CVE-2022-1548 in Playbooks Plugin
Summary
by MITRE • 05/04/2022
Mattermost Playbooks plugin 1.25 and earlier fails to properly restrict user-level permissions, which allows playbook members to escalate their membership privileges and perform actions restricted to playbook admins.
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Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-1548 affects the Mattermost Playbooks plugin version 1.25 and earlier, presenting a critical authorization flaw that undermines the security model of collaborative workspace platforms. This issue stems from inadequate permission controls within the plugin's access management system, creating a pathway for privilege escalation that directly impacts the integrity of playbook governance structures. The flaw specifically targets the user-level permission restrictions that should separate playbook members from playbook administrators, allowing unauthorized users to elevate their privileges and execute administrative functions.
The technical implementation of this vulnerability resides in the plugin's insufficient validation of user roles during privilege-sensitive operations. When playbook members attempt to perform actions typically restricted to administrators, the system fails to properly verify their authorization level, enabling malicious or compromised users to bypass intended access controls. This represents a classic case of insufficient authorization checks that aligns with CWE-285, which addresses improper authorization within software applications. The flaw operates at the application logic level where user permissions are not properly enforced during critical operations, creating a direct attack surface that can be exploited through routine playbook interactions.
The operational impact of CVE-2022-1548 extends beyond simple privilege escalation, as it fundamentally compromises the security posture of organizations relying on Mattermost Playbooks for collaborative workflow management. Administrators may lose control over playbook configurations, member management, and access controls, potentially leading to unauthorized modifications of critical business processes. This vulnerability enables attackers to perform actions such as adding or removing members, modifying playbook settings, and potentially accessing sensitive data within the playbook environment. The implications are particularly severe in enterprise settings where playbook administrators maintain strict control over workflow processes and data access.
Organizations should implement immediate mitigations including upgrading to Mattermost Playbooks plugin version 1.26 or later, which contains the necessary authorization fixes. System administrators should also conduct thorough access control reviews to identify any potential privilege escalation that may have occurred before the patch was applied. Additional defensive measures include implementing network segmentation to limit access to Mattermost systems, enabling detailed audit logging for playbook-related activities, and conducting regular security assessments of collaborative platforms. The vulnerability demonstrates the importance of proper access control implementation as outlined in the ATT&CK framework under privilege escalation techniques, specifically targeting the use of application flaws to gain elevated privileges. Organizations should also consider implementing zero-trust security models that continuously validate user permissions regardless of their initial access level, ensuring that even if one control fails, additional layers of protection remain effective.