GHSA-67wg-6j7r-mqh8: Arbitrary Code Execution in TYPO3 CMS

June 5, 2024

Due to a missing file extension in the fileDenyPattern, backend user are allowed to upload *.pht files which can be executed in certain web server setups. The new default fileDenyPattern is the following, which might have been overridden in the TYPO3 Install Tool.

\.(php[3-7]?|phpsh|phtml|pht)(\..*)?$|^\.htaccess$

References

github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2017-09-05-4.yaml
github.com/TYPO3/typo3
github.com/advisories/GHSA-67wg-6j7r-mqh8
typo3.org/security/advisory/typo3-core-sa-2017-007

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