CVE-2018-8574 in Office
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka "Microsoft Excel Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Excel. This CVE ID is unique from CVE-2018-8577.
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Analysis
by VulDB Data Team • 06/06/2023
The vulnerability identified as CVE-2018-8574 represents a critical remote code execution flaw within Microsoft Excel software that stems from improper handling of objects in memory. This vulnerability specifically impacts Microsoft Office 365 ProPlus, Microsoft Office installations, and Microsoft Excel applications across multiple versions. The flaw manifests when Excel processes certain malformed or specially crafted objects within memory structures, creating opportunities for malicious actors to execute arbitrary code on affected systems. The vulnerability's classification as a remote code execution issue means that attackers can potentially compromise systems without requiring local access, making it particularly dangerous in enterprise environments where Excel is commonly used for document sharing and collaboration.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions where applications fail to properly validate memory access boundaries. In the context of Excel, this manifests when the application attempts to process objects that exceed expected memory boundaries or contain malformed data structures. The flaw occurs during the object handling phase of Excel's processing pipeline, where insufficient input validation allows attackers to craft malicious Excel files that trigger memory corruption when opened or processed by the vulnerable software. This memory corruption can then be leveraged to overwrite critical memory locations, potentially leading to arbitrary code execution with the privileges of the affected user.
The operational impact of CVE-2018-8574 extends beyond simple exploitation, as it can enable attackers to establish persistent access to compromised systems while maintaining stealth. According to ATT&CK framework techniques, this vulnerability can facilitate initial access through malicious file delivery methods such as spearphishing campaigns or compromised web downloads. Once executed, the remote code execution capability allows threat actors to perform lateral movement within networks, escalate privileges, and potentially establish command and control channels. The vulnerability affects a broad range of Microsoft Office products, making it particularly attractive to attackers who can target multiple endpoints simultaneously. Organizations with extensive Excel usage patterns, including those in financial services, government, and enterprise sectors, face heightened risk due to the prevalence of spreadsheet-based collaboration and document sharing.
Mitigation strategies for CVE-2018-8574 should encompass both immediate patch management and defensive operational measures. Microsoft released security updates that address the vulnerability through proper memory handling and input validation mechanisms, requiring administrators to deploy these patches promptly across all affected systems. Additionally, implementing strict file validation policies, such as disabling automatic execution of macros and restricting file type downloads from untrusted sources, provides additional layers of protection. Network segmentation and monitoring solutions should be deployed to detect anomalous behavior patterns associated with exploitation attempts, while user education programs can help reduce successful social engineering attacks that often precede exploitation of such vulnerabilities. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized Office applications and maintain regular backups to ensure rapid recovery from potential compromise scenarios.