CVE-2018-8142 in Windows
Summary
by MITRE
A security feature bypass exists when Windows incorrectly validates kernel driver signatures, aka "Windows Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-1035.
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Analysis
by VulDB Data Team • 02/07/2020
The vulnerability identified as CVE-2018-8142 represents a critical security feature bypass in Microsoft Windows operating systems that fundamentally undermines kernel-level protection mechanisms. This flaw specifically targets the kernel driver signature validation process, which serves as a cornerstone of Windows kernel-mode security architecture. The vulnerability affects multiple Windows versions including Windows Server 2016, Windows 10, and Windows 10 Servers, making it particularly concerning given the widespread deployment of these operating systems across enterprise environments. The issue stems from improper validation of kernel driver signatures, which allows malicious actors to bypass the intended security controls that should prevent unsigned or improperly signed drivers from loading in kernel space.
The technical implementation of this vulnerability resides in the Windows kernel's driver signature enforcement mechanism, which is designed to prevent unauthorized driver code from executing with kernel privileges. When Windows validates kernel driver signatures, it should enforce strict cryptographic verification to ensure driver integrity and authenticity. However, CVE-2018-8142 enables attackers to exploit a flaw in this validation process, potentially allowing the loading of malicious drivers that would otherwise be blocked by the operating system's security policies. This bypass occurs at the kernel level, meaning that successful exploitation could grant attackers complete control over the system's core functions, including the ability to manipulate system memory, access protected data, and potentially escalate privileges to SYSTEM level access. The vulnerability's classification aligns with CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on inadequate enforcement of access control mechanisms.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it fundamentally compromises the security posture of affected systems. Attackers who successfully exploit this vulnerability can deploy rootkits, malware, or other malicious code that operates at kernel level, making detection and removal extremely difficult. The implications are particularly severe in enterprise environments where Windows Server 2016 and Windows 10 systems are prevalent, as these platforms often host critical business applications and sensitive data. The vulnerability enables attackers to bypass security controls that are typically enforced by Windows Defender Application Control, Code Integrity policies, and other kernel-mode protection mechanisms. This weakness creates a persistent threat vector that could be exploited by advanced persistent threat actors, nation-state attackers, or sophisticated malware authors who seek to establish long-term footholds within target networks. The vulnerability's presence in Windows 10 Servers makes it especially concerning for cloud infrastructure and server environments where kernel-level security is paramount.
Mitigation strategies for CVE-2018-8142 should focus on immediate patch deployment and enhanced monitoring of kernel-level activities. Microsoft released security updates that address this vulnerability by correcting the kernel driver signature validation process, and system administrators should prioritize applying these patches across all affected systems. Organizations should also implement enhanced monitoring for suspicious driver loading activities, particularly focusing on drivers with unusual signatures or those attempting to load outside of normal system operations. The mitigation approach aligns with ATT&CK technique T1543.003, which covers 'Create or Modify System Process: Windows Service,' as attackers may attempt to establish persistence through modified kernel drivers. Additional defensive measures include enabling Windows Defender Application Control, implementing code integrity policies, and conducting regular security audits of kernel modules. System administrators should also consider implementing network-based monitoring solutions that can detect anomalous behavior indicative of kernel-level compromise, as traditional endpoint protection may not detect malicious driver activities that bypass signature validation checks. The vulnerability's remediation requires careful consideration of compatibility issues, particularly in enterprise environments where custom or legacy drivers may be present.