CVE-2020-1209 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 • 10/23/2020
The Windows Network List Service elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows operating systems. This vulnerability specifically targets the network list service component that manages network connectivity information and maintains objects in memory. The flaw exists in how the service processes and handles memory objects, creating an opportunity for malicious actors to gain elevated system privileges. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise environments. The issue stems from improper handling of memory objects within the network list service, which can be manipulated by unauthorized users to execute arbitrary code with system-level privileges.
The technical implementation of this vulnerability involves memory corruption within the Windows Network List Service component. When the service processes certain network-related objects, it fails to properly validate or sanitize memory operations, leading to potential buffer overflows or memory manipulation opportunities. Attackers can exploit this by crafting malicious network objects or manipulating existing network configurations to trigger the vulnerable code path. The flaw operates at the kernel level where the network list service runs with elevated privileges, making successful exploitation particularly dangerous. According to CWE classification, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read conditions. The vulnerability's exploitation follows patterns consistent with privilege escalation techniques documented in the MITRE ATT&CK framework under T1068, which describes exploiting legitimate credentials and privileges to gain system access.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with persistent access to compromised systems. Once exploited, attackers can establish backdoors, install additional malware, or conduct further reconnaissance within the network. The vulnerability's stealth nature makes detection challenging since it operates within legitimate system services. Organizations may experience unauthorized access to sensitive network resources, data exfiltration, and potential lateral movement within their infrastructure. The attack vector typically involves local exploitation where an attacker already has user-level access to the system but seeks to elevate privileges. This makes the vulnerability particularly concerning for environments where user access is more prevalent, such as shared workstations or systems with multiple user accounts.
Mitigation strategies for this vulnerability should include immediate patch deployment through Microsoft's security updates, which address the memory handling flaws in the network list service. System administrators should implement the principle of least privilege, limiting user access to prevent unauthorized exploitation attempts. Network segmentation and monitoring solutions can help detect unusual network list service behavior that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems running affected versions of Windows. The Windows Defender Application Control feature can provide additional protection by restricting unauthorized code execution. Organizations should also implement proper logging and monitoring of network list service activities to detect anomalous behavior. According to Microsoft security guidance, systems should be updated promptly to prevent exploitation, as this vulnerability has been actively targeted in the wild. The mitigation approach aligns with defensive techniques outlined in the MITRE ATT&CK framework under defensive evasion and privilege escalation categories, emphasizing the importance of maintaining up-to-date system patches and implementing robust access controls.