CVE-2019-1287 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Network Connectivity Assistant handles objects in memory, aka 'Windows Network Connectivity Assistant Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 08/20/2020
The Windows Network Connectivity Assistant elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows operating systems. This vulnerability specifically affects how the Network Connectivity Assistant component processes memory objects, creating an exploitable condition that can be leveraged by malicious actors to gain higher-level system access. The vulnerability resides in the Windows operating system's network connectivity management subsystem, which is designed to assist users in connecting to networks but inadvertently creates a pathway for unauthorized privilege escalation.
The technical flaw manifests in the improper handling of memory objects within the Network Connectivity Assistant service, which operates with elevated privileges to manage network connections. When the service processes certain network-related objects or data structures, it fails to properly validate input parameters or memory boundaries, leading to potential memory corruption or manipulation. This memory handling weakness enables attackers to craft malicious inputs that can cause the service to execute code with elevated privileges, effectively bypassing normal user access controls. The vulnerability is particularly concerning because it operates at a system level where network connectivity management typically requires elevated permissions to function properly.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within the target system. Once exploited, the attacker can gain administrative access to the Windows machine, potentially leading to complete system compromise. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments. Network connectivity assistants are commonly used in corporate networks for automatic connection management, which means the vulnerability could be exploited in various network configurations and environments.
Mitigation strategies for this vulnerability focus on applying Microsoft security updates and patches immediately upon release, as the flaw was addressed through the Windows security bulletin released in the same timeframe. Organizations should implement network segmentation and access controls to limit potential exploitation vectors, particularly focusing on restricting network connectivity assistant service access. The vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and can be mapped to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation.' Security teams should also consider implementing monitoring for suspicious network connectivity assistant service behavior and establishing baseline network connectivity patterns to detect anomalous activity that might indicate exploitation attempts.
Additional protective measures include disabling unnecessary network connectivity assistant features, implementing application whitelisting policies, and conducting regular security assessments of Windows network management components. Organizations should also consider deploying endpoint detection and response solutions that can identify suspicious privilege escalation attempts and memory manipulation activities. The vulnerability demonstrates the importance of secure coding practices in system-level components and highlights the risks associated with services that operate with elevated privileges without proper input validation and memory management controls. Regular security awareness training for administrators and security personnel is essential to recognize potential exploitation attempts and maintain overall system security posture.