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CVE-2024-21655— Insufficient control of custom field value sizes

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 3.2.0.beta4之前、3.1.4之前版本存在资源管理错误漏洞，该漏洞源于对客户端可编辑的字段不施加大小限制，攻击者利用该漏洞可以导致 Discourse 实例使用过多的磁盘空间和带宽。

CVSS 4.3 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2024-21655

Vulnerability Information
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Vulnerability Title
Insufficient control of custom field value sizes
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is a platform for community discussion. For fields that are client editable, limits on sizes are not imposed. This allows a malicious actor to cause a Discourse instance to use excessive disk space and also often excessive bandwidth. The issue is patched 3.1.4 and 3.2.0.beta4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 资源管理错误漏洞
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 3.2.0.beta4之前、3.1.4之前版本存在资源管理错误漏洞，该漏洞源于对客户端可编辑的字段不施加大小限制，攻击者利用该漏洞可以导致 Discourse 实例使用过多的磁盘空间和带宽。
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 < 3.1.4 -

II. Public POCs for CVE-2024-21655

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III. Intelligence Information for CVE-2024-21655

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Vendor Advisories for CVE-2024-21655 (1)

Same Patch Batch · discourse · 2024-01-12 · 4 CVEs total

CVE-2023-48297 8.6 HIGH Discourse vulnerable to unlimited mentioned users in message serializer
CVE-2023-49098 3.5 LOW Reaction data for user notifications exposed in Discourse-reactions
CVE-2023-49099 3.1 LOW Discourse secure uploads accessible to guests even when login is required

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-400

V. Comments for CVE-2024-21655

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