TYPO3-EXT-SA-2019-007: Remote Code Execution in extension "ImageOptimizer" (imageoptimizer)

Categories: Development Created by Torben Hansen
It has been discovered that the extension "ImageOptimizer" (imageoptimizer) is susceptible to Remote Code Execution.
  • Release Date: May 07, 2019
  • Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
  • Vulnerability Type: Remote Code Execution
  • Affected Versions: 2.0.0 and 1.1.2 and below 
  • Severity: High
  • Suggested CVSS v3.0: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:F/RL:O/RC:C
  • CVE: not assigned yet

Problem Description

The extension fails to validate arguments passed to a shell command resulting in Remote Code Execution. The issue is only exploitable, if an attacker is able to upload files directly (e.g. SFTP or FTP) to the filesystem.


Updated versions 2.0.1 and 1.1.3 are available from the TYPO3 extension manager and at https://extensions.typo3.org/extension/download/imageoptimizer/2.0.1/zip/ and https://extensions.typo3.org/extension/download/imageoptimizer/1.1.3/zip/
Users of the extension are advised to update the extension as soon as possible. 


Credits go to Sascha Egerer who discovered and reported the vulnerability.

General Advice

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