CVE-2020-1346 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Modules Installer improperly handles file operations, aka 'Windows Modules Installer Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/30/2020
The Windows Modules Installer elevation of privilege vulnerability represents a critical security flaw in Microsoft's operating system infrastructure that allows attackers to escalate their privileges from standard user level to system level access. This vulnerability specifically targets the Windows Modules Installer service which is responsible for managing the installation and removal of device drivers and system components. The flaw stems from improper handling of file operations within the installer service, creating a path for malicious actors to manipulate system files and gain unauthorized administrative privileges. The vulnerability affects multiple versions of Windows including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments. According to the Common Weakness Enumeration database, this vulnerability maps to CWE-264, which describes permissions, privileges, and access control issues that allow attackers to escalate their privileges within a system. The vulnerability's classification aligns with the ATT&CK framework's privilege escalation techniques, specifically targeting the 'Modify Registry' and 'Process Injection' methods that attackers commonly employ to gain elevated system access.
The technical exploitation of this vulnerability occurs when the Windows Modules Installer service processes certain file operations without proper validation of file paths or access permissions. Attackers can craft malicious installation packages or manipulate existing system files to trick the installer into executing code with elevated privileges. The flaw typically manifests when the installer service performs operations on files that are not properly sandboxed or validated, allowing attackers to inject malicious code into legitimate system processes. The vulnerability can be triggered through various attack vectors including malicious software installation, compromised update packages, or by exploiting other initial access points to gain a foothold before escalating privileges. The installer service operates with high privileges to ensure proper system component management, but this elevated access creates a security boundary that can be exploited when file operations are not properly validated.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system control and access to sensitive data. Once an attacker successfully exploits this vulnerability, they can modify system files, install backdoors, access encrypted data, and potentially establish persistence within the compromised system. The vulnerability's impact is particularly severe in enterprise environments where multiple users share systems and where administrative privileges are frequently required for legitimate business operations. Organizations may experience data breaches, system compromise, and potential lateral movement within their network infrastructure as attackers leverage the elevated privileges to explore and expand their access. The vulnerability's exploitation can lead to complete system compromise, making it a high-priority target for threat actors and a critical concern for security teams managing Windows-based environments.
Mitigation strategies for this vulnerability require immediate patch deployment from Microsoft as part of the regular security update cycle, with particular attention to the Windows Modules Installer service. Organizations should implement the principle of least privilege by limiting user accounts to standard permissions and avoiding unnecessary administrative access. Network segmentation and monitoring solutions should be deployed to detect suspicious file operations and installation activities that might indicate exploitation attempts. Security teams should monitor Windows event logs for unusual installer service activities, particularly around file creation and modification operations. The vulnerability's exploitation can be detected through behavioral analysis and anomaly detection systems that monitor for unauthorized privilege escalation attempts. Additionally, organizations should conduct regular security assessments and penetration testing to identify potential exploitation vectors and ensure that all systems remain protected against this and similar vulnerabilities. Microsoft recommends applying the security update as soon as possible and implementing additional security controls such as application whitelisting and enhanced monitoring of system installation activities to prevent exploitation of this critical vulnerability.