CVE-2014-5455 in OpenVPN
Summary
by MITRE
Unquoted Windows search path vulnerability in the ptservice service prior to PrivateTunnel version 3.0 (Windows) and OpenVPN Connect version 3.1 (Windows) allows local users to gain privileges via a crafted program.exe file in the %SYSTEMDRIVE% folder.
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Analysis
by VulDB Data Team • 05/29/2026
The vulnerability identified as CVE-2014-5455 represents a critical unquoted search path weakness that exists within the ptservice component of PrivateTunnel 2.3.8 when integrated with OpenVPN 2.1.28.0. This flaw stems from improper handling of executable paths during service initialization, creating a privilege escalation vector that can be exploited by local attackers. The vulnerability specifically affects the Windows operating system's service execution mechanism where the system searches for executables in a predictable order without proper path quoting, allowing malicious actors to place crafted binaries in strategic locations within the system hierarchy.
The technical exploitation of this vulnerability occurs when the ptservice service attempts to execute a program located in the %SYSTEMDRIVE% folder without properly quoting the path specification. Windows service management follows a specific search order where it first checks the current directory, then proceeds through the system PATH environment variables, and finally examines the directory where the service executable is located. When the service configuration contains unquoted paths, attackers can place malicious executables in parent directories of the intended program, causing the service to execute the attacker-controlled binary instead of the legitimate one. This behavior directly maps to CWE-428, which describes the weakness of unquoted search paths that allow attackers to execute unauthorized code.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and persistent access for malicious actors. Local users who can write to the %SYSTEMDRIVE% folder can leverage this weakness to elevate their privileges to SYSTEM level, enabling them to install rootkits, modify system files, or establish backdoors. The vulnerability is particularly concerning because it requires no special privileges to exploit initially, as local users can simply place a malicious program.exe file in the root of the system drive, and the service will execute it when it attempts to start or restart. This creates a persistent threat vector that can be exploited even after system reboots, making it a significant concern for enterprise environments where local account compromise is possible.
Mitigation strategies for CVE-2014-5455 should focus on both immediate remediation and long-term architectural improvements to prevent similar issues. The most effective immediate solution involves properly quoting service paths during installation, ensuring that all executable paths in service configurations contain proper quotation marks to prevent path traversal attacks. System administrators should conduct comprehensive audits of all installed services to identify and correct unquoted paths, particularly those that reference locations in the system drive or other commonly accessible directories. Additionally, implementing proper access controls and privilege separation can limit the damage that can be caused by such vulnerabilities. The mitigation approach aligns with ATT&CK technique T1068 which covers privilege escalation through service misconfiguration, and organizations should consider applying the principle of least privilege to service accounts to limit potential damage. Regular security assessments and service configuration reviews should be implemented to prevent similar issues from emerging in future deployments, as this vulnerability demonstrates the importance of secure coding practices in service development and installation processes.