CVE-2012-2530 in Windows
Summary
by MITRE
Use-after-free vulnerability in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows local users to gain privileges via a crafted application, aka "Win32k Use After Free Vulnerability."
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Analysis
by VulDB Data Team • 04/19/2021
The CVE-2012-2530 vulnerability represents a critical use-after-free flaw in the win32k.sys kernel-mode driver component of Microsoft Windows operating systems. This vulnerability exists within the Windows kernel-mode subsystem that handles graphical user interface operations, specifically in the win32k.sys driver responsible for managing windowing and graphics operations. The flaw manifests when the driver fails to properly validate memory references, creating opportunities for malicious code to exploit the freed memory locations. This particular vulnerability affects a wide range of Windows versions including Windows xp sp2 and sp3, windows server 2003 sp2, windows vista sp2, windows server 2008 sp2 and r2, and windows 7 gold and sp1, making it particularly dangerous due to its widespread presence across multiple operating system versions. The vulnerability is categorized under cwe-416 as a use-after-free condition, which is a well-known class of memory corruption vulnerabilities that can lead to arbitrary code execution when exploited properly.
The technical exploitation of this vulnerability occurs through a crafted application that manipulates the win32k.sys driver to trigger a use-after-free condition. When a vulnerable system processes certain graphical operations, the driver may free a memory block while still maintaining references to it, allowing a local attacker to potentially overwrite the freed memory with malicious data. The attacker can then manipulate the driver to execute code in kernel mode, bypassing standard user-mode security controls. This privilege escalation attack requires local system access but can elevate privileges from standard user to system level, effectively compromising the entire operating system. The attack vector specifically targets the kernel-mode execution environment where the win32k.sys driver operates, making it particularly dangerous as it operates below the protection boundaries of user-mode applications.
The operational impact of CVE-2012-2530 is severe and multifaceted, as it enables local privilege escalation attacks that can result in complete system compromise. An attacker with local access can leverage this vulnerability to execute arbitrary code with kernel-level privileges, potentially leading to persistent backdoor installation, credential theft, or complete system takeover. The vulnerability's presence across multiple Windows versions means that organizations with legacy systems are particularly at risk, as many enterprises still maintain older operating systems in production environments. This vulnerability directly maps to attack techniques described in the mitre att&ck framework under privilege escalation tactics, specifically targeting the use of kernel-mode exploits to gain administrative privileges. The widespread nature of the affected platforms makes this vulnerability particularly attractive to threat actors, as it provides a reliable path to system compromise across diverse computing environments.
Mitigation strategies for CVE-2012-2530 should focus on immediate patching of affected systems through microsoft security updates, which address the underlying memory management flaw in the win32k.sys driver. Organizations should prioritize patch deployment across all affected windows versions, particularly those that cannot be immediately upgraded to newer operating systems. Additional defensive measures include implementing application whitelisting policies to prevent execution of potentially malicious applications, disabling unnecessary graphical services, and applying security configuration baselines that reduce the attack surface. Network segmentation and monitoring for unusual kernel-mode activity can help detect exploitation attempts, while regular security assessments should verify that systems remain patched and properly configured. The vulnerability also highlights the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments to identify and remediate similar kernel-mode flaws that could provide similar privilege escalation capabilities.