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CVE-2022-23549— Discourse vulnerable to bypass of post max_length using HTML comments

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 2.8.14之前版本（stable）、2.9.0.beta16之前版本（beta和tests-passed）存在安全漏洞。攻击者利用该漏洞可以通过包含不计入字符限制的html注释来创建原始正文长于“max_length”站点设置的帖子。

CVSS 5.7 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2022-23549

Vulnerability Information
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Vulnerability Title
Discourse vulnerable to bypass of post max_length using HTML comments
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an option source discussion platform. Prior to version 2.8.14 on the `stable` branch and version 2.9.0.beta16 on the `beta` and `tests-passed` branches, users can create posts with raw body longer than the `max_length` site setting by including html comments that are not counted toward the character limit. This issue is patched in versions 2.8.14 and 2.9.0.beta16. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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 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 2.8.14之前版本（stable）、2.9.0.beta16之前版本（beta和tests-passed）存在安全漏洞。攻击者利用该漏洞可以通过包含不计入字符限制的html注释来创建原始正文长于“max_length”站点设置的帖子。
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 2.8.14 ~ 2.8.14 -

II. Public POCs for CVE-2022-23549

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III. Intelligence Information for CVE-2022-23549

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Patches & Fixes for CVE-2022-23549 (1)

Vendor Advisories for CVE-2022-23549 (1)

Same Patch Batch · discourse · 2023-01-05 · 8 CVEs total

CVE-2023-22454 8.0 HIGH Discourse vulnerable to Cross-site Scripting through pending post titles descriptions
CVE-2023-22455 6.8 MEDIUM Discourse vulnerable to Cross-site Scripting through tag descriptions
CVE-2022-23548 6.5 MEDIUM Discourse 跨站脚本漏洞
CVE-2022-46177 5.7 MEDIUM Discourse password reset link can lead to in account takeover if user changes to a new ema
CVE-2022-23546 5.5 MEDIUM Discourse vulnerable to private topic leak via email#send_digest
CVE-2023-22453 5.3 MEDIUM Discourse vulnerable to exposure of user post counts per topic to unauthorized users
CVE-2022-46168 3.5 LOW Group SMTP user emails are exposed in CC email header

IV. Related Vulnerabilities

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

V. Comments for CVE-2022-23549

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