CVE-2018-8170 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows kernel image handles objects in memory, aka "Windows Image Elevation of Privilege Vulnerability." This affects Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 08/17/2024
The Windows Image Elevation of Privilege Vulnerability represents a critical security flaw within the Windows kernel's handling of memory objects, specifically affecting Windows 10 and Windows 10 Server operating systems. This vulnerability falls under the CWE-264 category of "Permissions, Privileges, and Access Controls" and aligns with ATT&CK technique T1068 which targets local privilege escalation. The flaw exists in the kernel-mode component responsible for processing image files, creating a pathway for malicious actors to elevate their privileges from standard user level to SYSTEM level access.
The technical implementation of this vulnerability stems from improper validation of image object structures within kernel memory. When Windows processes image files, particularly those with malformed or crafted headers, the kernel fails to properly validate the memory references and object boundaries. This inadequate validation allows attackers to manipulate memory pointers and object references in ways that bypass normal access controls and privilege checks. The vulnerability specifically manifests when the kernel attempts to process certain image file formats, creating a condition where memory corruption can occur and be exploited to gain elevated privileges.
The operational impact of this vulnerability is severe and far-reaching within enterprise environments. An attacker with local user access can exploit this weakness to escalate privileges without requiring additional authentication or complex attack vectors. Once elevated to SYSTEM level, the malicious user gains complete control over the affected system, enabling them to access all files, modify system configurations, install malicious software, and potentially establish persistent backdoors. The vulnerability's exploitation does not require specialized tools or extensive knowledge, making it particularly dangerous in environments where local access is common. This weakness can be leveraged in various attack scenarios including insider threats, compromised user accounts, or initial access points where attackers have already established a foothold on a target system.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches released in the August 2018 security updates. Organizations must ensure comprehensive patch management processes are in place to maintain up-to-date systems and prevent exploitation of known vulnerabilities. Additionally, implementing principle of least privilege controls, disabling unnecessary user accounts, and monitoring for suspicious privilege escalation attempts can help reduce the attack surface. Network segmentation and monitoring solutions should be configured to detect anomalous behavior patterns that may indicate exploitation attempts. The vulnerability's classification as a kernel-level privilege escalation issue makes it particularly important to maintain robust system integrity checks and regular security assessments to identify potential exploitation attempts before they can be successfully executed.