Arbitrary Code Execution in extension "Frontend User Registration" (sf_register)

Release Date: September 12, 2016

Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.

Affected Versions: version 6.2.8 and below

Vulnerability Type: Arbitrary Code Execution

Severity: High

Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:O/RC:C (What's that?)

Problem Description: The extension provides the possibility to upload a profile image. The uploaded file is stored in a known directory without proper file type check. An attacker could upload PHP files, guess the name of the created file and therefore execute arbitrary code.

Solution: An updated version 6.2.9 is available from the TYPO3 Extension Manager and at Users of the extension are advised to update the extension as soon as possible.

Credits: Thanks to Falk Huber who discovered and reported the issue.

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.