CVE-2011-1234 in Windows
Summary
by MITRE
Use-after-free vulnerability in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows local users to gain privileges via a crafted application that leverages incorrect driver object management, a different vulnerability than other "Vulnerability Type 1" CVEs listed in MS11-034, aka "Win32k Use After Free Vulnerability."
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Analysis
by VulDB Data Team • 03/20/2025
The CVE-2011-1234 vulnerability represents a critical use-after-free flaw in the win32k.sys kernel-mode driver component of Microsoft Windows operating systems. This vulnerability specifically affects Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, as well as Windows 7 Gold and SP1. The flaw resides in the kernel-mode driver object management system where improper handling of driver objects leads to memory management inconsistencies that can be exploited by malicious actors. This vulnerability is classified under CWE-416 as a use-after-free condition, which occurs when a program continues to reference memory after it has been freed, creating potential for arbitrary code execution or privilege escalation.
The technical exploitation of this vulnerability requires local user access to craft a malicious application that can trigger the improper driver object management within win32k.sys. The kernel-mode nature of the flaw means that successful exploitation can result in privilege escalation from standard user context to kernel-level privileges, effectively allowing attackers to gain complete control over the affected system. The vulnerability operates through incorrect management of driver objects in the Windows kernel, specifically targeting the win32k.sys component which handles user interface functions including window management, graphics rendering, and input processing. This particular vulnerability differs from other "Vulnerability Type 1" CVEs referenced in MS11-034, indicating it follows a distinct exploitation pattern or attack vector.
From an operational impact perspective, this vulnerability presents a severe security risk as it allows local attackers to elevate their privileges without requiring network access or complex attack vectors. The exploitation process typically involves crafting a malicious application that can manipulate the win32k.sys driver's object management routines to trigger the use-after-free condition. Once successfully exploited, attackers can execute arbitrary code with kernel-level privileges, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects multiple Windows versions simultaneously, making it particularly dangerous as it could impact a wide range of systems across different environments. This vulnerability aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' and specifically targets kernel-mode exploitation pathways.
Mitigation strategies for CVE-2011-1234 primarily involve applying the relevant Microsoft security updates released as part of MS11-034, which address the underlying use-after-free condition in win32k.sys. Organizations should prioritize patch management and ensure all affected systems receive the necessary security updates promptly. Additional defensive measures include implementing application whitelisting policies to prevent unauthorized applications from running, monitoring for suspicious process behavior related to win32k.sys, and maintaining up-to-date endpoint protection solutions. System administrators should also consider implementing the principle of least privilege, limiting user access rights to reduce potential impact if exploitation occurs. The vulnerability demonstrates the importance of kernel-mode security and proper memory management practices in operating system design, as it highlights how flaws in core system components can lead to complete system compromise through privilege escalation attacks.