CVE-2018-8281 in Office
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory, aka "Microsoft Office Remote Code Execution Vulnerability." This affects Microsoft Excel Viewer, Microsoft PowerPoint Viewer, Microsoft Office, Microsoft Office Word Viewer.
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Analysis
by VulDB Data Team • 04/05/2023
The vulnerability identified as CVE-2018-8281 represents a critical remote code execution flaw within Microsoft Office software products, specifically affecting Excel Viewer, PowerPoint Viewer, Microsoft Office, and Word Viewer. This vulnerability stems from improper handling of objects in memory during the processing of specially crafted malicious files, creating a pathway for attackers to execute arbitrary code on affected systems. The flaw exists at the memory management level where Microsoft Office applications fail to properly validate and sanitize memory objects, leading to potential buffer overflows or memory corruption scenarios that adversaries can exploit.
From a technical perspective, this vulnerability operates through memory corruption mechanisms that align with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations. The vulnerability manifests when Microsoft Office applications process malformed or specially crafted Office documents that contain maliciously constructed objects in memory. These objects, when parsed by the vulnerable software, trigger memory corruption that allows attackers to overwrite critical memory locations and inject malicious code. The attack typically requires the victim to open a malicious file, making it a classic user-initiated attack vector that leverages social engineering tactics to deliver the exploit.
The operational impact of CVE-2018-8281 is severe and multifaceted, as it provides attackers with complete system compromise capabilities. Once executed, the remote code execution allows threat actors to install malware, steal sensitive data, establish persistence mechanisms, and potentially move laterally within network environments. The vulnerability affects multiple Microsoft Office products, increasing the attack surface and making it more difficult for organizations to maintain comprehensive protection. Organizations using these vulnerable applications face significant risks including data breaches, system infections, and potential full network compromise, particularly in environments where users frequently open Office documents from untrusted sources.
Mitigation strategies for CVE-2018-8281 should follow established cybersecurity frameworks and best practices. Microsoft has released security updates and patches to address this vulnerability, which organizations must deploy immediately across all affected systems. Network segmentation and email filtering solutions should be enhanced to prevent malicious Office documents from reaching end users. Implementing application whitelisting policies and disabling unnecessary Office features can reduce the attack surface. The vulnerability's characteristics align with tactics described in the MITRE ATT&CK framework under T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter), indicating that defensive measures should include monitoring for suspicious command execution patterns and anomalous network activity. Regular security awareness training for users to recognize phishing attempts and malicious document attachments remains crucial in preventing exploitation of this vulnerability.