GHSA-8h4m-r4wm-xj7r: TYPO3 Arbitrary Code Execution via File List Module
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).
References
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2019-01-22-7.yaml
- github.com/TYPO3/typo3
- github.com/TYPO3/typo3/commit/095ae4ab6869d0f7dc7befedb851cdd7ad0c7ebf
- github.com/TYPO3/typo3/commit/9990278ce7cf8e4d6b8bf31edec6787722d38b0f
- github.com/advisories/GHSA-8h4m-r4wm-xj7r
- typo3.org/security/advisory/typo3-core-sa-2019-008
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