CVE-2019-1478 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when Windows improperly handles COM object creation, aka 'Windows COM Server Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 03/09/2024
The vulnerability identified as CVE-2019-1478 represents a critical elevation of privilege flaw within the Windows operating system that stems from improper handling of Component Object Model COM object creation processes. This vulnerability specifically affects how Windows manages the creation and execution of COM objects, which are fundamental components that enable software applications to communicate with each other through standardized interfaces. The flaw allows an attacker to potentially escalate their privileges from a standard user account to SYSTEM level access, thereby gaining complete control over the affected system.
The technical root cause of this vulnerability lies in the Windows COM server implementation where the system fails to properly validate or restrict the creation of certain COM objects that could be leveraged for malicious purposes. When a user interacts with specific applications or system components that trigger COM object instantiation, the vulnerable code path does not adequately enforce security boundaries or access controls. This improper handling creates a window of opportunity for attackers to manipulate the COM object creation process and subsequently execute arbitrary code with elevated privileges. The vulnerability is particularly concerning because COM objects are extensively used throughout Windows systems for various legitimate purposes, making the attack surface broad and difficult to fully mitigate through traditional perimeter defenses.
The operational impact of CVE-2019-1478 extends beyond simple privilege escalation, as it can enable attackers to establish persistent access, deploy additional malware, modify system configurations, or exfiltrate sensitive data. Once an attacker achieves SYSTEM-level privileges through this vulnerability, they can bypass most Windows security controls including User Account Control, file system permissions, and registry protections. This makes the vulnerability particularly attractive to threat actors who seek to maintain long-term access to compromised systems. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, with the potential for widespread exploitation across enterprise environments where these operating systems are prevalent. The attack vector typically involves tricking a user into executing malicious code through social engineering, phishing, or drive-by downloads that exploit the COM object creation flaw.
Security mitigations for CVE-2019-1478 primarily focus on applying Microsoft's official security patches and updates that address the underlying COM object handling mechanisms. Organizations should prioritize immediate deployment of the relevant Windows updates to remediate the vulnerability. Additionally, implementing application whitelisting policies can help prevent unauthorized COM object creation by restricting which applications can execute on the system. Network segmentation and monitoring solutions should be deployed to detect anomalous COM object activity that might indicate exploitation attempts. The vulnerability aligns with CWE-248, which describes the exposure of an unchecked exception, and can be mapped to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation'. Security teams should also consider implementing behavioral monitoring to detect suspicious COM object creation patterns and establish incident response procedures specifically tailored to address this type of elevation of privilege vulnerability. Regular security assessments and vulnerability scanning should include checks for this specific flaw to ensure comprehensive protection against potential exploitation attempts.