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CVE-2021-32697— Form validation can be skipped

Quick assessment

Affected
neos form
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.

Neos/forms是一个用于构建web表单的开源框架。 Neos/forms 存在安全漏洞，该漏洞源于程序通过创建一个包含有效表单状态的特殊"GET"请求，可以在不调用任何验证器的情况下提交表单。

CVSS 6.5 · Medium EPSS 1.12% · P66

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32697

Vulnerability Information
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Vulnerability Title
Form validation can be skipped
Source: CVE Program / CVE List V5
Vulnerability Description
neos/forms is an open source framework to build web forms. By crafting a special `GET` request containing a valid form state, a form can be submitted without invoking any validators. Form state is secured with an HMAC that is still verified. That means that this issue can only be exploited if Form Finishers cause side effects even if no form values have been sent. Form Finishers can be adjusted in a way that they only execute an action if the submitted form contains some expected data. Alternatively a custom Finisher can be added as first finisher. This regression was introduced with https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Neos/forms 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Neos/forms是一个用于构建web表单的开源框架。 Neos/forms 存在安全漏洞，该漏洞源于程序通过创建一个包含有效表单状态的特殊"GET"请求，可以在不调用任何验证器的情况下提交表单。
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
neos form >= 1.2.0, < 4.3.3 -

II. Public POCs for CVE-2021-32697

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III. Intelligence Information for CVE-2021-32697

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Patches & Fixes for CVE-2021-32697 (3)

Vendor Advisories for CVE-2021-32697 (1)

Other References for CVE-2021-32697 (1)

IV. Related Vulnerabilities

Same weakness: CWE-20

V. Comments for CVE-2021-32697

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