GHSA-8h4m-r4wm-xj7r TYPO3 Arbitrary Code Execution via File List Module

• Packagist typo3/cms: >= 8.0.0, < 8.7.23 → fixed in 8.7.23 • Packagist typo3/cms: >= 9.0.0, < 9.5.4 → fixed in 9.5.4

Due to missing file extensions in $GLOBALS['TYPO3_CONF_VARS']['BE'][‘fileDenyPattern’], backend users are allowed to upload *.phar, *.shtml, *.pl or *.cgi files which can be executed in certain web server setups. A valid backend user account is needed in order to exploit this vulnerability. Derivatives of Debian GNU Linux are handling *.phar files as PHP applications since PHP 7.1 (for unofficial packages) and PHP 7.2 (for official packages). The file extension *.shtml is bound to server side includes which are not enabled per default in most common Linux based distributions. File extension *.pl and *.cgi require additional handlers to be configured which is also not the case in most common distributions (except for /cgi-bin/ location).