CVE-2019-0836 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when Windows improperly handles calls to the LUAFV driver (luafv.sys), aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0730, CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0841.
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Analysis
by VulDB Data Team • 06/28/2024
The vulnerability identified as CVE-2019-0836 represents a critical elevation of privilege flaw within the Windows operating system that specifically targets the LUAFV driver component. This vulnerability resides in the luafv.sys file which is responsible for handling file virtualization operations within the Windows kernel. The issue arises from improper handling of certain driver calls that allow malicious actors to escalate their privileges from standard user level to SYSTEM level access, effectively bypassing the operating system's security model. The vulnerability is particularly concerning because it operates at the kernel level where unauthorized access can result in complete system compromise.
The technical flaw manifests through improper input validation within the LUAFV driver's handling of specific IOCTL (Input/Output Control) requests. When Windows processes certain calls to the luafv.sys driver, it fails to properly validate the parameters passed to the driver, creating a potential attack vector for privilege escalation. This flaw allows an attacker to manipulate the driver's behavior through crafted inputs that can cause the kernel to execute arbitrary code with elevated privileges. The vulnerability is categorized under CWE-121 as a buffer overflow condition, though it more specifically represents a privilege escalation through improper access control mechanisms. The attack requires local user access to the system but can be exploited to gain SYSTEM-level privileges without requiring administrator credentials.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments where users may have local access to systems but should not possess administrative privileges. Attackers can leverage this flaw to establish persistent backdoors, escalate their access to sensitive system resources, and potentially move laterally within a network. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly dangerous in enterprise environments where these operating systems are commonly deployed. The exploitation of this vulnerability can result in complete system compromise, data exfiltration, and the establishment of persistent access points that are difficult to detect and remove.
Security professionals should implement immediate mitigations including applying the Microsoft security patches released for this vulnerability, which address the improper handling of driver calls within the LUAFV component. Organizations should also consider implementing additional security controls such as restricting local user access to systems where possible, monitoring for unusual driver activity, and ensuring that users cannot execute code with elevated privileges without proper authorization. The vulnerability aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and may also map to T1059 for command and scripting interpreter usage. Network segmentation and privilege monitoring should be enhanced to detect potential exploitation attempts, and regular security assessments should be performed to identify systems that may be vulnerable to similar privilege escalation flaws.