CVE-2016-7102 in ownCloud Desktop
Summary
by MITRE
ownCloud Desktop before 2.2.3 allows local users to execute arbitrary code and possibly gain privileges via a Trojan library in a "special path" in the C: drive.
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Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2016-7102 affects ownCloud Desktop client versions prior to 2.2.3, presenting a significant security risk through a Trojan library attack vector. This flaw enables local attackers to execute arbitrary code and potentially escalate privileges by placing malicious libraries in specially crafted paths within the C: drive. The vulnerability stems from improper handling of dynamic library loading mechanisms within the desktop synchronization client, where the application fails to validate the authenticity and integrity of libraries loaded from specific directories. The issue is particularly concerning as it leverages the Windows operating system's library search order behavior, allowing attackers to inject malicious code that gets executed when the legitimate application attempts to load dependencies.
The technical implementation of this vulnerability exploits the way Windows resolves dynamic link library (DLL) dependencies, specifically when applications search for required libraries in predictable locations. When the ownCloud Desktop client runs and encounters a required library, it follows a standard search path that includes the current working directory, system directories, and other locations where attackers can place malicious files. This behavior aligns with CWE-427: Uncontrolled Search Path Element, which describes how applications that do not properly control the search path for dynamic libraries can be tricked into loading malicious code. The vulnerability demonstrates a classic privilege escalation vector through DLL hijacking techniques, where an attacker places a malicious library with the same name as a legitimate dependency in a location that gets searched before the actual library.
The operational impact of CVE-2016-7102 extends beyond simple code execution to potential system compromise and data theft. Local users who can write to the C: drive or create files in specific directories gain the ability to manipulate the application's execution flow and potentially elevate their privileges to the level of the running ownCloud process. This risk is particularly amplified in enterprise environments where users may have local access to systems but not administrative rights, as the vulnerability allows for privilege escalation without requiring elevated permissions. The attack scenario typically involves an attacker placing a malicious DLL in a directory that gets prioritized in the Windows library search order, such as the C: drive root or other common application directories, thereby enabling code execution when the ownCloud client loads the library.
Mitigation strategies for this vulnerability focus on both application-level fixes and system-wide security hardening measures. The primary solution involves updating to ownCloud Desktop client version 2.2.3 or later, which implements proper library loading validation and prevents loading of unauthorized libraries from potentially compromised locations. Organizations should also implement the principle of least privilege and restrict local file system access to prevent attackers from placing malicious files in critical directories. Security controls such as application whitelisting, dynamic code analysis, and monitoring for suspicious library loading activities can help detect and prevent exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to T1059.001: Command and Scripting Interpreter: PowerShell and T1546.008: Event Triggered Execution: DLL Side-Loading, demonstrating how attackers can leverage legitimate system mechanisms to execute malicious code. System administrators should also consider implementing security controls that monitor for unauthorized library modifications and ensure that only trusted code is executed within the application environment.