CVE-2011-1229 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 CVE-2011-1229 vulnerability represents a critical privilege escalation flaw within the Windows kernel-mode driver subsystem, specifically targeting the win32k.sys component that manages graphical user interface elements and windowing operations. This vulnerability exists in multiple Windows operating systems including 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. The flaw manifests when a local attacker crafts a malicious application that exploits a NULL pointer dereference condition within the kernel-mode driver, allowing unauthorized privilege elevation from standard user level to system level access.
The technical implementation of this vulnerability stems from improper input validation within the win32k.sys kernel driver, which handles window management and graphical operations for the windows operating system. When a crafted application triggers the vulnerable code path, it causes the driver to attempt to dereference a NULL pointer, leading to a system crash or potentially allowing arbitrary code execution with kernel privileges. This type of vulnerability falls under the CWE-476 category of null pointer dereference, which represents a fundamental programming error where code attempts to access memory through a null reference without proper validation. The vulnerability is particularly dangerous because it operates at kernel level, bypassing user-mode security boundaries and providing attackers with complete system control.
The operational impact of CVE-2011-1229 extends beyond simple privilege escalation, as it enables attackers to execute arbitrary code with the highest system privileges available. This capability allows for complete system compromise, data exfiltration, persistence mechanisms installation, and further lateral movement within network environments. Attackers can leverage this vulnerability to establish backdoors, install rootkits, or perform other malicious activities that would otherwise require physical access or prior system compromise. The vulnerability's presence in multiple windows versions makes it particularly attractive to attackers seeking broad exploitation coverage, as it affects both desktop and server operating systems. According to the mitre att&ck framework, this vulnerability maps to the privilege escalation technique T1068, specifically targeting kernel-mode privilege escalation through driver-based attacks.
Mitigation strategies for CVE-2011-1229 should focus on immediate patch application, as microsoft released security update ms11-034 to address this specific vulnerability. Organizations must ensure all affected systems receive the patch promptly, as the vulnerability remains exploitable in unpatched environments. Additionally, implementing additional security measures such as disabling unnecessary graphical services, restricting user privileges, and monitoring for suspicious kernel-mode activity can provide defense-in-depth. System administrators should also consider implementing application whitelisting policies to prevent execution of unauthorized applications that might trigger the vulnerability. The vulnerability highlights the importance of kernel-mode security and demonstrates why maintaining up-to-date system patches is critical for protecting against sophisticated exploitation techniques that target core operating system components.