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CVE-2021-21359— Denial of Service in Page Error Handling

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，该漏洞允许远程攻击者执行拒绝服务(DoS)攻击。

CVSS 5.9 · Medium EPSS 1.73% · P76

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-21359

Vulnerability Information
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Vulnerability Title
Denial of Service in Page Error Handling
Source: CVE Program / CVE List V5
Vulnerability Description
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.25, 10.4.14, 11.1.1 requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded. This is fixed in versions 9.5.25, 10.4.14, 11.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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，该漏洞允许远程攻击者执行拒绝服务(DoS)攻击。
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 >= 9.0.0, <= 9.5.24 -

II. Public POCs for CVE-2021-21359

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III. Intelligence Information for CVE-2021-21359

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Vendor Advisories for CVE-2021-21359 (1)

Other References for CVE-2021-21359 (2)

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

CVE-2021-21355 8.6 HIGH Unrestricted File Upload in Form Framework
CVE-2021-21357 8.3 HIGH Broken Access Control in Form Framework
CVE-2021-21339 5.9 MEDIUM Cleartext storage of session identifier
CVE-2021-21358 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-674

V. Comments for CVE-2021-21359

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