FearlessCMS Arbitrary Code Execution Vulnerability

FearlessCMS, a flat-file content management system, contains an arbitrary code execution vulnerability in versions 0.1.2b and earlier.

An authenticated administrator can set an arbitrary Git repository URL through admin/updater-handler.php and trigger perform_update, which passes the URL to update.sh. The updater clones the repository and replaces the live plugins/, admin/, and includes/ directories without verifying the repository's identity, signatures, or contents.

• Affected versions: 0.1.2b and earlier
• Attack requires authenticated administrator access
• Because router.php permits existing PHP files under plugins to be executed by the PHP development server, attacker-supplied update content can execute arbitrary PHP with the web server process's privileges and persist as a backdoor.
• Fixed in version 0.1.3b