CVE-2011-1230 in Windows
Summary
by MITRE
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 triggers a NULL pointer dereference, a different vulnerability than other "Vulnerability Type 2" CVEs listed in MS11-034, aka "Win32k Null Pointer De-reference Vulnerability."
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Analysis
by VulDB Data Team • 03/30/2025
The vulnerability described in CVE-2011-1230 represents a critical privilege escalation flaw within the Windows kernel-mode drivers, specifically in the win32k.sys component that manages user interface elements and graphics operations. This vulnerability affects multiple Windows operating systems including 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 manifests when a crafted application triggers a NULL pointer dereference within the win32k.sys driver, allowing local attackers to elevate their privileges from standard user level to system level execution. This type of vulnerability falls under CWE-476 which specifically addresses NULL pointer dereference conditions that can lead to privilege escalation and system compromise. The vulnerability is distinct from other "Vulnerability Type 2" issues referenced in MS11-034, indicating it represents a separate and unique code path that exploits the kernel-mode graphics subsystem.
The technical exploitation of this vulnerability occurs through the manipulation of kernel-mode driver functions that handle user interface operations and graphics rendering. When a malicious application attempts to interact with the win32k.sys driver in a specific manner, it causes the driver to attempt to dereference a NULL pointer, which results in a system crash or more critically, allows the attacker to execute arbitrary code with elevated privileges. The kernel-mode nature of the vulnerability means that successful exploitation bypasses standard user-mode security controls and directly compromises the operating system's core security mechanisms. This particular flaw demonstrates the inherent risk of kernel-mode driver vulnerabilities where a single memory corruption issue can provide complete system compromise. The vulnerability operates through a well-defined exploitation pattern that involves careful crafting of input parameters to the graphics subsystem, making it particularly dangerous as it can be triggered by seemingly benign applications.
The operational impact of CVE-2011-1230 is severe and far-reaching across enterprise environments, as local privilege escalation vulnerabilities can be leveraged by attackers who have already gained initial access to a system through other means such as phishing attacks or social engineering. Once an attacker successfully exploits this vulnerability, they gain complete control over the compromised system, enabling them to install malware, modify system files, access sensitive data, and potentially use the compromised system as a launch point for lateral movement within a network. The vulnerability's presence across multiple Windows versions means that organizations running any of the affected operating systems are at risk, creating widespread exposure that extends from desktop environments to server infrastructure. This type of vulnerability directly maps to ATT&CK technique T1068 which describes the use of local privilege escalation techniques to gain system-level access. The impact extends beyond individual system compromise to potentially enable broader network infiltration and data exfiltration operations.
Mitigation strategies for CVE-2011-1230 focus primarily on immediate patch deployment through Microsoft security updates, as the vulnerability requires no user interaction for exploitation and can be triggered by any local application. Organizations should prioritize patch management to ensure all affected systems receive the appropriate security updates, particularly since this vulnerability was addressed in Microsoft Security Bulletin MS11-034. Additional mitigations include implementing application whitelisting policies to prevent execution of potentially malicious applications, disabling unnecessary graphics services, and monitoring for suspicious system behavior that might indicate exploitation attempts. Network segmentation and user access controls can help limit the potential damage from successful exploitation, while regular security audits and vulnerability assessments should be conducted to identify systems that may not have received the necessary patches. The vulnerability also highlights the importance of maintaining up-to-date security practices and understanding the attack surface presented by kernel-mode drivers, which can be leveraged through various attack vectors including those categorized under ATT&CK technique T1059 for execution through system services and T1070 for indicator removal.