CVE-2018-0862 in Word
Summary
by MITRE
Equation Editor in Microsoft Office 2003, Microsoft Office 2007, Microsoft Office 2010, Microsoft Office 2013, and Microsoft Office 2016 allows a remote code execution vulnerability due to the way objects are handled in memory, aka "Microsoft Word Remote Code Execution Vulnerability". This CVE is unique from CVE-2018-0805, CVE-2018-0806, and CVE-2018-0807.
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Analysis
by VulDB Data Team • 08/18/2024
The vulnerability identified as CVE-2018-0862 represents a critical remote code execution flaw within Microsoft Office's Equation Editor component across multiple versions including Office 2003 through Office 2016. This vulnerability stems from improper handling of objects in memory during the processing of maliciously crafted documents, creating an exploitable condition that adversaries can leverage to execute arbitrary code on targeted systems. The Equation Editor functionality, designed to facilitate mathematical equation creation within Office documents, becomes a vector for sophisticated attacks due to insufficient input validation and memory management controls. Security researchers have classified this issue as particularly dangerous because it allows attackers to bypass traditional security measures and gain unauthorized access to vulnerable systems. The vulnerability operates at a fundamental level within Microsoft Office's document processing architecture, making it challenging to detect and prevent through conventional means.
The technical flaw manifests when the Equation Editor component processes malformed or specially crafted objects within Office documents, particularly those containing embedded equations or mathematical expressions. The vulnerability occurs due to a lack of proper bounds checking and memory management during object deserialization processes, allowing attackers to manipulate memory structures and potentially overwrite critical system components. This memory corruption vulnerability falls under the CWE-121 category of "Stack-based Buffer Overflow" and aligns with ATT&CK technique T1059.005 for Command and Scripting Interpreter. The flaw enables attackers to inject malicious code that executes with the privileges of the targeted user, potentially leading to complete system compromise. The vulnerability is particularly concerning because it can be triggered through simple document opening actions, making it an ideal candidate for phishing campaigns and social engineering attacks.
The operational impact of CVE-2018-0862 extends beyond simple code execution, potentially allowing attackers to establish persistent access, escalate privileges, and move laterally within compromised networks. Once successfully exploited, attackers can install backdoors, steal sensitive data, and maintain unauthorized access to systems for extended periods. The vulnerability affects organizations across various sectors including government agencies, financial institutions, and healthcare providers, making it a prime target for advanced persistent threat actors. The remote exploitation capability means that attackers can target users without requiring physical access to systems, significantly expanding the potential attack surface. Security professionals have noted that this vulnerability often remains undetected for extended periods due to its sophisticated nature and the difficulty in distinguishing legitimate Equation Editor usage from malicious activity.
Mitigation strategies for CVE-2018-0862 should encompass multiple layers of defense including immediate patch deployment, network segmentation, and enhanced monitoring capabilities. Microsoft released security updates addressing this vulnerability, and organizations must prioritize deployment of these patches across all affected Office versions. Network administrators should implement strict document filtering policies and disable Equation Editor functionality where possible, particularly in high-risk environments. The use of advanced threat detection systems and behavioral analysis tools becomes crucial for identifying potential exploitation attempts. Organizations should also consider implementing application whitelisting solutions and restricting user privileges to minimize potential impact if exploitation occurs. Regular security assessments and penetration testing help identify additional vulnerabilities that may exist within Office environments, while user education programs can reduce the likelihood of successful social engineering attacks targeting this vulnerability. The ATT&CK framework suggests implementing detection rules focused on suspicious Equation Editor processes and memory manipulation patterns to enhance defensive capabilities against this specific threat vector.