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CVE-2021-39173— Forced reinstall

Quick assessment

Affected
fiveai Cachet
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.

Github Cachet是一个应用软件。一个开源状态页面系统。 Cachet 存在安全漏洞，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(User或Admin)如何，都可以欺骗Cachet并再次安装实例。攻击者可利用该漏洞导致任意代码在服务器上执行。

CVSS 8.8 · High EPSS 2.36% · P82

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-39173

Vulnerability Information
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Vulnerability Title
Forced reinstall
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 trick Cachet and install the instance again, leading to arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving the middleware `ReadyForUse`, which now performs a stricter validation of the instance name. 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
不正确的类型转换
Source: CVE Program / CVE List V5
Vulnerability Title
Cachet 代码问题漏洞
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 存在安全漏洞，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(User或Admin)如何，都可以欺骗Cachet并再次安装实例。攻击者可利用该漏洞导致任意代码在服务器上执行。
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-2021-39173

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III. Intelligence Information for CVE-2021-39173

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Security Blog Posts for CVE-2021-39173 (1)

Other References for CVE-2021-39173 (1)

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

CVE-2021-39172 8.8 HIGH New line injection during configuration edition
CVE-2021-39174 8.8 HIGH Configuration leak

IV. Related Vulnerabilities

Same product: Cachet
Same vendor: fiveai
Same weakness: CWE-704

V. Comments for CVE-2021-39173

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