Kirby vulnerable to path traversal in the router for PHP's built-in server

• ECOSYSTEM: introduced 0; fixed 3.9.8.3

### TL;DR This vulnerability affects all Kirby setups that use PHP's built-in server. Such setups are commonly only used during local development. Sites that use other server software (such as Apache, nginx or Caddy) are *not* affected. ---- ### Introduction For use with PHP's built-in web server, Kirby provides a `router.php` file. The router delegates requests to static files to PHP so that assets and other static files in the document root can be accessed by the browser. This logic was vulnerable against path traversal attacks. By using special elements such as `..` and `/` separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the `../` sequence, which in most modern operating systems is interpreted as the parent directory of the current location. ### Impact The missing path traversal check allowed attackers to navigate all files on the server that were accessible to the PHP process, including files outside of the Kirby installation. The vulnerable implementation delegated all existing files to PHP, including existing files outside of the document ro

GitHub Advisory Database via OSV

• ECOSYSTEM: introduced 3.10.0; fixed 3.10.1.2

### TL;DR This vulnerability affects all Kirby setups that use PHP's built-in server. Such setups are commonly only used during local development. Sites that use other server software (such as Apache, nginx or Caddy) are *not* affected. ---- ### Introduction For use with PHP's built-in web server, Kirby provides a `router.php` file. The router delegates requests to static files to PHP so that assets and other static files in the document root can be accessed by the browser. This logic was vulnerable against path traversal attacks. By using special elements such as `..` and `/` separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the `../` sequence, which in most modern operating systems is interpreted as the parent directory of the current location. ### Impact The missing path traversal check allowed attackers to navigate all files on the server that were accessible to the PHP process, including files outside of the Kirby installation. The vulnerable implementation delegated all existing files to PHP, including existing files outside of the document ro

GitHub Advisory Database via OSV

• ECOSYSTEM: introduced 4.0.0; fixed 4.7.1

### TL;DR This vulnerability affects all Kirby setups that use PHP's built-in server. Such setups are commonly only used during local development. Sites that use other server software (such as Apache, nginx or Caddy) are *not* affected. ---- ### Introduction For use with PHP's built-in web server, Kirby provides a `router.php` file. The router delegates requests to static files to PHP so that assets and other static files in the document root can be accessed by the browser. This logic was vulnerable against path traversal attacks. By using special elements such as `..` and `/` separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the `../` sequence, which in most modern operating systems is interpreted as the parent directory of the current location. ### Impact The missing path traversal check allowed attackers to navigate all files on the server that were accessible to the PHP process, including files outside of the Kirby installation. The vulnerable implementation delegated all existing files to PHP, including existing files outside of the document ro

GitHub Advisory Database via OSV