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CVE-2021-21355— Unrestricted File Upload in Form Framework

Quick assessment

Affected
TYPO3 TYPO3.CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TYPO3是瑞士TYPO3（Typo3）协会的一套免费开源的内容管理系统(框架)(CMS/CMF)。 TYPO3 Core 存在安全漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 8.6 · High EPSS 1.63% · P76
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I. Basic Information for CVE-2021-21355

Vulnerability Information
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Vulnerability Title
Unrestricted File Upload in Form Framework
Source: CVE Program / CVE List V5
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 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/user_upload/_, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3是瑞士TYPO3（Typo3）协会的一套免费开源的内容管理系统(框架)(CMS/CMF)。 TYPO3 Core 存在安全漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TYPO3 TYPO3.CMS >= 8.0.0, <= 8.7.39 -

II. Public POCs for CVE-2021-21355

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III. Intelligence Information for CVE-2021-21355

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Vendor Advisories for CVE-2021-21355 (1)

Other References for CVE-2021-21355 (2)

Same Patch Batch · TYPO3 · 2021-03-23 · 8 CVEs total

CVE-2021-21357 8.3 HIGH Broken Access Control in Form Framework
CVE-2021-21339 5.9 MEDIUM Cleartext storage of session identifier
CVE-2021-21359 5.9 MEDIUM Denial of Service in Page Error Handling
CVE-2021-21358 5.4 MEDIUM Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ty
CVE-2021-21340 5.4 MEDIUM Cross-Site Scripting in Content Preview
CVE-2021-21370 5.4 MEDIUM Cross-Site Scripting in Content Preview (CType menu)
CVE-2021-21338 4.7 MEDIUM Open Redirection in Login Handling

IV. Related Vulnerabilities

Same product: TYPO3.CMS
Same vendor: TYPO3
Same weakness: CWE-434

V. Comments for CVE-2021-21355

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