CVE-2020-0802 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Network Connections Service handles objects in memory, aka 'Windows Network Connections Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0778, CVE-2020-0803, CVE-2020-0804, CVE-2020-0845.
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Analysis
by VulDB Data Team • 04/10/2024
The vulnerability described in CVE-2020-0802 represents a critical elevation of privilege flaw within the Windows Network Connections Service component. This issue specifically manifests in how the service processes and manages objects stored in memory, creating an exploitable condition that allows malicious actors to escalate their privileges from standard user level to SYSTEM level access. The vulnerability affects multiple Windows operating systems including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly dangerous in enterprise environments where network connectivity is essential for operations. The flaw exists in the Windows Network Connections Service which is responsible for managing network connections and providing network configuration services to applications and users. This service runs with elevated privileges, making any memory handling vulnerabilities within it potentially catastrophic for system security. The vulnerability is categorized under CWE-121 which describes stack-based buffer overflow conditions, though the specific implementation involves memory management flaws in service objects that can be manipulated through improper input handling. The issue is distinct from related vulnerabilities CVE-2020-0778, CVE-2020-0803, CVE-2020-0804, and CVE-2020-0845, each representing different attack vectors within the Windows networking stack.
The technical exploitation of this vulnerability occurs when an attacker can manipulate objects in memory that are processed by the Windows Network Connections Service. The flaw allows for improper memory handling that can lead to memory corruption, potentially enabling arbitrary code execution with SYSTEM privileges. Attackers typically leverage this vulnerability by crafting specific inputs that cause the service to mishandle memory objects, leading to privilege escalation. The attack vector often involves local exploitation where an attacker already has a low-privilege user account on the target system. The vulnerability can be exploited through various means including crafted network packets, malformed configuration data, or by manipulating network connection state information. This memory handling issue represents a classic case of insufficient input validation combined with improper memory management, allowing attackers to overwrite critical memory structures. The exploitation process typically involves triggering the vulnerable service through network connection activities, causing the memory corruption that enables privilege escalation. From an attack perspective, this vulnerability aligns with ATT&CK technique T1068 which describes 'Exploitation for Privilege Escalation' and specifically addresses the use of service exploitation for gaining elevated privileges.
The operational impact of CVE-2020-0802 is severe and far-reaching across enterprise networks, as it provides attackers with a pathway to achieve SYSTEM-level access on affected systems. Once successfully exploited, the attacker can perform any action on the compromised system including installing malware, modifying system files, accessing sensitive data, and establishing persistence mechanisms. The vulnerability's impact extends beyond individual systems as compromised machines can serve as launching points for lateral movement within networks, potentially leading to complete network compromise. Organizations running affected Windows versions face significant risk of data breaches, system corruption, and unauthorized access to critical infrastructure. The vulnerability's presence in core networking services means that exploitation can occur during normal network operations, making detection difficult and increasing the likelihood of successful attacks. Security teams must consider the potential for this vulnerability to be used in advanced persistent threat campaigns where attackers seek long-term access to network resources. The impact is particularly concerning for systems that do not receive timely security updates, as the vulnerability remains exploitable until patched. Organizations with legacy systems or those using older Windows versions may face prolonged exposure to this threat. The vulnerability also affects virtualized environments and cloud deployments where Windows networking services are utilized, potentially compromising entire infrastructure stacks.
Mitigation strategies for CVE-2020-0802 should focus on both immediate remediation and long-term security enhancements. The primary and most effective mitigation is applying the official Microsoft security update released in April 2020 as part of the patch Tuesday cycle. Organizations should prioritize patch deployment across all affected Windows systems, particularly those with network connectivity and administrative access. Network segmentation and firewall rules can help limit the potential impact by restricting network access to systems running the vulnerable service. Implementing principle of least privilege configurations ensures that even if exploitation occurs, the attacker's access remains limited. Security monitoring should include detection of unusual network connection patterns and memory access anomalies that could indicate exploitation attempts. Endpoint detection and response solutions should be configured to monitor for suspicious activities related to the Windows Network Connections Service. Regular security assessments and vulnerability scanning should be conducted to identify systems that may have been missed during patch deployment. Organizations should also consider disabling unnecessary network services and implementing application whitelisting to prevent exploitation through unauthorized applications. From a compliance perspective, this vulnerability affects various security standards including those related to vulnerability management and access control. The mitigation approach should align with industry best practices for privilege escalation prevention and memory corruption defense mechanisms. Regular security awareness training for administrators can help prevent social engineering attacks that might be used in conjunction with this technical vulnerability.