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CVE-2024-39777— Malicious remote can invite itself to an arbitrary local channel

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，该漏洞源于共享频道启用时未能禁止未经请求的邀请公开对本地频道的访问权限，这允许恶意远程人员发送带有现有本地频道 ID 的邀请，然后该本地频道将在未经本地管理员同意的情况下共享。

CVSS 8.7 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2024-39777

Vulnerability Information
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Vulnerability Title
Malicious remote can invite itself to an arbitrary local channel
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
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 存在安全漏洞，该漏洞源于共享频道启用时未能禁止未经请求的邀请公开对本地频道的访问权限，这允许恶意远程人员发送带有现有本地频道 ID 的邀请，然后该本地频道将在未经本地管理员同意的情况下共享。
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 9.9.0 -

II. Public POCs for CVE-2024-39777

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III. Intelligence Information for CVE-2024-39777

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Same Patch Batch · Mattermost · 2024-08-01 · 10 CVEs total

CVE-2024-39274 8.7 HIGH Malicious remote can add users to arbitrary teams and channels
CVE-2024-36492 7.4 HIGH Existing local user overwritten by malicious remote
CVE-2024-39832 6.8 MEDIUM Permanently local data deletion by malicious remote
CVE-2024-41144 5.5 MEDIUM Malicious remote can create/update/delete arbitrary posts in arbitrary channels
CVE-2024-39839 4.3 MEDIUM Remote username set to an arbitrary string by remote user
CVE-2024-41162 4.1 MEDIUM Malicious remote can make an arbitrary local channel read-only
CVE-2024-39837 3.8 LOW Malicious remote can create arbitrary channels
CVE-2024-29977 2.7 LOW Malicious remote can create arbitrary reactions on arbitrary posts
CVE-2024-41926 2.7 LOW Malicious remote can claim that a user was synced from another remote

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-284

V. Comments for CVE-2024-39777

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