CVE-2025-34189 is a vulnerability in Vasion Print Virtual Appliance Host (formerly PrinterLogic) and its client application on macOS and Linux platforms. The root cause is improper permission settings on inter-process communication (IPC) files located at /opt/PrinterInstallerClient/tmp, which are created with world-readable and world-writable permissions. This allows any local user to create or modify IPC request files that are subsequently processed by privileged daemons running with elevated rights. Because these daemons do not properly validate or isolate IPC requests by user session, a malicious local user can inject crafted requests that cause the daemon to perform unauthorized actions in the context of other users. This breaks the fundamental security principle of user session isolation, enabling session hijacking, unauthorized command execution, and potential disruption of system integrity and availability. The vulnerability is classified under CWE-732 (Incorrect Permission Assignment for Critical Resource) and CWE-922 (Insecure Storage of Sensitive Information). The CVSS v4.0 score is 6.9 (medium), reflecting local attack vector with low complexity and no user interaction required, but limited to local privilege level and affecting confidentiality and integrity primarily. No patches were linked in the provided data, and no known exploits have been reported yet. The vendor has identified this issue as V-2022-004 — Client Inter-process Security.

For European organizations, this vulnerability poses a significant risk in environments where Vasion Print Virtual Appliance Host is deployed, especially in macOS and Linux client setups. Local attackers, including malicious insiders or compromised user accounts, could exploit this flaw to escalate privileges or hijack other user sessions, potentially leading to unauthorized access to sensitive print jobs or administrative functions. This could result in data leakage, disruption of printing services, or broader system compromise if the daemon performs critical actions. Organizations with shared workstations or multi-user environments are particularly vulnerable. The impact extends to system integrity and availability, as attackers may execute unintended commands or disrupt normal operations. Given the medium severity and local access requirement, the threat is more pronounced in organizations with lax endpoint security or insufficient user privilege management. The lack of known exploits reduces immediate risk but does not eliminate the potential for future exploitation. European entities handling sensitive or regulated data should be alert to this vulnerability to prevent insider threats and maintain compliance with data protection regulations.

To mitigate CVE-2025-34189, organizations should first verify if they are running affected versions of Vasion Print Virtual Appliance Host or client applications on macOS/Linux. Immediate steps include: 1) Restricting permissions on the /opt/PrinterInstallerClient/tmp directory and its contents to allow access only to the privileged daemon user and necessary system accounts, eliminating world-readable and writable settings. 2) Implementing strict local user access controls and monitoring to prevent unauthorized local user activity. 3) Applying any available vendor patches or updates as soon as they are released. 4) Employing application whitelisting and integrity monitoring on IPC files to detect unauthorized modifications. 5) Conducting regular audits of IPC mechanisms and daemon processes to ensure proper session isolation and request validation. 6) Enhancing endpoint security to limit local user capabilities and prevent privilege escalation. 7) If patching is delayed, consider isolating print server hosts or restricting local user access to minimize exposure. These targeted mitigations go beyond generic advice by focusing on IPC file permissions, daemon process validation, and local user privilege management specific to this vulnerability.