CVE-2020-0679 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Function Discovery Service handles objects in memory, aka 'Windows Function Discovery Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0680, CVE-2020-0682.
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Analysis
by VulDB Data Team • 03/29/2024
The Windows Function Discovery Service represents a critical component within Microsoft Windows operating systems that facilitates the discovery and enumeration of network devices and services. This service operates with elevated privileges to access system resources and manage device connectivity across network environments. The vulnerability identified as CVE-2020-0679 specifically targets the memory handling mechanisms within this service, creating a path for unauthorized privilege escalation. The flaw manifests when the service processes certain objects in memory without proper validation or sanitization, allowing malicious actors to manipulate these objects and potentially execute code with system-level privileges.
This elevation of privilege vulnerability stems from improper input validation within the Windows Function Discovery Service implementation. The service receives and processes various object types from network communications and local system components, but fails to adequately verify the integrity and legitimacy of these objects before processing them in memory. The flaw falls under the CWE-121 category of Stack-based Buffer Overflow, though it manifests more specifically as a memory corruption vulnerability that enables privilege escalation through improper object handling. Attackers can exploit this weakness by crafting specially malformed objects that, when processed by the service, trigger memory corruption that can be leveraged to execute arbitrary code with elevated privileges.
The operational impact of CVE-2020-0679 extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within Windows environments. Once successfully exploited, the vulnerability allows adversaries to gain SYSTEM-level access, enabling them to manipulate system files, install malware, establish persistence mechanisms, and potentially move laterally within network environments. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly dangerous in enterprise environments where these systems are prevalent. From an ATT&CK framework perspective, this vulnerability maps to T1068 (Local Privilege Escalation) and T1059 (Command and Scripting Interpreter) techniques, as it enables attackers to execute commands with elevated privileges and establish persistent access.
Mitigation strategies for CVE-2020-0679 primarily focus on applying Microsoft security updates and patches released in the May 2020 security bulletin. Organizations should prioritize immediate deployment of the relevant Windows updates to address the memory handling flaw in the Function Discovery Service. Additionally, network segmentation and firewall rules can help limit exposure by restricting access to the Function Discovery Service ports and preventing unauthorized network communication that could trigger the vulnerability. System administrators should implement monitoring solutions to detect anomalous behavior in the Function Discovery Service, particularly around memory allocation patterns and object processing activities. The vulnerability also highlights the importance of maintaining up-to-date security practices and following Microsoft's recommended security configurations for Windows services to prevent similar memory corruption issues from being exploited in the future.