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CVE-2023-3613— Guest accounts invited and added to channels by Welcomebot plugin

Quick assessment

Affected
Mattermost Mattermost Plugins
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 WelcomeBot plugin存在安全漏洞，该漏洞源于该插件无法验证会员状态，允许将访客添加或邀请到频道。

CVSS 3.5 · Low EPSS 0.29% · P22
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I. Basic Information for CVE-2023-3613

Vulnerability Information
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Vulnerability Title
Guest accounts invited and added to channels by Welcomebot plugin
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
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 WelcomeBot plugin存在安全漏洞，该漏洞源于该插件无法验证会员状态，允许将访客添加或邀请到频道。
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 Plugins 0 ~ 7.8.5 -

II. Public POCs for CVE-2023-3613

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III. Intelligence Information for CVE-2023-3613

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Same Patch Batch · Mattermost · 2023-07-17 · 13 CVEs total

CVE-2023-3615 8.1 HIGH Lack of server certificate validation in websockets connection
CVE-2023-3581 6.2 MEDIUM WebSockets accept connections from HTTPS origin
CVE-2023-3591 4.8 MEDIUM Lack of previous password reset tokens on new token creation
CVE-2023-3582 4.3 MEDIUM Lack of channel membership check when linking a board to a channel
CVE-2023-3585 4.3 MEDIUM channel DoS by sharing a boards link
CVE-2023-3614 4.3 MEDIUM Denial of Service via specially crafted gif image
CVE-2023-3593 4.3 MEDIUM Server crash via a specially crafted markdown input
CVE-2023-3586 4.2 MEDIUM Disabling publicly-shared boards does not disable existing publicly available board links
CVE-2023-3577 3.5 LOW Limited blind SSRF to localhost/intranet in interactive dialog implementation
CVE-2023-3584 3.1 LOW Member can create team with team override scheme
CVE-2023-3590 3.1 LOW Deleted attachments in Boards remain accessible
CVE-2023-3587 2.7 LOW Inconsistent state in UI after boards permission change by system admin

IV. Related Vulnerabilities

Same vendor: Mattermost
Same weakness: CWE-863

V. Comments for CVE-2023-3613

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