Vulnerability Description
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework. In the default configuration of the Form Framework this allows attackers to explicitly allow arbitrary mime-types for file uploads - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, attackers can persist those files in any writable directory of the corresponding TYPO3 installation. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Typo3 | Typo3 | >= 8.0.0, < 8.7.40 |
Related Weaknesses (CWE)
References
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3vg7-jw9m-pc3fThird Party Advisory
- https://packagist.org/packages/typo3/cms-formRelease NotesThird Party Advisory
- https://typo3.org/security/advisory/typo3-core-sa-2021-003Vendor Advisory
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3vg7-jw9m-pc3fThird Party Advisory
- https://packagist.org/packages/typo3/cms-formRelease NotesThird Party Advisory
- https://typo3.org/security/advisory/typo3-core-sa-2021-003Vendor Advisory
FAQ
What is CVE-2021-21357?
CVE-2021-21357 is a vulnerability with a CVSS score of 8.3 (HIGH). TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 due to improper input validation, attackers can by-pass restrictions of predef...
How severe is CVE-2021-21357?
CVE-2021-21357 has been rated HIGH with a CVSS base score of 8.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21357?
Check the references section above for vendor advisories and patch information. Affected products include: Typo3 Typo3.