CVE-2021-21355

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-21355
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21355.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-21355
Aliases
Published
2021-03-23T02:15:12Z
Modified
2024-06-06T13:25:04.567745Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L CVSS Calculator
Summary
[none]
Details

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 the lack of ensuring file extensions belong to configured allowed mime-types, attackers can upload arbitrary data with arbitrary file extensions - however, default fileDenyPattern successfully blocked files like .htaccess or malicious.php. Besides that, UploadedFileReferenceConverter transforming uploaded files into proper FileReference domain model objects handles possible file uploads for other extensions as well - given those extensions use the Extbase MVC framework, make use of FileReference items in their direct or inherited domain model definitions and did not implement their own type converter. In case this scenario applies, UploadedFileReferenceConverter accepts any file mime-type and persists files in the default location. In any way, uploaded files are placed in the default location /fileadmin/userupload/_, in most scenarios keeping the submitted filename - which allows attackers to directly reference files, or even correctly guess filenames used by other individuals, disclosing this information. No authentication is required to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.

References

Affected packages

Git / github.com/typo3/typo3.cms

Affected ranges

Type
GIT
Repo
https://github.com/typo3/typo3.cms
Events

Affected versions

v11.*

v11.0.0
v11.1.0