CVE-2018-8994 in Windows Master
Summary
by MITRE
In Windows Master (aka Windows Optimization Master) 7.99.13.604, the driver file (WoptiHWDetect.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0xf1002003.
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Analysis
by VulDB Data Team • 01/16/2020
The vulnerability identified as CVE-2018-8994 resides within Windows Master, specifically version 7.99.13.604, where the WoptiHWDetect.SYS driver component exhibits insufficient input validation behavior. This driver file operates at the kernel level and interfaces with user-mode applications through Windows I/O control codes, creating a potential attack surface where malicious input can be exploited to compromise system stability. The specific IOCTL code 0xf1002003 represents a critical interface point where the driver fails to properly validate incoming parameters, allowing for arbitrary data to be processed without adequate sanitization or bounds checking. This flaw manifests as a privilege escalation vulnerability that can be leveraged by local attackers to execute malicious code or cause system instability. The vulnerability directly corresponds to CWE-129, which describes improper validation of input boundaries, and aligns with ATT&CK technique T1068, which covers exploit for privilege escalation through local system vulnerabilities. The driver's failure to validate input values creates a path for attackers to manipulate system memory or trigger kernel-mode exceptions that ultimately result in system crashes or unexpected behavior.
The technical exploitation of this vulnerability occurs when a local user crafts malicious input parameters and sends them to the WoptiHWDetect.SYS driver through the specified IOCTL interface. Without proper input validation, the driver processes these malformed parameters and attempts to execute operations that may lead to memory corruption or invalid memory access patterns. The resulting system behavior can manifest as a blue screen of death (BSOD) when kernel-mode memory corruption occurs, or potentially allow for privilege escalation if the input manipulation can be directed toward critical system structures. This type of vulnerability represents a classic case of buffer over-read or improper parameter handling that allows attackers to manipulate the driver's execution flow. The lack of input sanitization creates a direct pathway for attackers to bypass normal system protections and potentially gain elevated privileges within the operating system context.
The operational impact of CVE-2018-8994 extends beyond simple denial of service scenarios, as it represents a potential gateway for more sophisticated attacks targeting system stability and user privileges. Local attackers who exploit this vulnerability can cause system-wide instability through BSOD conditions, which may result in data loss or service disruption in enterprise environments. The vulnerability's potential for unspecified other impacts suggests that attackers may be able to leverage the driver's improper input handling to achieve code execution or privilege escalation, making it particularly concerning for systems that run with elevated privileges. Organizations with multiple users or those that deploy Windows Master software may face increased risk of system compromise, especially when the software is installed with administrative privileges. The vulnerability's local nature means that exploitation does not require network access, making it particularly dangerous in environments where local access is difficult to monitor or control.
Mitigation strategies for CVE-2018-8994 should focus on both immediate remediation and long-term security hardening measures. The most effective immediate solution involves updating to a patched version of Windows Master that addresses the input validation issues within the WoptiHWDetect.SYS driver, which would align with the principle of least privilege by ensuring that only validated inputs are processed through kernel-mode interfaces. System administrators should implement strict access controls to prevent unauthorized local users from interacting with the vulnerable driver, including restricting user permissions and monitoring for unusual IOCTL activity. Additionally, implementing kernel-mode protection mechanisms such as driver signature enforcement and exploit protection features can help prevent exploitation of similar vulnerabilities. Organizations should also consider deploying endpoint detection and response solutions that can monitor for suspicious IOCTL activity patterns and alert security teams to potential exploitation attempts. The vulnerability's classification under CWE-129 and its potential mapping to ATT&CK technique T1068 emphasizes the need for comprehensive security controls that address both input validation weaknesses and privilege escalation attack vectors in kernel-mode drivers.