CVE-2020-1276 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows kernel fails to properly handle objects in memory, aka 'Windows Kernel Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0986, CVE-2020-1237, CVE-2020-1246, CVE-2020-1262, CVE-2020-1264, CVE-2020-1266, CVE-2020-1269, CVE-2020-1273, CVE-2020-1274, CVE-2020-1275, CVE-2020-1307, CVE-2020-1316.
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Analysis
by VulDB Data Team • 10/23/2020
This vulnerability represents a critical elevation of privilege flaw within the Windows kernel that stems from improper handling of memory objects during kernel operations. The issue manifests when the kernel fails to correctly validate or manage objects allocated in memory space, creating opportunities for malicious actors to escalate their privileges from standard user level to system level access. Such vulnerabilities are particularly dangerous because they operate at the core of the operating system's security model where kernel-level privileges provide unrestricted access to all system resources and data. The vulnerability falls under the category of kernel-mode exploitation, which typically requires sophisticated attack techniques to achieve successful privilege escalation.
The technical mechanism behind this vulnerability involves memory management flaws that allow attackers to manipulate kernel objects in ways that bypass normal security checks. When the Windows kernel processes certain memory operations, it fails to properly validate the integrity of objects being manipulated, potentially allowing crafted inputs or memory corruption to alter kernel behavior. This type of flaw commonly relates to improper memory validation, object management, or access control mechanisms within kernel components. The vulnerability's classification aligns with CWE-122, which addresses improper restriction of operations within a memory buffer, and may also connect to CWE-248, which covers exposure of an exception to external actors. The attack vector typically involves exploiting specific kernel APIs or system calls that handle memory objects, where the kernel's validation logic contains gaps that can be leveraged.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete system compromise capabilities. Once successfully exploited, an attacker can gain unrestricted access to all system files, user data, network resources, and can potentially establish persistence mechanisms within the compromised system. This vulnerability particularly affects enterprise environments where multiple users interact with systems, as it allows attackers to elevate their privileges from standard user accounts to administrative or SYSTEM level access. The vulnerability's impact is amplified by the fact that kernel-level exploits are often undetectable by traditional endpoint protection solutions, as they operate below the level of user-mode security controls. This characteristic aligns with ATT&CK technique T1068, which covers local privilege escalation through kernel exploits, and T1547, which addresses boot or logon initialization scripts that can be leveraged for privilege escalation.
Mitigation strategies for this vulnerability should include immediate patch deployment from Microsoft as the primary defense mechanism, as the vendor has released specific security updates addressing the memory handling flaws in the kernel. Organizations should implement comprehensive monitoring for suspicious kernel-level activities and ensure that automatic update mechanisms are enabled to maintain current security patches. System administrators should also consider implementing additional security controls such as kernel-mode driver signing requirements, exploit protection features, and runtime application control policies that can detect and prevent exploitation attempts. The vulnerability's nature suggests that layered defense approaches are essential, combining timely patch management with behavioral monitoring and access control restrictions to minimize the attack surface available to potential exploiters. Additionally, organizations should review their privileged account management practices and implement just-in-time administrative access controls to limit the potential damage from successful exploitation attempts.