Broken Access Control in Form Framework
CVE-2021-21357

8.3HIGH

Key Information:

Vendor

Typo3

Status
Typo3.cms
Vendor
CVE Published:
23 March 2021

What is CVE-2021-21357?

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.

Affected Version(s)

TYPO3.CMS >= 8.0.0, <= 8.7.39 <= 8.0.0, 8.7.39

TYPO3.CMS >= 9.0.0, <= 9.5.24 <= 9.0.0, 9.5.24

TYPO3.CMS >= 10.0.0, <= 10.4.13 <= 10.0.0, 10.4.13

References

https://packagist.org/packages/typo3/cms-form
x_refsource_MISC
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GH...
x_refsource_CONFIRM
https://typo3.org/security/advisory/typo3-core-sa-2021-003
x_refsource_MISC

CVSS V3.1

Score:
8.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.