CVE-2018-0884 in Windows
Summary
by MITRE
Windows Scripting Host (WSH) in Windows 10 Gold, 1511, 1607, 1703 and 1709, Windows Server 2016 and Windows Server, version 1709 allows a security feature bypass vulnerability due to how objects are handled in memory, aka "Windows Security Feature Bypass Vulnerability". This CVE is unique from CVE-2018-0902.
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Analysis
by VulDB Data Team • 02/04/2021
The vulnerability identified as CVE-2018-0884 affects Windows Scripting Host components across multiple Windows versions including Windows 10 Gold, 1511, 1607, 1703, and 1709, as well as Windows Server 2016 and Windows Server version 1709. This security flaw represents a critical bypass vulnerability that undermines Windows security mechanisms through improper object handling in memory. The vulnerability specifically targets the Windows Scripting Host subsystem which is responsible for executing script files and managing script objects within the Windows operating environment. The flaw allows attackers to circumvent security protections that should normally prevent unauthorized code execution or privilege escalation. This issue is classified under CWE-119 which deals with weaknesses in memory management, specifically related to improper handling of memory objects that can lead to security bypass scenarios.
The technical implementation of this vulnerability stems from how Windows Scripting Host processes and manages objects in memory during script execution. When scripts are interpreted and executed, WSH maintains various objects in memory space that are not properly validated or secured against malicious manipulation. This memory handling flaw creates opportunities for attackers to exploit the scripting environment and bypass security controls that are typically enforced by the operating system. The vulnerability operates at a fundamental level within the Windows security architecture, affecting how objects are allocated, accessed, and managed in memory. Attackers can leverage this weakness to execute arbitrary code or gain elevated privileges by manipulating script objects in ways that the normal security mechanisms fail to detect or prevent.
The operational impact of CVE-2018-0884 extends beyond simple script execution as it fundamentally undermines the security model of Windows Scripting Host. This vulnerability can be exploited by malicious actors to bypass security features such as application whitelisting, code integrity checks, and privilege separation mechanisms that are designed to protect the system from unauthorized access. The vulnerability affects both user-level and system-level operations since WSH is integral to many Windows functions including automated tasks, system administration scripts, and user interaction processes. The security bypass nature of this vulnerability means that successful exploitation could allow attackers to execute malicious code with elevated privileges, potentially leading to complete system compromise. This makes the vulnerability particularly dangerous in enterprise environments where script execution is common and security controls are expected to prevent such bypass scenarios.
Mitigation strategies for CVE-2018-0884 should focus on both immediate patching and operational security improvements. Microsoft released security updates that address the memory handling issues in WSH components, and organizations must apply these patches promptly to remediate the vulnerability. System administrators should also implement additional security controls such as restricting script execution privileges, implementing application control policies, and monitoring for suspicious script activity. The vulnerability aligns with ATT&CK technique T1059 which covers execution through scripting, and T1068 which addresses privilege escalation. Organizations should enhance their monitoring capabilities to detect anomalous script behavior and implement least privilege principles for script execution. Additionally, security teams should review and update their security policies to address the specific bypass capabilities this vulnerability presents, ensuring that traditional security controls remain effective against this type of memory-based attack vector.