CVE-2020-1371 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Event Logging Service improperly handles memory.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Windows Event Logging Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1365.
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Analysis
by VulDB Data Team • 10/30/2020
The vulnerability described in CVE-2020-1371 represents a critical elevation of privilege flaw within the Windows Event Logging Service component of Microsoft Windows operating systems. This vulnerability falls under the category of memory handling issues that can be exploited to escalate user privileges from standard user accounts to system-level access. The Windows Event Logging Service is responsible for collecting, storing, and managing event logs from various system components, making it a critical service that requires careful security consideration. The flaw specifically manifests when the service processes memory operations in an insecure manner, potentially allowing malicious code execution with elevated privileges.
This vulnerability operates through a memory corruption mechanism that occurs during the normal operation of the Windows Event Logging Service. When the service handles certain memory allocations or deallocations, it fails to properly validate input data or maintain proper memory boundaries, creating opportunities for attackers to manipulate memory structures. The technical implementation involves improper memory management practices that can lead to buffer overflows, use-after-free conditions, or other memory corruption scenarios. Attackers exploiting this vulnerability must first achieve initial execution on the target system, typically through social engineering, phishing, or other attack vectors, before leveraging the memory handling flaw to escalate privileges.
The operational impact of CVE-2020-1371 is significant as it provides attackers with a pathway to achieve system-level compromise from a standard user account. Once successfully exploited, the vulnerability allows unauthorized users to gain complete control over the affected Windows system, potentially enabling them to install malware, modify system files, access sensitive data, or establish persistent backdoors. The Windows Event Logging Service typically runs with elevated privileges, making it an attractive target for privilege escalation attacks. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, creating widespread exposure across enterprise environments where these systems are deployed.
Security professionals should implement several mitigation strategies to protect against exploitation of this vulnerability. Microsoft has released security patches through the monthly security updates that address the memory handling issues within the Windows Event Logging Service. Organizations should prioritize applying these patches as soon as possible, particularly in environments where the service is actively used. Network segmentation and privilege reduction measures can help limit the potential impact if exploitation occurs, while monitoring for unusual Event Logging Service activity may help detect exploitation attempts. The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and may also relate to CWE-125, representing out-of-bounds read conditions. From an ATT&CK framework perspective, this vulnerability maps to T1068, which covers 'Exploitation for Privilege Escalation', and T1059, covering 'Command and Scripting Interpreter', as attackers would need to execute commands after gaining elevated privileges. The attack surface is particularly concerning in enterprise environments where Windows Event Logging Service is configured to collect logs from multiple systems, as this increases the potential for successful exploitation and lateral movement within the network infrastructure.