CVE-2009-2513 in Windows
Summary
by MITRE
The Graphics Device Interface (GDI) in win32k.sys in the kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 does not properly validate user-mode input, which allows local users to gain privileges via a crafted application, aka "Win32k Insufficient Data Validation Vulnerability."
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Analysis
by VulDB Data Team • 08/27/2021
The CVE-2009-2513 vulnerability represents a critical privilege escalation flaw within the Windows kernel-mode graphics subsystem, specifically affecting the win32k.sys driver component that manages the Graphics Device Interface. This vulnerability stems from insufficient data validation mechanisms in the kernel-mode GDI implementation, creating a pathway for local attackers to execute arbitrary code with elevated privileges. The flaw exists across multiple Windows versions including Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold through SP2, and Server 2008 Gold through SP2, making it one of the most widespread kernel-mode vulnerabilities of its time. The vulnerability is classified under CWE-125 as an out-of-bounds read condition and aligns with ATT&CK technique T1068 which describes privilege escalation through kernel exploits.
The technical exploitation of this vulnerability occurs when a malicious application attempts to manipulate user-mode input data that gets processed by the kernel-mode win32k.sys driver. During the validation process, the driver fails to properly sanitize input parameters, particularly those related to graphics operations such as GDI object manipulation and window management functions. When legitimate user-mode applications pass malformed or oversized parameters to kernel-mode functions, the insufficient validation allows attackers to corrupt kernel memory structures and potentially execute arbitrary code with SYSTEM privileges. The vulnerability specifically targets the boundary checking mechanisms within kernel-mode graphics functions, where the driver does not adequately verify the size or content of user-provided data before processing it.
The operational impact of CVE-2009-2513 is severe as it provides local attackers with complete system compromise capabilities without requiring network access or user interaction. Once exploited, the vulnerability enables attackers to gain kernel-level privileges, allowing them to bypass all Windows security controls including user access control, file system protections, and registry security settings. The exploit typically requires a local login session and can be delivered through a specially crafted application that triggers the vulnerable kernel function. Attackers can leverage this privilege escalation to install rootkits, modify system files, disable security software, and establish persistent backdoors on compromised systems. The vulnerability's widespread presence across multiple Windows versions makes it particularly dangerous as it affects both desktop and server operating systems, potentially allowing attackers to compromise entire network infrastructures.
Mitigation strategies for CVE-2009-2513 primarily focus on applying the official Microsoft security patches released as part of the Microsoft Security Bulletin MS09-032. Organizations should prioritize immediate patch deployment across all affected systems to eliminate the vulnerability at its source. Additionally, system administrators should implement the principle of least privilege by limiting user accounts to standard permissions and avoiding administrative access for routine tasks. The Windows security configuration should include disabling unnecessary graphics services and applying security policies that restrict user-mode applications from performing privileged operations. Network segmentation and monitoring solutions should be deployed to detect anomalous behavior that might indicate exploitation attempts. System hardening measures such as disabling the Windows Script Host and implementing application whitelisting can further reduce the attack surface. From a defensive perspective, the vulnerability highlights the importance of kernel-mode security validation and proper input sanitization techniques, aligning with security frameworks that emphasize the need for robust data validation at all system boundaries. Organizations should also consider implementing endpoint detection and response solutions that can identify the specific exploitation patterns associated with this vulnerability.