CVE-2019-1378 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows 10 Update Assistant in the way it handles permissions.A locally authenticated attacker could run arbitrary code with elevated system privileges, aka 'Windows 10 Update Assistant Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 09/26/2020
The vulnerability identified as CVE-2019-1378 represents a critical elevation of privilege flaw within the Windows 10 Update Assistant component that operates on Windows 10 systems. This vulnerability stems from improper handling of permissions during the update process, creating a pathway for malicious actors to escalate their privileges from standard user level to system level. The flaw exists in the Update Assistant's implementation of access control mechanisms, specifically in how it processes and validates user permissions when executing update operations. Attackers exploiting this vulnerability can leverage the compromised Update Assistant process to gain unauthorized administrative privileges, effectively bypassing the standard Windows security model that typically prevents non-privileged users from executing system-level operations.
The technical nature of this vulnerability aligns with CWE-276, which addresses improper privileges, and demonstrates how insufficient access control can lead to privilege escalation. The Update Assistant component typically runs with elevated privileges to perform system updates, but the flaw allows a local authenticated user to manipulate the update process to execute malicious code with system-level permissions. This occurs because the application fails to properly validate input parameters or enforce proper access controls during the update assistant execution flow. The vulnerability specifically affects Windows 10 systems where the Update Assistant is installed and actively used, creating a persistent threat vector that remains active as long as the vulnerable component exists on the system.
From an operational impact perspective, this vulnerability presents a significant risk to enterprise environments where multiple users may have local access to systems. The local authentication requirement means that attackers must first gain user-level access to the system, which is often achievable through various attack vectors such as phishing, credential theft, or physical access. Once authenticated, the attacker can exploit this vulnerability to execute arbitrary code with system privileges, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability's impact extends beyond individual system compromise as it can be used to establish a foothold for lateral movement within networks, particularly in environments where users may have legitimate access to multiple systems.
Security practitioners should implement immediate mitigations including applying the relevant Microsoft security updates that address this privilege escalation flaw. The vulnerability demonstrates characteristics consistent with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation', and organizations should monitor for suspicious process execution patterns that might indicate exploitation attempts. Additional defensive measures include implementing least privilege principles, restricting local user access where possible, and monitoring for unusual execution of update assistant processes. The vulnerability also highlights the importance of proper input validation and access control implementation in system components that handle elevated privileges, as outlined in security frameworks such as the CWE classification system. Organizations should also consider implementing application control policies to restrict execution of potentially vulnerable components and maintain regular vulnerability assessments to identify similar flaws in other system components.