CVE-2023-5875 in Mattermost
Summary
by MITRE • 11/02/2023
Mattermost Desktop fails to correctly handle permissions or prompt the user for consent on certain sensitive ones allowing media exploitation from a malicious mattermost server
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Analysis
by VulDB Data Team • 11/30/2023
The vulnerability identified as CVE-2023-5875 affects the Mattermost Desktop application, which is a widely used enterprise communication platform that enables secure team collaboration through chat, file sharing, and integration capabilities. This particular flaw represents a critical security weakness in the application's permission handling mechanisms, specifically within its desktop client implementation. The vulnerability stems from insufficient validation and user consent prompts for sensitive system permissions that the desktop application may request during operation or when connecting to malicious servers. This issue creates a significant attack surface that adversaries can exploit to gain unauthorized access to system resources and potentially escalate their privileges within the victim environment.
The technical root cause of this vulnerability lies in the desktop application's failure to properly implement permission checks and user consent workflows for critical system access points. When Mattermost Desktop connects to a malicious server, it may attempt to request or utilize permissions that would normally require explicit user approval or system-level authorization. The application's inadequate handling of these permission requests means that it either automatically grants access without proper verification or fails to prompt users for consent when such access is required. This flaw typically manifests when the desktop client attempts to access system resources such as file systems, network interfaces, or other sensitive capabilities that could be leveraged for malicious purposes. The vulnerability aligns with CWE-250, which describes the improper handling of privileges or permissions, and represents a clear deviation from secure coding practices that should ensure proper authorization checks.
The operational impact of CVE-2023-5875 extends beyond simple data exfiltration or unauthorized access to encompass broader system compromise possibilities. An attacker who successfully exploits this vulnerability could potentially gain access to sensitive files, monitor user activities, or even establish persistent access through the compromised desktop client. The desktop application's trust relationship with the Mattermost server creates a unique attack vector where malicious actors can leverage the legitimate application to perform unauthorized actions on the endpoint. This vulnerability is particularly concerning in enterprise environments where Mattermost Desktop clients are commonly deployed, as it could allow attackers to move laterally within networks or maintain access to sensitive corporate information. The attack pattern follows the ATT&CK framework's privilege escalation and persistence tactics, where the initial compromise through the desktop client enables further malicious activities.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected Mattermost Desktop versions to ensure that proper permission handling and user consent mechanisms are restored. Organizations should implement network monitoring to detect unusual outbound connections from Mattermost Desktop clients to suspicious domains or IP addresses that could indicate exploitation attempts. Security teams should also consider implementing application control policies that restrict desktop application behavior and prevent unauthorized access to system resources. Additionally, user education regarding the importance of verifying server connections and understanding permission requests can help reduce the risk of successful exploitation. Regular security assessments of desktop applications and their interaction with enterprise systems should be conducted to identify similar permission handling vulnerabilities that could be exploited in similar attack scenarios. The vulnerability demonstrates the critical importance of secure permission handling in client applications and the necessity of robust user consent mechanisms in enterprise communication platforms.