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CVE-2021-43850— Denial of Service in discourse

Quick assessment

Affected
discourse discourse
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.

Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse 存在安全漏洞，该漏洞源于软件对于特殊的路径参数缺少有效的控制与过滤。管理员用户可以通过/message-bus/_diagnostics路径触发拒绝服务攻击。该漏洞对多站点的Discourse实例(多个论坛由一个应用服务器提供服务)的影响更大，其中任何论坛上的任何管理用户都能够访问/message-bus/_diagnostics路径。

CVSS 6.8 · Medium EPSS 0.83% · P55

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-43850

Vulnerability Information
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Vulnerability Title
Denial of Service in discourse
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source platform for community discussion. In affected versions admins users can trigger a Denial of Service attack via the `/message-bus/_diagnostics` path. The impact of this vulnerability is greater on multisite Discourse instances (where multiple forums are served from a single application server) where any admin user on any of the forums are able to visit the `/message-bus/_diagnostics` path. The problem has been patched. Please upgrade to 2.8.0.beta10 or 2.7.12. No workarounds for this issue exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse 存在安全漏洞，该漏洞源于软件对于特殊的路径参数缺少有效的控制与过滤。管理员用户可以通过/message-bus/_diagnostics路径触发拒绝服务攻击。该漏洞对多站点的Discourse实例(多个论坛由一个应用服务器提供服务)的影响更大，其中任何论坛上的任何管理用户都能够访问/message-bus/_diagnostics路径。
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
discourse discourse < 2.7.12 -

II. Public POCs for CVE-2021-43850

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III. Intelligence Information for CVE-2021-43850

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Patches & Fixes for CVE-2021-43850 (1)

Vendor Advisories for CVE-2021-43850 (1)

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-20

V. Comments for CVE-2021-43850

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