CVE-2008-6819 in Windows
Summary
by MITRE
win32k.sys in Microsoft Windows Server 2003 and Vista allows local users to cause a denial of service (system crash) via vectors related to CreateWindow, TranslateMessage, and DispatchMessage, possibly a race condition between threads, a different vulnerability than CVE-2008-1084. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 08/11/2021
The vulnerability identified as CVE-2008-6819 resides within the win32k.sys kernel driver component of Microsoft Windows Server 2003 and Windows Vista operating systems. This kernel-level driver serves as a critical interface between user-mode applications and the Windows graphical subsystem, handling essential functions including window management, message processing, and input handling operations. The flaw specifically manifests during the processing of window creation and message dispatching operations, making it particularly dangerous as it can be exploited through normal system usage patterns.
The technical implementation of this vulnerability involves improper handling of synchronization mechanisms within the win32k.sys driver during the execution of CreateWindow, TranslateMessage, and DispatchMessage functions. The vulnerability appears to stem from a race condition scenario between multiple threads competing for access to shared resources within the kernel space. When local users execute specific sequences of window management operations, the driver fails to properly coordinate thread execution, leading to memory corruption and subsequent system instability. This race condition occurs at the kernel level where multiple threads attempt to manipulate the same data structures simultaneously without adequate synchronization primitives.
The operational impact of CVE-2008-6819 represents a significant denial of service vulnerability that can be exploited by local attackers to crash the entire Windows operating system. Since the vulnerability operates within the kernel space, successful exploitation results in a system crash that typically manifests as a blue screen of death or complete system hang. The vulnerability is particularly concerning because it requires no elevated privileges to exploit, making local users with standard accounts capable of causing system-wide disruption. This characteristic places it in the category of local privilege escalation vulnerabilities that can be leveraged for broader attack scenarios.
From a cybersecurity perspective, this vulnerability aligns with CWE-362, which describes race conditions in concurrent programming environments, and relates to the broader class of kernel-level vulnerabilities that can be exploited for system compromise. The ATT&CK framework categorizes this type of vulnerability under the T1068 technique for 'Exploitation for Privilege Escalation' and T1499 under 'Endpoint Denial of Service' for system disruption. The vulnerability's exploitation pattern suggests it could serve as a foundational element for more sophisticated attacks, potentially enabling attackers to establish persistent access through subsequent exploitation attempts.
Mitigation strategies for CVE-2008-6819 primarily focus on implementing proper system updates and patches provided by Microsoft. Organizations should prioritize deployment of the relevant security updates that address the kernel synchronization issues within win32k.sys. Additionally, system administrators should consider implementing application whitelisting policies to limit the execution of potentially malicious applications that might exploit this vulnerability. Network segmentation and privilege separation techniques can help reduce the attack surface, while monitoring solutions should be configured to detect unusual system crash patterns that might indicate exploitation attempts. The vulnerability also underscores the importance of maintaining current security patches and conducting regular vulnerability assessments to identify similar synchronization issues in other kernel components.