CVE-2018-8393 in Windows
Summary
by MITRE
A buffer overflow vulnerability exists in the Microsoft JET Database Engine that could allow remote code execution on an affected system, aka "Microsoft JET Database Engine Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8392.
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Analysis
by VulDB Data Team • 05/08/2023
The vulnerability identified as CVE-2018-8393 represents a critical buffer overflow flaw within Microsoft's JET Database Engine component, which serves as the foundation for various Microsoft Office applications and database management systems. This vulnerability resides in the way the JET engine processes certain database file structures, specifically when handling malformed or specially crafted database records that exceed allocated buffer boundaries. The flaw manifests when the engine attempts to parse database objects without proper bounds checking, creating an opportunity for malicious actors to exploit the memory corruption and execute arbitrary code on targeted systems.
The technical exploitation of this vulnerability leverages the inherent memory management weaknesses within the JET Database Engine's parsing mechanisms, where insufficient input validation allows attackers to overwrite adjacent memory locations through carefully constructed database files. This buffer overflow condition creates a potential code execution vector that can be triggered when vulnerable applications process malicious database content, including access to database files through Microsoft Office applications, Outlook, or other software components that rely on the JET engine for data storage and retrieval. The vulnerability's impact extends across multiple Windows operating systems including legacy versions such as Windows 7, Windows Server 2008, and newer releases like Windows 10, making it particularly dangerous due to its broad attack surface.
From an operational standpoint, this vulnerability poses significant risks to enterprise environments where Microsoft Office applications are widely deployed, as attackers can craft malicious database files that, when opened by unsuspecting users, trigger the buffer overflow condition. The remote code execution capability allows threat actors to gain full system control, potentially leading to data breaches, system compromise, and lateral movement within network infrastructures. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, while ATT&CK framework categorizes this as a code execution technique that could be leveraged for initial access or privilege escalation. The vulnerability's exploitation typically requires social engineering to deliver malicious database files through email attachments, web downloads, or removable media, making it particularly challenging to defend against without proper patch management protocols.
Organizations should prioritize immediate patch deployment through Microsoft's security updates to address this vulnerability, as the JET Database Engine remains integral to numerous Microsoft applications across the enterprise ecosystem. Additional mitigations include implementing strict file validation policies, disabling unnecessary database file processing capabilities, and employing application whitelisting solutions to prevent execution of untrusted database content. Network segmentation and monitoring solutions should be enhanced to detect suspicious database file access patterns, while security awareness training should emphasize the dangers of opening unknown database attachments. The vulnerability underscores the importance of maintaining comprehensive patch management programs and demonstrates how legacy database components can pose persistent security risks in modern enterprise environments where software dependencies remain complex and interconnected.