Problem

It has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability.

Solution

Update to TYPO3 versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described.

Credits

Thanks to Alexander Kellner who reported this issue and to TYPO3 security team member Torben Hansen who fixed the issue.

References

• TYPO3-CORE-SA-2021-001

References

• GHSA-4jhw-2p6j-5wmp
• https://packagist.org/packages/typo3/cms-core
• https://nvd.nist.gov/vuln/detail/CVE-2021-21338
• https://typo3.org/security/advisory/typo3-core-sa-2021-001
• https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21338.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21338.yaml