CVE-2012-2553 in Windows
Summary
by MITRE
Use-after-free vulnerability in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, 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-2012-2553 vulnerability represents a critical use-after-free condition within the win32k.sys kernel-mode driver component of Microsoft Windows operating systems. This flaw exists in multiple versions including Windows xp sp3, windows server 2003 sp2, windows vista sp2, windows server 2008 sp2, and windows 7 gold and sp1, making it a widespread concern across the windows ecosystem. The vulnerability stems from improper memory management within the graphics subsystem driver that handles user interface elements and window management functions. The win32k.sys driver is responsible for processing user input, rendering graphics, and managing window objects, making it a prime target for privilege escalation attacks.
The technical implementation of this vulnerability occurs when the win32k.sys driver fails to properly validate or manage memory references during certain graphics operations. Specifically, when a malicious application triggers a sequence of operations that cause a window object to be freed from memory while still being referenced by other components, the system attempts to access memory that has already been deallocated. This creates a use-after-free condition that can be exploited by local attackers who craft specific applications to manipulate the driver's memory management routines. The vulnerability is particularly dangerous because it operates within kernel mode, where the attacker can execute code with the highest privileges available to the system.
The operational impact of CVE-2012-2553 is severe and multifaceted, as it allows local users to escalate their privileges from standard user level to system level access. Attackers who successfully exploit this vulnerability can gain complete control over affected systems, potentially leading to data theft, system compromise, and further network infiltration. The exploitability is relatively straightforward since it requires only local access to the system and does not necessitate network connectivity or complex attack vectors. This makes the vulnerability particularly concerning for environments where local access might be obtained through social engineering, insider threats, or compromised user accounts. The privilege escalation capability directly maps to attack techniques described in the attack tree framework, specifically targeting the privilege escalation and persistence phases of the cyber kill chain.
Mitigation strategies for this vulnerability primarily focus on applying the official microsoft security patches released in response to this flaw, which address the underlying memory management issues in win32k.sys. System administrators should prioritize patch deployment across all affected windows versions, particularly in enterprise environments where the risk of exploitation is higher. Additional protective measures include implementing application whitelisting policies to restrict execution of potentially malicious applications, enabling user access control mechanisms, and monitoring for unusual system behavior that might indicate exploitation attempts. The vulnerability aligns with common weakness enumeration category 461, which deals with improper management of memory resources, and represents a typical example of how kernel-mode vulnerabilities can be leveraged for privilege escalation attacks. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation, as the vulnerability does not require network access for exploitation but can lead to further lateral movement within compromised networks.