• Component Type: TYPO3 CMS
• Subcomponent: Password Reset (ext:backend)
• Release Date: May 12, 2020
• Vulnerability Type: Information Disclosure
• Affected Versions: 10.4.0-10.4.1
• Severity: Low
• Suggested CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C
• References: CVE-2020-11063, CWE-204

Problem Description

It has been discovered that time-based attacks can be used with the password reset functionality for backend users. This allows an attacker to verify whether a backend user account with a given email address exists or not.

Solution

Update to TYPO3 version 10.4.2 that fixes the problem described.

Credits

Thanks to Michael Kasten who reported this issue and to TYPO3 merger Frank Nägler 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 in our review system.