CVE-2020-1137 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way the Windows Push Notification Service handles objects in memory, aka 'Windows Push Notification Service Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/17/2020
The Windows Push Notification Service elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows environments. This vulnerability specifically affects the handling of memory objects within the Windows Push Notification Service component, which is responsible for managing push notifications and background tasks across Windows operating systems. The issue stems from improper validation and handling of objects in memory, creating a pathway for malicious actors to execute code with elevated privileges. The vulnerability impacts multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly concerning for enterprise environments where these systems are prevalent. The flaw exists in the service's memory management routines, where insufficient input validation allows for memory corruption that can be exploited to gain SYSTEM-level privileges.
The technical exploitation of this vulnerability involves manipulating the memory objects handled by the Windows Push Notification Service to trigger a privilege escalation condition. Attackers can leverage this weakness by crafting specially designed push notification payloads or manipulating existing notification services to cause the service to improperly handle memory objects, leading to arbitrary code execution with elevated privileges. The vulnerability is categorized under CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow conditions, both of which are common attack vectors in privilege escalation scenarios. This flaw aligns with ATT&CK technique T1068, which describes 'Exploitation for Privilege Escalation' and specifically targets the Windows Push Notification Service as an attack surface. The memory handling error occurs during the processing of notification objects, where the service fails to properly validate the size and content of memory allocations, allowing attackers to overwrite critical memory locations.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to establish persistent access to compromised systems and potentially move laterally within networks. Once an attacker gains elevated privileges through this vulnerability, they can access sensitive system resources, modify critical files, install malicious software, and potentially compromise entire network infrastructures. The vulnerability's exploitation requires minimal user interaction, as it can be triggered through legitimate notification services, making it particularly dangerous in environments where push notifications are frequently used. Organizations with multiple Windows systems running the affected services face significant risk, as this vulnerability can be exploited across various deployment scenarios including corporate networks, cloud environments, and hybrid infrastructures. The vulnerability's presence in core Windows services means that exploitation can occur without requiring specialized attack tools or extensive system knowledge, making it accessible to a broad range of threat actors.
Mitigation strategies for this vulnerability should focus on immediate patch deployment and system hardening measures. Microsoft released security updates that address this vulnerability through patches that correct the memory handling procedures within the Windows Push Notification Service. Organizations should prioritize applying these patches as soon as possible, as the vulnerability remains exploitable in unpatched systems. Additional defensive measures include implementing strict network segmentation to limit access to notification services, monitoring for unusual notification service activity, and conducting regular security assessments of Windows environments. The vulnerability's classification as a critical risk by multiple security organizations underscores the importance of immediate remediation efforts. System administrators should also consider implementing application whitelisting policies to restrict execution of unauthorized code and deploy intrusion detection systems to monitor for exploitation attempts. Regular security training for personnel and maintaining up-to-date security configurations further reduce the risk of successful exploitation, as the vulnerability's impact is significantly mitigated through proper security posture maintenance and timely patch management procedures.