CVE-2020-1406 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Network List Service handles objects in memory, aka 'Windows Network List Service Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/29/2020
The Windows Network List Service Elevation of Privilege Vulnerability represents a critical security flaw that resides within the Windows operating system's network management infrastructure. This vulnerability specifically targets the Network List Service component which is responsible for managing network connectivity information and maintaining the state of network connections within the Windows environment. The issue manifests when the service improperly handles certain objects in memory, creating an opportunity for malicious actors to escalate their privileges from standard user level to system level access. The vulnerability stems from insufficient input validation and memory management practices within the service's code execution pathways, allowing crafted inputs to manipulate the service's behavior in ways that were not anticipated by the original design.
The technical exploitation of this vulnerability occurs through a memory corruption issue that arises when the Network List Service processes specific network-related data structures. Attackers can leverage this flaw by crafting malicious network events or manipulating network connection states that cause the service to improperly handle memory objects. This improper handling creates a condition where arbitrary code execution becomes possible within the context of the Network List Service, which typically runs with high privileges. The vulnerability's classification as an elevation of privilege issue means that successful exploitation allows an attacker to gain system-level access without requiring administrator credentials initially. This represents a significant threat to Windows environments since the Network List Service operates with sufficient privileges to access sensitive system resources and manipulate network configurations.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to establish persistent access to compromised systems while potentially bypassing traditional security controls. Once escalated to system level, attackers can manipulate network configurations, access encrypted communications, and potentially pivot to other systems within the network. The vulnerability affects 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. Network administrators face the challenge of identifying compromised systems without direct evidence of exploitation, as the vulnerability can be leveraged silently in the background. The flaw's memory-based nature makes detection particularly difficult since it doesn't necessarily generate obvious network traffic patterns or system logs that would immediately indicate compromise.
Security mitigations for this vulnerability primarily focus on applying Microsoft's official patches and updates as released through Windows Update channels. Organizations should prioritize immediate deployment of the security patches provided by Microsoft, as these address the underlying memory handling issues within the Network List Service. System administrators should also implement additional monitoring around network service behavior and memory allocation patterns to detect potential exploitation attempts. Network segmentation and principle of least privilege configurations can help limit the potential damage if exploitation does occur, though the vulnerability's nature makes complete prevention difficult without patching. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and reflects patterns commonly associated with the ATT&CK technique T1068, which covers exploit for privilege escalation. Organizations should also consider implementing application whitelisting policies to restrict unauthorized code execution, and maintain regular vulnerability scanning to identify systems that may have been compromised before patching was applied.