CVE-2018-8308 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows kernel fails to properly handle objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 04/05/2023
The vulnerability described in CVE-2018-8308 represents a critical elevation of privilege flaw within the Windows kernel operating system components. This issue stems from improper handling of memory objects by the kernel, creating a pathway for malicious actors to escalate their privileges from standard user level to administrative rights. The vulnerability affects multiple Windows operating system versions including legacy systems like Windows 7 and Windows Server 2008, as well as newer releases such as Windows 10 and Windows Server 2016, indicating a widespread impact across the Windows ecosystem. The flaw specifically resides in the kernel's memory management routines where it fails to validate or properly process certain kernel objects, creating potential exploitation opportunities for attackers who can manipulate these memory structures.
From a technical perspective, this vulnerability operates as a classic kernel-level privilege escalation flaw that falls under CWE-119, which describes weaknesses related to improper handling of memory objects. The kernel's failure to properly validate memory objects during processing creates a condition where malicious code can manipulate kernel data structures to gain elevated privileges. Attackers can exploit this by crafting specific memory operations that trigger the flawed kernel handling code path, potentially allowing them to execute arbitrary code with SYSTEM-level privileges. The vulnerability's nature suggests it involves improper bounds checking or memory validation during kernel object manipulation, which aligns with common patterns seen in kernel exploitation techniques. This type of vulnerability is particularly dangerous because it operates at the core of the operating system's security model where all other security mechanisms depend on proper kernel operation.
The operational impact of CVE-2018-8308 extends beyond simple privilege escalation, as it fundamentally undermines the security boundaries that protect Windows systems. Once exploited, attackers can gain complete control over affected systems, potentially leading to data theft, system compromise, or use of compromised machines as launching points for further attacks. The vulnerability's presence across multiple Windows versions means that organizations maintaining legacy systems face significant risk, as these older platforms often receive extended support but may not have all security updates applied. From an adversary perspective, this vulnerability provides a reliable method for gaining administrative access without requiring additional attack vectors, making it particularly attractive for threat actors conducting targeted attacks against enterprise networks. The exploitation of such vulnerabilities typically follows ATT&CK technique T1068, which involves exploiting weaknesses in the Windows kernel to gain elevated privileges.
Mitigation strategies for CVE-2018-8308 primarily involve applying the Microsoft security updates released in August 2018 as part of the Windows security bulletin MS18-082. Organizations should prioritize immediate deployment of these patches across all affected systems, particularly those running older Windows versions that may not have received timely updates. System administrators should also implement additional security controls including kernel-mode driver validation, enhanced monitoring of kernel object manipulation, and network segmentation to limit the potential impact of successful exploitation. The vulnerability demonstrates the importance of maintaining up-to-date security patches and highlights the risks associated with running unsupported operating system versions. Organizations should also consider implementing exploit prevention technologies such as Control Flow Guard and Address Space Layout Randomization to make exploitation more difficult even if patches are not immediately deployed. Regular security assessments and vulnerability scanning should be conducted to identify systems that may be running vulnerable versions of Windows and require immediate remediation.