CVE-2020-0728 in Windows
Summary
by MITRE
An information vulnerability exists when Windows Modules Installer Service improperly discloses file information, aka 'Windows Modules Installer Service Information Disclosure Vulnerability'.
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Analysis
by VulDB Data Team • 03/30/2024
The Windows Modules Installer Service Information Disclosure Vulnerability represents a significant security flaw within Microsoft's operating system infrastructure that allows unauthorized information disclosure through improper file handling mechanisms. This vulnerability specifically affects the Windows Modules Installer Service which is responsible for managing the installation and removal of Windows components and modules. The issue manifests when the service fails to properly sanitize file information during processing operations, potentially exposing sensitive metadata or file paths to unauthorized users or processes running on the same system.
This information disclosure vulnerability operates at the kernel level within the Windows operating system, leveraging the service's interaction with file system resources during module installation processes. The flaw stems from inadequate validation of file access requests and improper handling of file metadata within the service's internal processing pipeline. When legitimate installation or update operations occur, the service inadvertently exposes file system information through error messages, log entries, or direct file access mechanisms that should remain restricted to authorized system components. The vulnerability is particularly concerning because it operates within a privileged service context that has extensive file system access rights, making the potential information exposure more severe than typical user-level file access issues.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential attack vectors for more sophisticated exploitation techniques. An attacker who successfully leverages this vulnerability could gain insights into the target system's file structure, installed components, and potentially identify other system weaknesses or misconfigurations. This information could be used to plan more targeted attacks or to identify specific system vulnerabilities that might be exploited through additional attack vectors. The vulnerability affects systems running vulnerable versions of Windows 10 and Windows Server 2019, where the service operates with elevated privileges and has broad access to system resources. The information exposure occurs during normal system operations rather than requiring specific malicious actions, making it particularly dangerous as it can be exploited without significant user interaction or system compromise.
Security professionals should note that this vulnerability aligns with CWE-200, which describes improper handling of information exposure, and represents a classic case of insufficient access control within system services. The ATT&CK framework categorizes this under T1087, which covers account discovery, as the vulnerability could potentially reveal information about system accounts and file access patterns. Microsoft addressed this vulnerability through security updates that improved file access validation and strengthened the service's handling of file system metadata. Organizations should ensure that all systems are updated with the appropriate patches, as the vulnerability could be exploited by attackers to gather intelligence for more complex attacks. The fix implemented by Microsoft involves enhanced input validation within the Windows Modules Installer Service to prevent unauthorized disclosure of file information during normal system operations. Regular security assessments should include verification that the service is operating with proper access controls and that no unauthorized information disclosure occurs during routine module installation processes.