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.

CVSS v3.0 8.3 HIGH
CVSS v2.0 6.5 MEDIUM

8.3^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.5^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:S/C:P/I:P/A:P

Exploitability : 8.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://typo3.org/security/advisory/typo3-core-sa-2021-003	Vendor Advisory
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3vg7-jw9m-pc3f	Third Party Advisory
https://packagist.org/packages/typo3/cms-form	Release Notes Third Party Advisory

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:typo3:typo3::::::::
	cpe:2.3:a:typo3:typo3::::::::
	cpe:2.3:a:typo3:typo3::::::::
	cpe:2.3:a:typo3:typo3::::::::

Information

Published : 2021-03-22 19:15

Updated : 2021-03-26 11:55

NVD link : CVE-2021-21357

Mitre link : CVE-2021-21357

JSON object : View

CWE

CWE-434

Unrestricted Upload of File with Dangerous Type

CWE-20

Improper Input Validation

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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Products Affected

typo3

typo3

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