CVE-2024-36041 in Plasma Workspace
Summary
by MITRE • 07/05/2024
KSmserver in KDE Plasma Workspace (aka plasma-workspace) before 5.27.11.1 and 6.x before 6.0.5.1 allows connections via ICE based purely on the host, i.e., all local connections are accepted. This allows another user on the same machine to gain access to the session manager, e.g., use the session-restore feature to execute arbitrary code as the victim (on the next boot) via earlier use of the /tmp directory.
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Analysis
by VulDB Data Team • 07/10/2024
The vulnerability identified as CVE-2024-36041 affects the KSmserver component within KDE Plasma Workspace, specifically impacting versions prior to 5.27.11.1 and 6.x versions before 6.0.5.1. This issue represents a critical authorization flaw that undermines the security model of the session management system. The vulnerability stems from an improper access control mechanism that allows connections through the Inter-Client Exchange (ICE) protocol based solely on host identification without implementing proper authentication checks. This fundamental flaw creates a dangerous scenario where any local user can establish connections to the session manager without proper verification, effectively bypassing the security boundaries that should protect user sessions.
The technical implementation of this vulnerability lies in the KSmserver's handling of ICE connections, which is a protocol used for communication between X11 clients and servers. When the session manager accepts connections based purely on host information, it fails to validate the identity of connecting processes, creating an attack surface that enables privilege escalation. The flaw specifically affects local connections where the host parameter is used as the sole authentication factor, allowing malicious users to establish unauthorized sessions with the target user's session manager. This weakness is particularly concerning because it operates at the system level where session management controls are critical for maintaining user security boundaries.
The operational impact of this vulnerability is severe and multifaceted, as it enables lateral movement and privilege escalation within a local environment. An attacker with access to the same machine can exploit this vulnerability to gain access to another user's session manager, potentially leading to session hijacking or unauthorized code execution. The most significant risk occurs when attackers leverage the session-restore feature to execute arbitrary code as the victim user during subsequent system boot cycles. This creates a persistent threat vector where malicious code can be injected into the victim's session and executed automatically, effectively providing the attacker with a foothold that persists across system reboots.
The vulnerability aligns with CWE-284, which addresses improper access control issues, and demonstrates characteristics consistent with privilege escalation vulnerabilities in desktop environments. From an attack perspective, this flaw maps to techniques described in the MITRE ATT&CK framework under T1068, which covers 'Local Port Forwarding' and related privilege escalation methods. The attack chain typically involves an attacker gaining local access to a system, identifying the KSmserver process, establishing an ICE connection using the host-based authentication, and then leveraging the session restore functionality to inject malicious code that executes during the victim's next login session.
Mitigation strategies for CVE-2024-36041 focus primarily on updating to the patched versions of KDE Plasma Workspace where the session manager properly validates connection authentication. System administrators should ensure immediate deployment of patches for plasma-workspace versions 5.27.11.1 and 6.0.5.1, as these releases contain the necessary fixes to implement proper authentication checks for ICE connections. Additionally, organizations should implement network segmentation controls to limit local access to session manager components and consider disabling the session restore functionality for users who do not require it. Monitoring for unauthorized connections to the KSmserver component should be implemented through system logs and intrusion detection systems, while access controls should be reviewed to ensure that only authorized processes can establish connections to the session manager service. The underlying principle is to enforce proper authentication mechanisms that validate both host and user identity before granting access to session management resources, thereby preventing the host-based authentication bypass that enables this vulnerability.