CVE-2018-8343 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the Network Driver Interface Specification (NDIS) when ndis.sys fails to check the length of a buffer prior to copying memory to it, aka "Windows NDIS Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8342.
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Analysis
by VulDB Data Team • 05/01/2023
The vulnerability described in CVE-2018-8343 represents a critical elevation of privilege flaw within the Windows Network Driver Interface Specification (NDIS) component. This issue resides in the ndis.sys kernel driver which serves as the foundational interface between network drivers and the Windows operating system. The vulnerability stems from inadequate input validation during memory operations, specifically when the driver fails to properly validate buffer lengths before executing memory copy operations. This fundamental flaw allows malicious actors to potentially execute arbitrary code with elevated privileges, bypassing normal security boundaries that typically protect the kernel space from user-mode applications. The vulnerability affects multiple Windows operating systems including legacy versions like Windows 7 and Server 2008 R2 alongside newer releases such as Windows 10 and Server 2016, making it particularly dangerous due to its widespread impact across the Windows ecosystem.
From a technical perspective, this vulnerability manifests as a classic buffer overflow condition classified under CWE-129, which represents an insufficient check for a buffer's length prior to copying data into it. The flaw occurs within the NDIS subsystem where network driver communication is processed, specifically when handling user-supplied data structures that are passed to kernel-mode components. The vulnerability is particularly concerning because it operates at the kernel level where memory operations are executed with the highest privileges, allowing attackers to manipulate system memory and potentially gain complete control over affected systems. Attackers can exploit this by crafting malicious network packets or driver interactions that trigger the flawed memory copy operation, causing the system to overwrite memory regions with attacker-controlled data. This type of vulnerability aligns with ATT&CK technique T1068 which describes 'Exploitation for Privilege Escalation' and specifically targets kernel-mode exploitation pathways that bypass standard security controls.
The operational impact of CVE-2018-8343 extends far beyond simple privilege escalation, as it provides attackers with a powerful foothold for further system compromise. Once successfully exploited, an attacker can gain kernel-level access which enables complete system control including the ability to install malware, modify system files, disable security features, and access all user data. The vulnerability's presence in both client and server operating systems creates significant risk for enterprise environments where Windows servers are commonly targeted for privilege escalation attacks. Network administrators face particular challenges as this vulnerability can be exploited remotely through network-based attacks, making it a prime target for advanced persistent threat actors. The fact that this vulnerability affects multiple Windows versions including long-term support releases means that organizations with legacy systems are particularly at risk, as these systems may not receive timely updates or patches. Security professionals must consider this vulnerability as part of broader attack surface management strategies, particularly in environments where network access is not properly segmented or where outdated systems remain operational. The vulnerability's classification as an elevation of privilege issue places it within the critical severity category, as it directly enables attackers to bypass fundamental operating system security mechanisms and assume complete administrative control over affected systems.
Mitigation strategies for CVE-2018-8343 primarily focus on applying Microsoft security updates which address the underlying buffer validation flaw in the ndis.sys driver. Organizations should prioritize patch management and ensure all affected Windows systems receive the appropriate cumulative updates released by Microsoft. Additionally, network segmentation and firewall rules can help limit the attack surface by restricting network access to systems potentially vulnerable to this exploit. System administrators should implement monitoring solutions that detect anomalous network traffic patterns or kernel-mode activity that might indicate exploitation attempts. The vulnerability's nature suggests that runtime protections such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) may provide partial defense, though these protections are not sufficient to prevent exploitation entirely. Organizations should also consider implementing network-based intrusion detection systems that can identify and block malicious network traffic patterns associated with this vulnerability. Regular security assessments and vulnerability scanning should include checks for systems running affected Windows versions to ensure timely patching and reduce the window of exposure. The remediation process should also include thorough testing of patches in controlled environments to prevent potential compatibility issues with existing network driver configurations or applications that depend on the NDIS interface.