CVE-2006-5586 in Windows
Summary
by MITRE
The Graphics Rendering Engine in Microsoft Windows 2000 SP4 and XP SP2 allows local users to gain privileges via "invalid application window sizes" in layered application windows, aka the "GDI Invalid Window Size Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 01/16/2025
The vulnerability identified as CVE-2006-5586 represents a critical privilege escalation flaw within Microsoft Windows operating systems, specifically affecting Windows 2000 Service Pack 4 and Windows XP Service Pack 2. This vulnerability resides in the Graphics Device Interface GDI component responsible for managing graphical user interface elements and window rendering operations. The flaw exploits a fundamental weakness in how the system handles layered application windows, creating a pathway for local attackers to elevate their privileges from standard user level to administrative rights. The vulnerability stems from improper validation of application window dimensions and sizing parameters within the graphics rendering subsystem, allowing malicious code to manipulate these values in ways that bypass normal security boundaries.
The technical mechanism behind this vulnerability involves the manipulation of window sizing parameters in layered windows, which are graphical elements that can overlap and interact with each other in complex ways. When applications create layered windows with invalid or malformed size specifications, the Graphics Device Interface fails to properly validate these parameters before processing them within the kernel space. This validation failure creates a memory corruption scenario where attacker-controlled data can influence the execution flow of critical system components. The vulnerability specifically manifests when the system processes window size calculations and rendering operations, allowing an attacker to craft malicious window parameters that trigger buffer overflows or other memory corruption conditions. This type of flaw aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of improper input validation in kernel-level components.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a reliable method to gain administrative control over affected systems. Local users who can execute code on the target system can leverage this vulnerability to bypass standard security controls and elevate their privileges without requiring authentication or additional exploitation vectors. The attack scenario typically involves an attacker running a malicious application that creates specially crafted layered windows with invalid size parameters, which then triggers the privilege escalation mechanism. Once successful, the attacker gains complete administrative control over the system, enabling them to install malware, modify system files, access sensitive data, or establish persistence mechanisms. This vulnerability is particularly dangerous in enterprise environments where local access might be more readily available than remote attack vectors, and it represents a significant concern for organizations running outdated Windows versions.
Mitigation strategies for CVE-2006-5586 primarily focus on implementing Microsoft security updates and patches that address the underlying validation issues in the Graphics Device Interface component. Organizations should prioritize immediate deployment of the relevant security patches released by Microsoft to remediate this vulnerability. Additionally, system administrators should consider implementing application whitelisting policies that restrict the execution of unauthorized applications that might exploit this vulnerability. Network segmentation and least privilege access controls can help limit the potential impact if an attacker does manage to exploit this vulnerability. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the use of operating system vulnerabilities for elevated access. System monitoring should include detection of abnormal window sizing operations and layered window creation patterns that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should identify systems running unsupported Windows versions that remain susceptible to this and similar legacy vulnerabilities.