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CVE-2021-39172— New line injection during configuration edition

Quick assessment

Affected
fiveai Cachet
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Github Cachet是一个应用软件。一个开源状态页面系统。 Cachet 存在注入漏洞，该漏洞源于在 2.5.1 版本之前，经过身份验证的用户，无论其权限如何（用户或管理员），都可以利用配置版本功能（例如邮件设置）中的新行注入并在服务器上获得任意代码执行。

CVSS 8.8 · High EPSS 29.17% · P98
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I. Basic Information for CVE-2021-39172

Vulnerability Information
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Vulnerability Title
New line injection during configuration edition
Source: CVE Program / CVE List V5
Vulnerability Description
Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Cachet 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Github Cachet是一个应用软件。一个开源状态页面系统。 Cachet 存在注入漏洞，该漏洞源于在 2.5.1 版本之前，经过身份验证的用户，无论其权限如何（用户或管理员），都可以利用配置版本功能（例如邮件设置）中的新行注入并在服务器上获得任意代码执行。
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
fiveai Cachet < 2.5.1 -

II. Public POCs for CVE-2021-39172

# POC Description Source Link Shenlong Link
1 Cachet 2.4 Code Execution via Laravel Configuration Injection CVE-2021-39172 https://github.com/W1ngLess/CVE-2021-39172-RCE POC Details
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III. Intelligence Information for CVE-2021-39172

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Vendor Advisories for CVE-2021-39172 (1)

Security Blog Posts for CVE-2021-39172 (1)

Other References for CVE-2021-39172 (1)

Same Patch Batch · fiveai · 2021-08-27 · 3 CVEs total

CVE-2021-39173 8.8 HIGH Forced reinstall
CVE-2021-39174 8.8 HIGH Configuration leak

IV. Related Vulnerabilities

Same product: Cachet
Same vendor: fiveai
Same weakness: CWE-93

V. Comments for CVE-2021-39172

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