TYPO3-CORE-SA-2015-003: Frontend login Session Fixation

Categories: TYPO3 CMS created by Helmut Hummel
It has been discovered that TYPO3 is susceptible to session fixation.
Component Type: TYPO3 CMS Release Date: July 1, 2015

Vulnerable subcomponent: Frontend Logon

Vulnerability Type: Session Fixation Affected Versions: Versions 6.2.0 to 6.2.13, 7.0.0 to 7.3.0 Severity: Low Suggested CVSS v2.0: AV:N/AC:H/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C CVE: not assigned yet Problem Description: It has been discovered that TYPO3 is susceptible to session fixation. If a user authenticates while anonymous session data is present, the session id is not changed. This makes it possible for attackers to generate a valid session id, trick users into using this session id (e.g. by leveraging a different Cross-Site Scripting vulnerability) and then maybe getting access to an authenticated session. Solution: Update to TYPO3 versions 6.2.14 or 7.3.1 that fix the problem described. Credits: Thanks to Helmut Hummel 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. General Note: All security related code changes are tagged so that you can easily look them up on our review system.