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Arbitrary Code Execution in TYPO3 CMS

September 05, 2017

Author: Oliver Hader
Keywords: Security, Arbitrary Code Execution

It has been discovered, that TYPO3 CMS is vulnerable to Arbitrary Code Execution.

Component Type: TYPO3 CMS

Release Date: September 5, 2017

Vulnerability Type: Arbitrary Code Execution

Affected Versions: 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4

Severity: None - High (depending on web server configuration)

Suggested CVSS v2.0: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVE: not assigned yet

Problem Description: 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)(\..*)?$|^\.htaccess$

Solution: Update to TYPO3 versions 7.6.22 or 8.7.5 that fix the problem described, make sure overridden settings for TYPO3_CONF_VARS/BE/fileDenyPattern are adjusted.

Credits: Thanks to Maurizio Siddu who reported this issue and to TYPO3 core team member Susanne Moog 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: All security related code changes are tagged so that you can easily look them up on our review system.


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