CVE-2020-0680 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-2020-0679, CVE-2020-0682.
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Analysis
by VulDB Data Team • 03/29/2024
The Windows Function Discovery Service Elevation of Privilege Vulnerability represents a critical security flaw within Microsoft's operating system infrastructure that allows attackers to escalate their privileges from standard user level to system level execution. This vulnerability specifically affects the Windows Function Discovery Service component which is responsible for discovering and managing network services and devices on Windows systems. The issue stems from improper handling of memory objects within this service, creating a pathway for malicious actors to execute arbitrary code with elevated privileges. The vulnerability is particularly concerning because it operates at the core of Windows networking functionality, making it accessible to attackers who can exploit it through various attack vectors.
The technical flaw manifests in the manner in which the Function Discovery Service processes memory objects during service operations. When the service handles certain input data or memory structures, it fails to properly validate or sanitize the incoming objects, leading to potential memory corruption or manipulation. This improper memory handling creates opportunities for attackers to craft malicious payloads that can be executed within the service context, ultimately allowing privilege escalation. The vulnerability is classified under CWE-121, which deals with stack-based buffer overflow conditions, and may also relate to CWE-125, heap-based buffer overflows, depending on the specific exploitation method. The service's memory management practices do not adequately protect against malicious input that could overwrite critical memory locations or manipulate execution flow.
The operational impact of this vulnerability extends across multiple Windows environments including Windows 10, Windows Server 2016, and Windows Server 2019 systems. Attackers can exploit this flaw to gain system-level privileges without requiring physical access or prior authentication, making it particularly dangerous in enterprise environments where network services are actively used. Once exploited, the vulnerability allows attackers to execute code with kernel-level privileges, potentially enabling complete system compromise, data exfiltration, or establishment of persistent backdoors. The attack surface is broad as the Function Discovery Service runs continuously on affected systems and handles various network discovery protocols. This vulnerability aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation', and may also involve T1059 for command execution once privileges are escalated.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches and updates, as well as network segmentation to limit access to affected services. Organizations should implement monitoring solutions to detect anomalous behavior in the Function Discovery Service and consider disabling unnecessary network discovery features when not required. System administrators should also review and harden service configurations to minimize attack surface, particularly focusing on the security settings of the Function Discovery Service. The vulnerability demonstrates the importance of proper memory management in system services and highlights the need for robust input validation across all Windows components. Security teams should also implement principle of least privilege configurations and regularly audit service permissions to prevent exploitation attempts. Additionally, endpoint detection and response solutions should be configured to monitor for suspicious memory access patterns or privilege escalation attempts that could indicate exploitation of this vulnerability.