CVE-2011-2018 in Windows
Summary
by MITRE
The kernel in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, and Windows 7 Gold and SP1 does not properly initialize objects, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Exception Handler Vulnerability."
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2011-2018 represents a critical flaw in the Windows kernel's object initialization process that affects multiple operating system versions including Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, and Windows 7 Gold and SP1. This issue stems from improper handling of kernel objects during their creation and initialization phases, creating a privilege escalation opportunity for local attackers who can craft malicious applications to exploit the weakness. The vulnerability specifically relates to how the kernel manages exception handling mechanisms, where insufficient validation or initialization of kernel objects allows attackers to manipulate memory structures and potentially execute arbitrary code with elevated privileges. This flaw operates at the core of the operating system's security model and represents a fundamental breakdown in the kernel's ability to properly manage system resources and maintain security boundaries.
The technical exploitation of this vulnerability occurs when a local user executes a crafted application that triggers the kernel's exception handling routine with malformed or improperly initialized object parameters. According to CWE-119, this vulnerability falls under the category of "Improper Restriction of Operations within the Bounds of a Memory Buffer" and aligns with ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation." The kernel's failure to properly initialize objects creates a condition where memory corruption can occur during exception handling, potentially allowing attackers to overwrite critical kernel structures or manipulate object pointers. The vulnerability is particularly dangerous because it operates within the kernel space where any successful exploitation immediately grants the attacker the highest possible privileges, effectively bypassing all user-mode security controls and access restrictions.
From an operational impact perspective, this vulnerability represents a severe threat to system integrity and security posture across affected Windows deployments. Local privilege escalation attacks exploiting this flaw can result in complete system compromise, allowing attackers to establish persistent access, install backdoors, modify system files, or extract sensitive information from the compromised systems. The widespread availability of this vulnerability across multiple Windows versions means that organizations running any of the affected operating systems face significant risk, particularly in environments where local user access is not properly restricted or where users may be tricked into executing malicious code. The vulnerability's exploitation typically requires local access to the target system, making it particularly concerning for environments where physical access or social engineering attacks could provide attackers with the necessary conditions for exploitation.
Organizations should implement immediate mitigations including deploying Microsoft security updates that address the kernel object initialization flaw and ensuring all affected systems are patched promptly. The recommended approach includes applying the relevant security patches from Microsoft's monthly security bulletin releases and implementing additional security measures such as enabling kernel address space layout randomization (KASLR), disabling unnecessary services, and implementing strict access controls to limit local user privileges. Network segmentation and monitoring solutions should be deployed to detect potential exploitation attempts, while security awareness training should be provided to reduce the risk of social engineering attacks that might deliver malicious payloads. According to NIST guidelines and the ATT&CK framework, organizations should also maintain comprehensive logging of system calls and kernel activities to detect anomalous behavior that might indicate exploitation attempts, and consider implementing additional defense-in-depth measures such as application whitelisting and mandatory access controls to further reduce the attack surface and limit potential damage from successful exploitation.