CVE-2011-1225 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 • 01/18/2025
The vulnerability described in CVE-2011-1225 represents a critical privilege escalation flaw within the Windows kernel-mode driver subsystem, specifically affecting the win32k.sys component that manages user interface elements and graphics rendering. This vulnerability resides in the kernel-mode drivers of multiple Windows operating systems including Windows xp sp2 and sp3, windows server 2003 sp2, windows vista sp1 and sp2, windows server 2008 gold and sp2, windows server 2008 r2 and r2 sp1, and windows 7 gold and sp1. The flaw manifests when a malicious application triggers a null pointer dereference condition within the win32k.sys driver, which operates with elevated privileges and handles critical system functions including window management, graphics rendering, and user input processing.
The technical implementation of this vulnerability involves a null pointer dereference error in the win32k.sys kernel driver, which is classified under cwe-476 as a null pointer dereference. This particular flaw occurs during the processing of user-mode applications that interact with the graphics subsystem through the kernel-mode driver interface. When a crafted application sends specially constructed messages or parameters to the win32k.sys driver, the driver fails to properly validate pointer references, leading to a situation where the system attempts to access a null memory address. This condition results in an invalid memory access that can be exploited to escalate privileges from user-level to kernel-level execution context. The vulnerability differs from other "vulnerability type 2" issues referenced in ms11-034, indicating this represents a distinct code path and exploitation technique.
The operational impact of this privilege escalation vulnerability is severe and far-reaching, as it allows local users to execute arbitrary code with system-level privileges without requiring authentication or administrative access. Attackers can leverage this vulnerability to gain complete control over affected systems, potentially leading to data theft, system compromise, and persistent backdoor access. The exploitation requires only local system access, making it particularly dangerous in environments where users might have limited privileges but still need to run applications. Once successfully exploited, the attacker can bypass standard security controls, modify system files, install malware, and establish persistent access. This vulnerability directly maps to attack techniques described in the attack pattern taxonomy under the privilege escalation category, where attackers seek to elevate their execution context to gain administrative control.
Mitigation strategies for CVE-2011-1225 focus on both immediate remediation and long-term security hardening measures. The primary and most effective mitigation involves applying the security update released as part of microsoft security bulletin ms11-034, which patches the null pointer dereference vulnerability in the win32k.sys driver. System administrators should prioritize deployment of this patch across all affected systems, particularly those running older windows versions that are still in use. Additionally, implementing security best practices such as disabling unnecessary services, applying the principle of least privilege, and maintaining up-to-date antivirus signatures helps reduce the attack surface. The vulnerability also highlights the importance of kernel-mode driver security and proper input validation, which aligns with security frameworks such as the cwe top 25 most dangerous software weaknesses and emphasizes the need for robust memory safety practices in operating system components. Organizations should also consider implementing application whitelisting policies and monitoring for suspicious kernel-mode activity to detect potential exploitation attempts.