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CVE-2023-6547— Playbooks access/modification by removed team member

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，该漏洞源于当用户尝试访问 playbook 时，Mattermost 无法验证团队成员身份，从而允许具有 playbook 权限但没有 playbook 所在团队权限的用户访问和修改 playbook。

CVSS 3.7 · Low EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2023-6547

Vulnerability Information
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Vulnerability Title
Playbooks access/modification by removed team member
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost fails to validate team membership when a user attempts to access a playbook, allowing a user with permissions to a playbook but no permissions to the team the playbook is on to access and modify the playbook. This can happen if the user was once a member of the team, got permissions to the playbook and was then removed from the team. 
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/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 其他漏洞
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，该漏洞源于当用户尝试访问 playbook 时，Mattermost 无法验证团队成员身份，从而允许具有 playbook 权限但没有 playbook 所在团队权限的用户访问和修改 playbook。
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 ~ 8.1.5 -

II. Public POCs for CVE-2023-6547

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III. Intelligence Information for CVE-2023-6547

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Same Patch Batch · Mattermost · 2023-12-12 · 8 CVEs total

CVE-2023-45316 7.3 HIGH Reflected client side path traversal leading to CSRF in Playbooks
CVE-2023-46701 6.5 MEDIUM Inaccessible Post Information Leak via Run Timeline IDOR
CVE-2023-45847 4.3 MEDIUM Playbook Plugin Crash via Run Checklist
CVE-2023-49874 4.3 MEDIUM IDOR when updating the tasks of a private playbook run
CVE-2023-49809 4.3 MEDIUM Todo plugin gets crashed and disabled by member
CVE-2023-49607 4.3 MEDIUM Playbook plugin crash via missing interface type assertion
CVE-2023-6727 3.1 LOW Leak Inaccessible Playbook Information via Channel Action IDOR

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-6547

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