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CVE-2023-40703— Denial of Service via specially crafted block fields in Mattermost Boards

Quick assessment

Affected
Mattermost Mattermost
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.

Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 存在安全漏洞，该漏洞源于无法正确限制 Mattermost Boards 中块的不同字段中允许的字符，从而允许攻击者通过使用特制字符串修补块的字段来消耗过多的资源，可能导致拒绝服务。

CVSS 4.3 · Medium EPSS 0.72% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-40703

Vulnerability Information
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Vulnerability Title
Denial of Service via specially crafted block fields in Mattermost Boards
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string. 
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
Mattermost 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 存在安全漏洞，该漏洞源于无法正确限制 Mattermost Boards 中块的不同字段中允许的字符，从而允许攻击者通过使用特制字符串修补块的字段来消耗过多的资源，可能导致拒绝服务。
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
Mattermost Mattermost 0 ~ 7.8.12 -

II. Public POCs for CVE-2023-40703

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III. Intelligence Information for CVE-2023-40703

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Same Patch Batch · Mattermost · 2023-11-27 · 9 CVEs total

CVE-2023-47168 4.3 MEDIUM Open redirect in /oauth/<service>/mobile_login?redirect_to=
CVE-2023-6202 4.3 MEDIUM Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
CVE-2023-43754 4.3 MEDIUM Permalink previews displayed for posts in archived channels even if users are disallowed t
CVE-2023-48369 4.3 MEDIUM Log Flooding due to specially crafted requests in different endpoints
CVE-2023-48268 4.3 MEDIUM Denial of Service via Board Import Zip Bomb
CVE-2023-45223 4.3 MEDIUM Users full name disclosure through Mattermost Boards with Show Full Name Option disabled
CVE-2023-47865 4.3 MEDIUM Username and Icon override can be used by members when Hardened Mode is enabled
CVE-2023-35075 3.1 LOW HTML injection via channel autocomplete

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-40703

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