CVE-2020-0871 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when Windows Network Connections Service fails to properly handle objects in memory, aka 'Windows Network Connections Service Information Disclosure Vulnerability'.
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Analysis
by VulDB Data Team • 04/11/2024
The vulnerability identified as CVE-2020-0871 represents a critical information disclosure flaw within the Windows Network Connections Service component. This issue manifests when the service fails to properly manage memory objects during network connection operations, creating potential avenues for unauthorized information exposure. The vulnerability resides in the core network management functionality of Windows operating systems, affecting multiple versions including Windows 10 and Windows Server 2019. The flaw stems from inadequate memory handling practices that allow malicious actors to potentially extract sensitive data through carefully crafted network connection requests.
From a technical perspective, this vulnerability operates at the memory management layer where the Network Connections Service processes network object references. The service maintains various network connection states and associated metadata in memory, but fails to properly validate or sanitize memory references during object lifecycle management. This improper handling creates memory corruption scenarios that can lead to information leakage through buffer overflows or memory pointer manipulation. The vulnerability specifically impacts how the service manages network connection objects during establishment, maintenance, and termination phases, where memory cleanup operations may not properly secure sensitive data. This aligns with CWE-125, which describes out-of-bounds read vulnerabilities, and CWE-248, which covers unspecified other issues in memory management.
The operational impact of CVE-2020-0871 extends beyond simple information disclosure, as it can enable attackers to gather sensitive network configuration data, connection state information, and potentially credentials or session tokens. Attackers could exploit this vulnerability through network-based attacks without requiring local system access, making it particularly dangerous in enterprise environments. The vulnerability's exploitation could lead to network reconnaissance activities where adversaries gather information about network topology, active connections, and system configurations. This information could then be leveraged for further attacks, including privilege escalation or lateral movement within the network infrastructure. The vulnerability's presence in Windows Network Connections Service means it affects systems across various network environments including corporate networks, cloud deployments, and hybrid infrastructures.
Security professionals should implement immediate mitigations including applying Microsoft security patches released in the May 2020 update cycle, which specifically address this memory handling flaw. Network segmentation and access controls should be strengthened to limit potential attack vectors, while monitoring systems should be configured to detect anomalous network connection patterns that might indicate exploitation attempts. The vulnerability's classification under the MITRE ATT&CK framework includes techniques related to credential access and reconnaissance, particularly T1083 for file and directory discovery and T1562 for impairing defenses. Organizations should conduct thorough vulnerability assessments to identify systems running affected Windows versions and ensure proper patch management protocols are in place. Additional mitigations include implementing network monitoring solutions that can detect unusual memory access patterns and configuring Windows Defender Application Control policies to restrict potentially malicious network service operations. The vulnerability demonstrates the critical importance of proper memory management in system services and the potential for seemingly minor implementation flaws to create significant security risks in network infrastructure components.