CVE-2020-16919 in Windows
Summary
by MITRE • 10/17/2020
<p>An information disclosure vulnerability exists when the Windows Enterprise App Management Service improperly handles certain file operations. An attacker who successfully exploited this vulnerability could read arbitrary files.</p> <p>An attacker with unprivileged access to a vulnerable system could exploit this vulnerability.</p> <p>The security update addresses the vulnerability by ensuring the Windows Enterprise App Management Service properly handles file operations.</p>
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Analysis
by VulDB Data Team • 02/24/2026
This vulnerability represents a critical information disclosure flaw within the Windows Enterprise App Management Service that stems from improper handling of file operations. The vulnerability falls under the category of improper input validation and privilege escalation, where an unprivileged attacker can exploit the service to read arbitrary files from the system. The flaw manifests when the service processes file operations without adequate sanitization or access controls, allowing malicious actors to bypass normal file system restrictions and access sensitive data. This type of vulnerability is particularly dangerous in enterprise environments where the service may have elevated privileges or access to confidential system files. The issue aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-20, which covers improper input validation. The vulnerability exists in the Windows Enterprise App Management Service, a component that typically handles application deployment and management tasks within enterprise environments, making it a prime target for attackers seeking to extract sensitive information.
The operational impact of this vulnerability extends beyond simple data theft, as it enables attackers to potentially access system configuration files, user credentials, application data, and other sensitive information that could be leveraged for further compromise. Attackers can exploit this vulnerability by crafting specific file operation requests that trigger the flawed service behavior, allowing them to read files from locations that should normally be restricted. The attack vector is particularly concerning because it requires only unprivileged access to the target system, meaning that attackers who have already gained basic user-level access can escalate their privileges through information gathering. This aligns with ATT&CK technique T1005, which covers data from local system, and T1087, which involves account discovery. The vulnerability can be exploited through various means including local file inclusion attacks, path traversal techniques, or by directly interacting with the service's API endpoints that handle file operations.
The security update for CVE-2020-16919 addresses this vulnerability by implementing proper file operation handling within the Windows Enterprise App Management Service. Microsoft's fix ensures that the service properly validates file paths and implements adequate access controls to prevent unauthorized file access. The update likely includes enhanced input validation mechanisms that check file paths against a whitelist of allowed directories, proper permission checking before file operations, and sanitization of user-provided file paths. Organizations should prioritize applying this update as it directly addresses a critical information disclosure vulnerability that could lead to significant data breaches. The mitigation strategy should include monitoring for suspicious file access patterns and implementing network segmentation to limit the potential impact of successful exploitation. Additionally, system administrators should review and restrict access to the Enterprise App Management Service where possible, and ensure that the service runs with minimal required privileges to reduce the potential damage from successful exploitation. The vulnerability demonstrates the importance of proper privilege separation and input validation in enterprise service components, as highlighted by the NIST Cybersecurity Framework's focus on protecting system components and the MITRE ATT&CK framework's emphasis on information gathering techniques that exploit such flaws.