CVE-2013-3879 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 and R2 SP1, Windows 7 SP1, Windows 8, Windows Server 2012, and Windows RT 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 • 05/26/2021
The CVE-2013-3879 vulnerability represents a critical use-after-free flaw in the win32k.sys kernel-mode driver component of Microsoft Windows operating systems. This vulnerability affects a broad range of Microsoft Windows versions including legacy systems like Windows xp sp2 and sp3, windows server 2003 sp2, and newer releases such as windows 7 sp1, windows 8, and windows server 2012. The flaw resides in the kernel-mode drivers responsible for handling user interface components and graphics operations, specifically within the win32k.sys file that manages windowing system functionality. This type of vulnerability falls under the common weakness enumeration category CWE-416, which specifically addresses use-after-free conditions where memory is accessed after it has been freed, creating potential for arbitrary code execution.
The technical exploitation of this vulnerability occurs when a malicious application triggers a specific sequence that causes the win32k.sys driver to free memory resources while other processes or threads may still reference them. Attackers can craft applications that manipulate the graphics subsystem to force the kernel driver into an inconsistent state where freed memory is accessed, leading to potential privilege escalation. The vulnerability is particularly dangerous because it operates at kernel level, meaning successful exploitation can result in full system compromise with elevated privileges. According to the attack tree framework, this represents a local privilege escalation vector that can be leveraged by attackers who have already gained a foothold on a target system through other means.
The operational impact of CVE-2013-3879 extends beyond simple privilege escalation as it provides attackers with complete control over affected systems. Once exploited, adversaries can execute arbitrary code with kernel-level privileges, potentially allowing them to install persistent backdoors, modify system files, disable security features, or extract sensitive data from the compromised machine. The vulnerability's presence across multiple windows versions makes it particularly concerning for organizations with mixed legacy and modern infrastructure. Security researchers have noted that this flaw can be particularly challenging to detect and remediate due to its kernel-level nature and the complex interactions between graphics drivers and system memory management. The attack surface is further expanded by the fact that legitimate applications that interact with the graphics subsystem can inadvertently trigger the vulnerable code path.
Mitigation strategies for CVE-2013-3879 require immediate implementation of microsoft security patches and updates, as the vendor released specific fixes for all affected windows versions. Organizations should prioritize patch management processes to ensure all systems are updated promptly, as this vulnerability has been actively exploited in the wild. Additional defensive measures include implementing application whitelisting policies to restrict execution of unauthorized applications that might trigger the vulnerability, enabling exploit protection features such as data execution prevention, and monitoring for suspicious graphics-related system calls. Network segmentation and privilege separation can also help limit the potential impact if exploitation occurs. Security teams should also consider deploying endpoint detection and response solutions that can identify anomalous behavior patterns consistent with exploitation attempts, as traditional signature-based detection may not be sufficient to catch all variants of this kernel-level exploit. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and the inherent risks associated with kernel-mode vulnerabilities in operating system components.