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CVE-2023-37467— Discourse CSP nonce reuse vulnerability for anonymous users

Quick assessment

Affected
discourse discourse
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.

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，该漏洞源于发现的 CSP（内容安全策略）随机数重用漏洞可能允许跨站点脚本（XSS）攻击绕过对匿名（即未经身份验证）用户的 CSP 保护。

CVSS 6.8 · Medium EPSS 0.36% · P29
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I. Basic Information for CVE-2023-37467

Vulnerability Information
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Vulnerability Title
Discourse CSP nonce reuse vulnerability for anonymous users
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. Prior to version 3.1.0.beta7 of the `beta` and `tests-passed` branches, a CSP (Content Security Policy) nonce reuse vulnerability was discovered could allow cross-site scripting (XSS) attacks to bypass CSP protection for anonymous (i.e. unauthenticated) users. There are no known XSS vectors at the moment, but should one be discovered, this vulnerability would allow the XSS attack to bypass CSP and execute successfully. This vulnerability isn't applicable to logged-in users. Version 3.1.0.beta7 contains a patch. The stable branch doesn't have this vulnerability. A workaround to prevent the vulnerability is to disable Google Tag Manager, i.e., unset the `gtm container id` setting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 跨站脚本漏洞
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，该漏洞源于发现的 CSP（内容安全策略）随机数重用漏洞可能允许跨站点脚本（XSS）攻击绕过对匿名（即未经身份验证）用户的 CSP 保护。
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 >= 3.1.0.beta1, < 3.1.0.beta7 -

II. Public POCs for CVE-2023-37467

# POC Description Source Link Shenlong Link
1 None https://github.com/ibrahmsql/CVE-2023-37467 POC Details
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III. Intelligence Information for CVE-2023-37467

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Patches & Fixes for CVE-2023-37467 (1)

Vendor Advisories for CVE-2023-37467 (1)

Same Patch Batch · discourse · 2023-07-28 · 6 CVEs total

CVE-2023-38684 5.3 MEDIUM Discourse vulnerable to ossible DDoS due to unbounded limits in various controller actions
CVE-2023-38685 4.3 MEDIUM Discourse's restricted tag information visible to unauthenticated users
CVE-2023-38498 4.3 MEDIUM Discourse vulnerable to DoS via defer queue
CVE-2023-37906 4.3 MEDIUM Discourse vulnerable to DoS via post edit reason
CVE-2023-37904 2.6 LOW Discourse Race Condition in Accept Invite

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-323

V. Comments for CVE-2023-37467

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