TYPO3-CORE-SA-2019-008: Arbitrary Code Execution via File List Module

Categories: Development
It has been discovered, that TYPO3 CMS is vulnerable to arbitrary code execution.
  • Component Type: TYPO3 CMS
  • Vulnerable subcomponent: File List (ext:filelist)
  • Release Date: January 22, 2019
  • Vulnerability Type: Arbitrary Code Execution
  • Affected Versions: 8.0.0-8.7.22 and 9.0.0-9.5.3
  • Severity: None - Critical (depending on web server configuration)
  • Suggested CVSS v3.0: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
  • CVE: not assigned yet

Problem Description

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).


Update to TYPO3 versions 8.7.23 or 9.5.4 to fix the problem described.


Thanks to Edgar Boda-Majer and Lauritz Holtmann who reported these issues and to TYPO3 core team member Oliver Hader who fixed the issue.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.

General Note

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