CVE-2012-2527 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 • 12/31/2024
The CVE-2012-2527 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 windowing subsystem that manages graphical user interface elements and system resources, making it a prime target for privilege escalation attacks. The affected systems include Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 with their respective service packs, and Windows 7 Gold and SP1 versions. The vulnerability stems from improper memory management within the kernel-mode driver that handles windowing operations, creating a scenario where freed memory locations can be accessed and manipulated by malicious code.
The technical exploitation of this vulnerability occurs through a crafted application that triggers a specific sequence of operations within the win32k.sys driver. When a vulnerable system processes certain windowing operations, the driver allocates memory for window objects and subsequently frees that memory. However, due to inadequate validation and memory management controls, an attacker can manipulate the system to access this freed memory before it is properly deallocated. This use-after-free condition creates a memory corruption vulnerability that can be leveraged to execute arbitrary code with kernel-level privileges. The flaw specifically affects the handling of window objects and their associated resources within the kernel-mode environment, where the security boundaries between user-mode and kernel-mode processes become compromised.
The operational impact of CVE-2012-2527 is severe and far-reaching, as it allows local attackers to escalate privileges from standard user accounts to SYSTEM level access without requiring remote network connectivity. This privilege escalation capability enables attackers to bypass traditional security controls, gain full system control, and potentially establish persistent access to compromised systems. The vulnerability affects multiple Windows versions simultaneously, creating a widespread attack surface that impacts organizations across various sectors. Security researchers have classified this vulnerability as a high-severity issue due to its local exploitation nature, which means that attackers do not require network access or complex attack vectors to exploit the flaw. The impact extends beyond individual system compromise to potential lateral movement within networks and the ability to establish backdoors for continued access.
Mitigation strategies for CVE-2012-2527 primarily focus on applying Microsoft security updates and implementing system hardening measures. The most effective solution involves installing the security patches released by Microsoft as part of their regular update cycle, which address the underlying memory management issues in win32k.sys. Organizations should prioritize patch deployment across all affected systems and implement automated patch management solutions to ensure comprehensive coverage. Additional protective measures include implementing application whitelisting policies, disabling unnecessary Windows features, and applying the principle of least privilege to limit user account permissions. From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1068 for locally executed malicious code and T1059 for privilege escalation through kernel-mode exploitation. The vulnerability also relates to CWE-416 which describes the use of freed memory condition, and represents a classic example of kernel-mode privilege escalation through memory corruption vulnerabilities. System administrators should also consider implementing behavioral monitoring and anomaly detection systems to identify potential exploitation attempts and establish incident response procedures tailored to handle kernel-mode exploits.