Release Date: November 14, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 1.2.10 and below
Vulnerability Type: Insecure Unserialize, SQL Injection
Suggested CVSS v2.0: AV:N/AC:M/Au:S/C:P/I:P/A:P/E:F/RL:O/RC:C (What's that?)
Problem Description: The extension unserializes strings from untrusted external source. Furthermore it fails to properly sanitize incoming data and is vulnerable to SQL Injection. For both vulnerabilities a backend user with access to the extension module is needed.
Solution: An updated version 1.2.11 is available from the TYPO3 Extension Manager and at https://typo3.org/extensions/repository/download/mh_code_highlighter/1.2.11/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Marc Hörsken 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 to receive future Security Bulletins via E-mail.