CVE-2020-1336 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions. To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application. The security update addresses the vulnerability by ensuring the Windows Kernel properly handles objects in memory.
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Analysis
by VulDB Data Team • 02/23/2026
The vulnerability identified as CVE-2020-1336 represents a critical elevation of privilege flaw within the Windows Kernel component that fundamentally compromises system security boundaries. This weakness exists in the kernel's memory management handling mechanisms, specifically in how it processes and manages objects stored in memory. The vulnerability stems from insufficient validation and proper handling of memory objects during kernel operations, creating a potential pathway for malicious code execution with elevated privileges. The flaw affects Windows operating systems and demonstrates the inherent risks when kernel-level components fail to properly validate memory operations, potentially allowing unauthorized code execution with system-level privileges. The vulnerability's impact is particularly severe because it operates at the kernel level where all system processes and user applications interact with core operating system functions.
The technical exploitation of CVE-2020-1336 requires a locally authenticated attacker who can execute a specially crafted application on the target system. This attack vector operates under the premise that the attacker already possesses valid user credentials or has access to the system, which significantly reduces the complexity of the attack. The exploitation mechanism targets memory management functions within the Windows Kernel, specifically focusing on object handling routines that fail to properly validate memory references or object states. When an attacker crafts an application that triggers the vulnerable code path, the kernel's improper memory handling allows the malicious code to escalate privileges and gain system-level access. This process typically involves manipulating memory objects in ways that bypass normal privilege checks, ultimately enabling the attacker to execute arbitrary code with elevated permissions that would normally be restricted to system-level processes.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security model of Windows operating systems. Once successfully exploited, the vulnerability allows attackers to bypass standard security controls, potentially enabling full system compromise and persistent access. The implications are particularly concerning for enterprise environments where local authentication is common, as this vulnerability could be leveraged by insider threats or attackers who have obtained valid user credentials. The vulnerability's presence in the kernel means that successful exploitation could lead to complete system takeover, data exfiltration, and the ability to establish persistent backdoors. Organizations relying on Windows systems face significant risk if this vulnerability remains unpatched, as it provides a direct pathway to system-level control that could be used for advanced persistent threat operations.
Microsoft's security update for CVE-2020-1336 addresses the root cause by implementing proper memory object validation within the Windows Kernel. The fix ensures that kernel components properly handle memory objects and validate all memory operations before executing privileged code paths. This remediation aligns with security best practices outlined in the CWE catalog under CWE-119, which addresses memory safety issues and improper handling of memory objects. The patch specifically targets the kernel's object management routines and implements additional checks to prevent the exploitation scenario described in the vulnerability. Organizations should prioritize applying this update immediately, as the vulnerability's exploitability and potential for privilege escalation make it a critical security concern. The mitigation strategy emphasizes the importance of timely patch management and regular security updates to protect against kernel-level vulnerabilities that could compromise entire system infrastructures. This vulnerability also relates to ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," demonstrating how kernel-level flaws can be leveraged to bypass security controls and achieve elevated system access through well-crafted malicious code execution.