CVE-2016-7188 in Windows
Summary
by MITRE
The Standard Collector Service in Windows Diagnostics Hub in Microsoft Windows 10 Gold, 1511, and 1607 mishandles library loading, which allows local users to gain privileges via a crafted application, aka "Windows Diagnostics Hub Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 09/23/2024
The vulnerability identified as CVE-2016-7188 resides within the Standard Collector Service component of Windows Diagnostics Hub, a subsystem designed to collect diagnostic information from various Windows components. This service operates with elevated privileges to gather system telemetry and diagnostic data, making it a critical target for privilege escalation attacks. The vulnerability manifests in how the service handles dynamic library loading operations, specifically when processing external dependencies during diagnostic data collection processes. Microsoft Windows 10 versions 10.0.10240, 10.0.10586, and 10.0.14393 are affected, representing the initial release, the November 2015 Update, and the Anniversary Update respectively. The flaw allows local attackers to manipulate the library loading sequence and inject malicious code into the privileged process, thereby elevating their execution context from standard user to system level privileges.
The technical root cause of this vulnerability aligns with CWE-427, which describes uncontrolled search path dependencies in software systems. The Standard Collector Service fails to properly validate or restrict the paths from which it loads dynamic link libraries, creating an opportunity for attackers to place malicious DLL files in locations that the service will subsequently load. This occurs because the service does not implement proper security measures such as explicit path resolution or library validation checks before executing loaded components. When a malicious application is launched that triggers the diagnostics service to load a crafted DLL, the system executes the attacker-controlled code with elevated privileges, bypassing standard security boundaries that normally protect against such attacks. The vulnerability exploits the principle of least privilege violation by allowing a local user to escalate their privileges without requiring authentication or specific administrative credentials.
The operational impact of CVE-2016-7188 extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within Windows 10 systems that can be leveraged for further compromise. Attackers can utilize this vulnerability to establish backdoors, extract sensitive system information, or deploy additional malware without requiring additional attack vectors. The vulnerability affects a core Windows diagnostic service that runs continuously, making it a valuable target for attackers seeking long-term system access. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1068, which covers privilege escalation through the use of local exploit tools, and T1546, covering event trigger-based execution. The attack surface is particularly concerning because it requires no network connectivity and can be exploited through local file system manipulation, making detection and prevention more challenging for security teams.
Mitigation strategies for this vulnerability should focus on immediate patch deployment through Microsoft's regular security updates, as the vendor released patches in the corresponding security bulletins for this flaw. System administrators should ensure that all Windows 10 systems are updated to the latest security patches, particularly those addressing the Windows Diagnostics Hub service. Additional protective measures include implementing application whitelisting policies to restrict which executables can run on affected systems, monitoring for suspicious library loading patterns through Windows Event Logs, and employing behavioral analysis tools to detect anomalous activities that may indicate exploitation attempts. The vulnerability also underscores the importance of following secure coding practices such as using absolute paths for library loading, implementing proper input validation, and adhering to the principle of least privilege when designing system services. Organizations should consider implementing additional security controls such as mandatory access controls, enhanced logging, and regular security assessments to identify and remediate similar vulnerabilities in other system components.