CVE-2014-0318 in Windows
Summary
by MITRE
win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly control access to thread-owned objects, which allows local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 02/10/2022
The CVE-2014-0318 vulnerability represents a critical privilege escalation flaw within the Windows kernel-mode driver subsystem, specifically targeting the win32k.sys component that manages user interface elements and graphics rendering. This vulnerability exists in multiple Windows operating system versions including server and client platforms, making it particularly dangerous as it affects a broad attack surface. The flaw stems from improper access control mechanisms within the kernel-mode drivers responsible for handling thread-owned objects, which are fundamental components in Windows user interface management and process synchronization. The vulnerability has been classified under CWE-264, which addresses permissions, privileges, and access controls in software systems, specifically focusing on inadequate access control in kernel-mode components.
The technical exploitation of this vulnerability occurs when a local attacker crafts a malicious application that can manipulate thread-owned objects within the win32k.sys driver. This allows the malicious code to escalate privileges from a standard user account to SYSTEM level access, which provides complete control over the affected system. The flaw specifically relates to how the kernel-mode driver handles access validation for objects that are owned by threads, creating a scenario where unauthorized access can occur through improper validation of object ownership. This type of vulnerability falls under the ATT&CK technique T1068, which describes "Exploitation for Privilege Escalation" and specifically targets the Windows kernel for unauthorized access. The vulnerability's exploitation requires local system access but does not need network connectivity, making it particularly insidious as it can be leveraged by attackers who have already established a foothold on a target system.
The operational impact of CVE-2014-0318 is severe and far-reaching, as successful exploitation can result in complete system compromise without requiring additional attack vectors. Once an attacker gains SYSTEM-level privileges through this vulnerability, they can perform any action on the compromised system including installing malware, modifying system files, accessing sensitive data, and establishing persistent access. The vulnerability's presence across multiple Windows versions means that organizations running affected systems are at risk, particularly those with legacy systems that may not have received timely security updates. This vulnerability has been widely exploited in the wild, with various threat actors leveraging it for initial access and privilege escalation in targeted attacks. Organizations that have not applied the relevant security patches for this vulnerability face significant risk of compromise, as the exploitation process is relatively straightforward and does not require advanced technical skills beyond basic application development knowledge.
Mitigation strategies for CVE-2014-0318 primarily focus on immediate patching and system hardening measures. Microsoft released security update MS14-018 that addresses this vulnerability by correcting the access control mechanisms in the win32k.sys driver. Organizations should prioritize applying this patch across all affected systems, particularly those running legacy Windows versions. Additional mitigations include implementing least privilege principles, disabling unnecessary user accounts, and monitoring for suspicious process activity that might indicate exploitation attempts. Network segmentation and monitoring solutions should be configured to detect potential exploitation attempts through abnormal access patterns. Security administrators should also consider implementing application whitelisting policies to prevent the execution of unauthorized applications that might attempt to exploit this vulnerability. The vulnerability's classification under CWE-264 emphasizes the importance of proper access control implementation in kernel-mode components, making it essential for system administrators to understand and implement robust access control measures. This vulnerability demonstrates the critical importance of maintaining current security patches and the potential consequences of delayed patch deployment in enterprise environments.