remotely-hosted malicious block as well as an id parameter containing the post or page to overwrite. Any post or page that had been built with Elementor including published pages could be overwritten by the imported block and the malicious JavaScript in the imported block would then be executed in the browser of any visitors to that page.

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

5.4