CVE-2011-1881 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 CVEs listed in MS11-054, aka "Win32k Null Pointer De-reference Vulnerability."
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Analysis
by VulDB Data Team • 10/17/2024
The vulnerability identified as CVE-2011-1881 represents a critical privilege escalation flaw within the Windows kernel-mode driver component known as win32k.sys. This vulnerability affects multiple versions of the Windows operating system including Windows xp service pack 2 and 3, windows server 2003 service pack 2, windows vista service pack 1 and 2, windows server 2008 in various service pack configurations, and windows 7 in both gold and service pack 1 versions. The flaw resides in the kernel-mode drivers that handle graphical user interface operations and system calls related to window management and user interface rendering.
The technical nature of this vulnerability stems from a NULL pointer dereference condition within the win32k.sys driver. When a specially crafted application executes and triggers this specific code path, it causes the driver to attempt to access a null memory pointer, resulting in system instability and potential privilege escalation. This type of vulnerability falls under the common weakness enumeration category CWE-476 which specifically addresses NULL pointer dereference conditions. The vulnerability operates at the kernel level where it can bypass normal security restrictions and potentially elevate a local user's privileges to system level access.
The operational impact of CVE-2011-1881 is significant as it allows local attackers who already have user-level access to the system to escalate their privileges without requiring additional authentication or remote access capabilities. This makes it particularly dangerous in environments where users may have legitimate access to systems but could potentially abuse this vulnerability to gain unauthorized administrative control. The vulnerability's classification as a privilege escalation issue aligns with attack techniques described in the attack tree framework where local users can leverage kernel-level flaws to achieve system compromise. The fact that this vulnerability is distinct from other CVEs listed in MS11-054 indicates it represents a separate code path and exploitation method that requires specific targeting and understanding of the win32k.sys driver behavior.
Mitigation strategies for this vulnerability primarily involve applying the official security updates released by microsoft as part of the ms11-054 patch cycle. Organizations should prioritize immediate deployment of these patches across all affected systems to eliminate the risk of exploitation. Additionally, system administrators should consider implementing additional security measures such as disabling unnecessary user access to potentially vulnerable applications and monitoring for suspicious system behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of kernel-mode security and highlights how flaws in core system drivers can provide attackers with powerful escalation capabilities that bypass traditional user-mode security controls. Organizations should also implement proper system hardening practices and maintain updated security monitoring solutions to detect potential exploitation attempts targeting this type of kernel vulnerability.