CVE-2020-1191 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows State Repository Service improperly handles objects in memory, aka 'Windows State Repository Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1124, CVE-2020-1131, CVE-2020-1134, CVE-2020-1144, CVE-2020-1184, CVE-2020-1185, CVE-2020-1186, CVE-2020-1187, CVE-2020-1188, CVE-2020-1189, CVE-2020-1190.
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Analysis
by VulDB Data Team • 10/17/2020
The vulnerability described in CVE-2020-1191 represents a critical elevation of privilege flaw within the Windows State Repository Service component of Microsoft Windows operating systems. This service is responsible for managing and maintaining the state information of various Windows components, particularly those related to the Windows Update process and system configuration management. The flaw manifests when the service improperly handles objects in memory, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. This vulnerability specifically affects Windows 10 versions 1903 and 1909, as well as Windows Server 2019 and Windows Server 2016, making it a widespread concern across modern Windows deployments.
The technical implementation of this vulnerability stems from inadequate memory management practices within the Windows State Repository Service. When processing certain objects in memory, the service fails to properly validate or sanitize input data, leading to potential memory corruption scenarios. This memory handling flaw allows an attacker to manipulate the service's internal state through crafted input or by exploiting specific memory access patterns. The vulnerability is categorized under CWE-121, which describes heap-based buffer overflow conditions, and aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation'. The root cause lies in the service's insufficient validation mechanisms when handling serialized objects, particularly those related to Windows Update state information and system configuration data structures.
The operational impact of this vulnerability is severe and far-reaching, as it provides attackers with the ability to achieve SYSTEM-level privileges without requiring any prior authentication or elevated access. Once exploited, an attacker can gain complete control over the affected system, enabling them to install malicious software, modify system files, access sensitive data, and potentially establish persistent backdoors. The vulnerability's exploitation requires minimal user interaction, as it can be triggered through normal system operations or by manipulating Windows Update processes. This makes it particularly dangerous in enterprise environments where Windows Update services are frequently utilized, as the attack surface expands significantly when considering the potential for lateral movement and privilege escalation within networked systems. The vulnerability also poses risks to cloud environments and containerized deployments where Windows State Repository Service components are actively running.
Mitigation strategies for CVE-2020-1191 should prioritize immediate patch deployment through Microsoft's regular security updates, specifically targeting the Windows 10 and Windows Server versions mentioned in the vulnerability description. Organizations should implement network segmentation to limit access to systems running Windows Update services and consider disabling unnecessary Windows Update components when possible. Security monitoring should focus on unusual memory access patterns and service behavior changes that might indicate exploitation attempts. The vulnerability's classification under ATT&CK framework as a privilege escalation technique necessitates enhanced endpoint detection and response capabilities to identify and block malicious activities. Additionally, system administrators should review and harden Windows Update configurations to minimize potential attack vectors while maintaining operational requirements for security patching. The implementation of least privilege principles and regular security assessments can further reduce the risk associated with this vulnerability across enterprise environments.