Cross Site Scripting (XSS) and Remote Code Execution (RCE)

Low

baserproject published GHSA-673x-f5wx-fxpw

Aug 27, 2020

Package

ThemeFilesController.php、UploaderFilesController.php

Affected versions

< 4.3.6

Patched versions

4.3.7

Description

baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE).

Impact: XSS to RCE via Arbitrary file upload.
Attack vector is: Administrator must be logged in.
Components are: ThemeFilesController.php, UploaderFilesController.php.
Tested baserCMS Version : 4.3.6 (Latest)
Affected baserCMS Version : 4.2.0 ~ 4.3.6 (XSS), 3.0.10 ~ 4.3.6 (RCE)
Patches : https://basercms.net/security/20200827

Found by Vulnerability Research team in Flatt Security Inc.