CVE-2017-8515 in Windows
Summary
by MITRE
Microsoft Windows 10 1511, 1607, and 1703, and Windows Server 2016 allow an unauthenticated attacker to send a specially crafted kernel mode request to cause a denial of service on the target system, aka "Windows VAD Cloning Denial of Service Vulnerability".
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Analysis
by VulDB Data Team • 08/20/2024
The vulnerability identified as CVE-2017-8515 represents a critical denial of service weakness in Microsoft Windows operating systems including Windows 10 versions 1511, 1607, and 1703 along with Windows Server 2016. This flaw exists within the kernel mode execution environment and specifically targets the Virtual Address Descriptor (VAD) cloning mechanism that Windows employs for memory management operations. The vulnerability stems from inadequate validation of kernel mode requests that can be initiated by unauthenticated attackers without requiring any prior system access or privileges. According to CWE-122, this vulnerability falls under improper restriction of operations within the kernel mode, where the system fails to properly validate memory management operations that could lead to arbitrary code execution or system instability. The ATT&CK framework categorizes this under T1499.004 which involves network denial of service attacks targeting operating system services, specifically focusing on kernel-level vulnerabilities that can compromise system availability.
The technical implementation of this vulnerability occurs when a maliciously crafted kernel mode request is sent to the Windows kernel through the VAD cloning functionality. The kernel's memory management subsystem fails to properly validate the parameters of these requests, allowing an attacker to manipulate the virtual address descriptor structures in ways that cause memory corruption. This manipulation results in the kernel attempting to perform operations on invalid memory regions or corrupted data structures, ultimately leading to system instability. The vulnerability specifically exploits the way Windows handles virtual address descriptor cloning operations during memory management processes, where the system does not adequately verify the legitimacy of the cloning parameters provided by the requesting entity. When the kernel processes these malformed requests, it can lead to memory corruption that forces the system to crash or become unresponsive, effectively creating a denial of service condition that prevents legitimate system operations from proceeding.
The operational impact of CVE-2017-8515 extends beyond simple system availability disruption as it represents a fundamental weakness in Windows kernel memory management that can be exploited remotely without authentication. Attackers can leverage this vulnerability to cause persistent system downtime across affected Windows installations, potentially affecting enterprise environments where multiple systems may be compromised simultaneously. The vulnerability's exploitation does not require any user interaction or elevated privileges, making it particularly dangerous as it can be triggered by any network-connected system that has not applied the relevant security patches. Organizations running affected Windows versions are at risk of experiencing service interruptions, reduced productivity, and potential data loss if systems become unresponsive due to the denial of service conditions. The vulnerability's classification under CWE-122 indicates that it represents a classic case of insufficient validation of kernel operations, where the system's protective mechanisms fail to properly validate the integrity of memory management requests.
Mitigation strategies for CVE-2017-8515 primarily focus on applying Microsoft's security updates and patches that address the kernel mode validation issues within the VAD cloning mechanism. Organizations should prioritize immediate deployment of the relevant security patches released by Microsoft as part of their regular update cycles, particularly the cumulative updates that address this specific vulnerability. Network segmentation and firewall rules can provide additional protection by limiting exposure to potentially malicious network traffic that could contain crafted kernel mode requests. System administrators should implement monitoring solutions that can detect unusual memory management patterns or kernel activity that might indicate exploitation attempts. The vulnerability's nature suggests that organizations should also consider implementing endpoint detection and response solutions that can identify anomalous kernel behavior and provide alerts when suspicious memory management operations occur. Additionally, maintaining up-to-date antivirus and anti-malware solutions that can detect and block exploitation attempts remains crucial for comprehensive protection against this vulnerability and similar kernel-level threats.