CVE-2018-8455 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 08/17/2024
The vulnerability identified as CVE-2018-8455 represents a critical elevation of privilege flaw within the Windows kernel component that fundamentally compromises system security boundaries. This issue stems from improper handling of memory objects during kernel operations, creating a pathway for malicious actors to escalate their privileges from standard user level to administrative access. The vulnerability affects multiple Windows operating system versions including Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, and various Windows 10 Server editions, indicating a widespread impact across the Windows ecosystem. The flaw specifically manifests when the kernel processes certain memory objects, allowing unauthorized code execution with elevated privileges that should otherwise be restricted to system-level processes.
The technical nature of this vulnerability aligns with CWE-264, which addresses permissions, privileges, and access controls in software systems. The root cause lies in the kernel's insufficient validation of memory object handling during specific kernel operations, creating a condition where malicious code can manipulate kernel data structures to gain unauthorized access. Attackers can exploit this weakness by crafting specially crafted applications or system calls that trigger the vulnerable code path within the kernel memory management subsystem. The vulnerability operates at the kernel level, making it particularly dangerous as it bypasses standard user-mode security controls and operates within the most privileged execution context of the operating system. This type of flaw typically involves improper memory management or object lifecycle handling that allows for memory corruption or manipulation of kernel data structures.
The operational impact of CVE-2018-8455 extends far beyond simple privilege escalation, as successful exploitation can lead to complete system compromise and persistent backdoor access. Once an attacker achieves elevated privileges through this vulnerability, they can manipulate system files, install malicious software, access sensitive data, and potentially establish persistence mechanisms that survive system reboots. The vulnerability's presence in server environments creates additional risks as attackers can leverage it to gain administrative control over critical infrastructure, potentially leading to data breaches, service disruption, or lateral movement within network environments. From an adversary perspective, this vulnerability maps to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation,' and represents a common attack vector used by threat actors to establish footholds and escalate their access within compromised systems.
Mitigation strategies for CVE-2018-8455 require immediate patch deployment through Microsoft's security updates, as the vulnerability cannot be effectively addressed through configuration changes alone. Organizations should prioritize patching across all affected Windows versions, particularly server environments where the risk of exploitation is highest. Additional defensive measures include implementing least privilege principles, monitoring for unusual privilege escalation attempts, and employing endpoint detection and response solutions that can identify suspicious kernel-level activities. Network segmentation and application whitelisting can help limit the potential impact if exploitation occurs, while regular security audits should verify that systems remain patched and that no unauthorized access has occurred. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how kernel-level flaws can create persistent security risks that require immediate attention and remediation across all affected systems.