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CVE-2023-23621— Discourse vulnerable to ReDoS in user agent parsing

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 3.0.1之前版本（稳定版）、3.1.0.beta2之前版本（测试版和测试通过版）存在安全漏洞。攻击者利用该漏洞使用特制的代理导致正则表达式拒绝服务。

CVSS 8.6 · High EPSS 0.87% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-23621

Vulnerability Information
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Vulnerability Title
Discourse vulnerable to ReDoS in user agent parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches, a malicious user can cause a regular expression denial of service using a carefully crafted user agent. This issue is patched in version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 安全漏洞
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 3.0.1之前版本（稳定版）、3.1.0.beta2之前版本（测试版和测试通过版）存在安全漏洞。攻击者利用该漏洞使用特制的代理导致正则表达式拒绝服务。
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 < 3.0.1 -

II. Public POCs for CVE-2023-23621

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III. Intelligence Information for CVE-2023-23621

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Patches & Fixes for CVE-2023-23621 (2)

Vendor Advisories for CVE-2023-23621 (1)

Same Patch Batch · discourse · 2023-01-27 · 5 CVEs total

CVE-2023-23620 5.3 MEDIUM Discourse restricted tag routes leak topic information
CVE-2023-23624 4.3 MEDIUM Discourse's exclude_tags param could leak which topics had a specific hidden tag
CVE-2023-22740 4.3 MEDIUM Discourse vulnerable to Allocation of Resources Without Limits via Chat drafts
CVE-2023-23616 3.5 LOW Discourse membership requests lack character limit

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-1333

V. Comments for CVE-2023-23621

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