CVE-2020-0725 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0691, CVE-2020-0719, CVE-2020-0720, CVE-2020-0721, CVE-2020-0722, CVE-2020-0723, CVE-2020-0724, CVE-2020-0726, CVE-2020-0731.
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Analysis
by VulDB Data Team • 03/30/2024
The vulnerability identified as CVE-2020-0725 represents a critical elevation of privilege flaw within the Windows operating system, specifically within the Win32k component that manages user-mode graphics rendering and windowing operations. This vulnerability stems from improper handling of objects in memory, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. The Win32k.sys driver serves as a crucial interface between user applications and the graphics subsystem, making it a prime target for attackers seeking to gain deeper system control. When the component fails to properly validate or manage memory objects during graphics operations, it creates exploitable conditions that can be leveraged by adversaries.
The technical flaw manifests when the Win32k component processes certain graphics-related API calls that involve memory management operations. Specifically, the vulnerability occurs during the handling of window objects and their associated memory structures, where insufficient validation allows for memory corruption that can be manipulated to execute arbitrary code with elevated privileges. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-125, which covers out-of-bounds read scenarios. The flaw enables attackers to bypass standard security mechanisms that normally prevent privilege escalation, effectively allowing malicious code to operate with the highest system privileges.
The operational impact of this vulnerability is severe as it provides attackers with a mechanism to gain SYSTEM-level access without requiring prior administrative credentials or complex exploitation techniques. Once exploited, the vulnerability allows for complete system compromise, enabling attackers to install malware, modify system files, access sensitive data, and potentially establish persistence mechanisms. The attack surface is particularly concerning because graphics operations are frequently performed by legitimate applications, making it difficult to distinguish between benign and malicious activity. This vulnerability can be exploited through various attack vectors including malicious documents, web-based attacks, or by leveraging other initial compromise techniques that lead to local execution.
Security professionals should implement immediate mitigations including applying the relevant Microsoft security updates that address the Win32k memory handling issues. Organizations should also consider implementing additional protective measures such as restricting user privileges, monitoring for unusual graphics-related API calls, and employing behavioral analysis tools to detect potential exploitation attempts. The vulnerability aligns with several ATT&CK techniques including privilege escalation through exploitation of software vulnerabilities and defense evasion through manipulation of system components. Network segmentation and application whitelisting can help reduce the risk of exploitation, while regular security assessments should focus on identifying and patching similar memory corruption vulnerabilities in other system components. The affected Windows versions include Windows 10, Windows Server 2016, and Windows Server 2019, making this a widespread concern across enterprise environments that require immediate attention and remediation.