CVE-2017-8468 in Windows
Summary
by MITRE
Microsoft Windows 8.1 and Windows RT 8.1, Windows Server 2012 R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow an attacker to run processes in an elevated context when the Windows kernel improperly handles objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This CVE ID is unique from CVE-2017-8465.
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Analysis
by VulDB Data Team • 08/20/2024
The CVE-2017-8468 vulnerability represents a critical elevation of privilege flaw within Microsoft Windows operating systems that affects multiple versions including Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 10 versions 1511, 1607, and 1703, as well as Windows Server 2016. This vulnerability resides in the Windows kernel's handling of objects in memory, specifically within the win32k.sys driver which manages user interface components and system graphics operations. The flaw allows an attacker with limited user privileges to execute processes with elevated system-level permissions, effectively bypassing standard security boundaries that normally prevent unauthorized access to critical system resources.
The technical mechanism behind this vulnerability involves improper validation and handling of kernel objects within the Windows graphics subsystem. When legitimate user-mode applications interact with the kernel through the win32k.sys driver, the system fails to properly validate certain object references, creating a condition where malicious code can manipulate kernel memory structures. This memory handling flaw typically manifests through race conditions or buffer overflows in the kernel's object management routines, allowing attackers to craft specific inputs that cause the kernel to execute arbitrary code with system privileges. The vulnerability is classified as a privilege escalation issue under CWE-264, specifically CWE-264: Permissions, Privileges, and Access Controls, where the flaw enables unauthorized elevation of privileges through improper access control mechanisms.
The operational impact of CVE-2017-8468 is severe as it provides attackers with a pathway to achieve system-level compromise from a standard user account. Once exploited, the vulnerability allows attackers to bypass User Account Control mechanisms, modify system files, install malicious software, and potentially establish persistent backdoors within the target environment. The attack surface is particularly concerning because it can be exploited through various vectors including malicious documents, web-based attacks, or social engineering campaigns that trick users into executing compromised applications. This vulnerability is particularly dangerous in enterprise environments where users may have legitimate access to systems but lack administrative privileges, as it enables lateral movement and privilege escalation without requiring initial administrative access.
Security researchers have documented this vulnerability as part of the broader ATT&CK framework under the privilege escalation technique T1068, which specifically addresses "Exploitation for Privilege Escalation." The vulnerability is often exploited in conjunction with other attack vectors, particularly in targeted attacks where adversaries first gain initial access through phishing or drive-by downloads before leveraging CVE-2017-8468 to establish persistent system-level control. Mitigation strategies include immediate deployment of Microsoft security patches, implementing application whitelisting policies, disabling unnecessary user privileges, and monitoring for suspicious kernel-level activity. Organizations should also consider implementing network segmentation and enhanced endpoint detection capabilities to identify potential exploitation attempts. The vulnerability serves as a critical reminder of the importance of timely patch management and the need for robust kernel security mechanisms that prevent improper object handling in privileged execution contexts.