CVE-2021-25094 Information

Description

The Tatsu WordPress plugin before 3.3.12 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress’s upload directory. By adding a PHP shell with a filename starting with a dot .\ this can bypass extension control implemented in the plugin. Moreover there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://wpscan.com/vulnerability/fb0097a0-5d7b-4e5b-97de-aacafa8fffcd https://darkpills.com/wordpress-tatsu-builder-preauth-rce-cve-2021-25094/ http://packetstormsecurity.com/files/167190/WordPress-Tatsu-Builder-Remote-Code-Execution.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1