CVE-2011-1880 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 • 11/14/2021
The vulnerability described in CVE-2011-1880 represents a critical privilege escalation flaw within the Windows kernel-mode driver subsystem, specifically affecting the win32k.sys component that handles user interface functions and graphics operations. This vulnerability exists in multiple Windows operating system versions 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 as a NULL pointer dereference condition that occurs when a malicious application triggers specific kernel-mode operations through the win32k.sys driver, which is responsible for managing windowing system components and graphics rendering functions.
The technical exploitation of this vulnerability involves a local attacker who crafts a malicious application designed to interact with the kernel-mode win32k.sys driver in a manner that causes it to attempt to dereference a NULL pointer. This type of flaw falls under the Common Weakness Enumeration category CWE-476 which specifically addresses NULL pointer dereference vulnerabilities, where the program attempts to access memory through a pointer that has not been properly initialized or validated. The vulnerability is particularly dangerous because it allows local users to escalate their privileges from standard user level to SYSTEM level access, which provides complete control over the affected system. The exploitation occurs within the kernel context where the privilege levels are highest, making this a severe security issue that can be leveraged for complete system compromise.
The operational impact of this vulnerability extends far beyond simple privilege escalation as it provides attackers with the ability to execute arbitrary code with the highest system privileges, effectively bypassing all standard user access controls and security boundaries. Once an attacker achieves SYSTEM-level access through this vulnerability, they can modify system files, install malware, create new user accounts, disable security features, and access all data stored on the system. The vulnerability's persistence across multiple Windows versions indicates a fundamental flaw in the kernel-mode driver architecture that was not adequately addressed through standard security updates. This type of vulnerability is particularly concerning from an ATT&CK framework perspective as it maps to the privilege escalation technique T1068, where adversaries leverage system-level flaws to gain elevated privileges. The vulnerability's classification as a kernel-mode NULL pointer dereference also aligns with the broader category of kernel exploits that are often targeted in advanced persistent threat campaigns.
Mitigation strategies for this vulnerability must include immediate deployment of Microsoft security patches as released in MS11-054, which specifically addressed this flaw through kernel-mode driver modifications that properly validate pointer references. Organizations should implement comprehensive patch management procedures that prioritize critical security updates, particularly those addressing kernel-mode vulnerabilities that can be exploited locally. Additional mitigations include implementing least privilege principles where user accounts operate with minimal necessary permissions, disabling unnecessary services and applications that might interact with vulnerable kernel components, and employing runtime protection mechanisms such as DEP (Data Execution Prevention) and ASLR (Address Space Layout Randomization). System administrators should also monitor for suspicious process activity and implement behavioral analysis tools that can detect anomalous interactions with kernel-mode components, as the exploitation of this vulnerability typically involves specific patterns of system calls that can be flagged by security monitoring systems. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and the potential consequences of delayed patch deployment in enterprise environments.