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CVE-2021-37864— Users can view the contents of an archived channel when access is explicitly denied by the system admin

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 6.1 及更早版本存在安全漏洞，该漏洞允许经过身份验证的用户查看存档频道的内容。

CVSS 2.6 · Low EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-37864

Vulnerability Information
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Vulnerability Title
Users can view the contents of an archived channel when access is explicitly denied by the system admin
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/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 6.1 及更早版本存在安全漏洞，该漏洞允许经过身份验证的用户查看存档频道的内容。
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 unspecified ~ 6.2 -

II. Public POCs for CVE-2021-37864

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III. Intelligence Information for CVE-2021-37864

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Other References for CVE-2021-37864 (1)

Same Patch Batch · Mattermost · 2022-01-18 · 4 CVEs total

CVE-2021-37866 4.7 MEDIUM Session is not invalidated on server-side when user logged out of Boards
CVE-2021-37865 4.3 MEDIUM Server-side Denial of Service while processing a specifically crafted GIF file
CVE-2021-37867 4.3 MEDIUM Emails of all users are exposed via one of the Boards APIs

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-37864

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