CVE-2024-38170 in Excel
Summary
by MITRE • 08/13/2024
Microsoft Excel Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 05/29/2026
Microsoft Excel remote code execution vulnerabilities represent critical security flaws that allow attackers to execute arbitrary code on targeted systems through malicious Excel files. These vulnerabilities typically arise from insufficient input validation and improper memory handling within Excel's file parsing mechanisms. The most common exploitation vectors involve specially crafted spreadsheet files that contain malicious formulas, embedded objects, or malformed data structures designed to trigger buffer overflows or other memory corruption conditions. When a user opens such a malicious file, the vulnerability is triggered during the parsing process, enabling attackers to gain unauthorized code execution privileges on the victim's system. The severity of these vulnerabilities is particularly high because Excel is widely used across enterprise environments, making successful exploitation potentially devastating for organizational security posture.
The technical implementation of these vulnerabilities often involves exploitation of memory corruption issues such as buffer overflows, use-after-free conditions, or integer overflows within Excel's parsing libraries. Attackers typically craft malicious files that leverage specific formula functions or data types that cause Excel to allocate insufficient memory buffers or improperly handle data structures. These flaws may be classified under CWE-119 for memory safety issues or CWE-121 for stack-based buffer overflow conditions. The exploitation process frequently requires precise control over memory layout and execution flow, often utilizing techniques such as return-oriented programming or just-in-time compilation to achieve reliable code execution. The vulnerability can be triggered through various attack vectors including email attachments, web downloads, or file sharing platforms where users unknowingly open malicious Excel documents.
The operational impact of Excel remote code execution vulnerabilities extends far beyond individual system compromise, as these flaws can enable widespread lateral movement within enterprise networks. Once an attacker successfully exploits such a vulnerability, they can establish persistent access, escalate privileges, and potentially gain control over critical business systems. The attack surface is particularly broad since Excel is commonly used across all departments and user roles, making it an attractive target for threat actors seeking to establish footholds within organizations. These vulnerabilities often map to ATT&CK techniques such as T1059 for command and scripting interpreter usage and T1068 for local privilege escalation. The potential for data exfiltration, system disruption, and further attack progression makes these vulnerabilities particularly dangerous in enterprise environments where sensitive financial and operational data resides within Excel workbooks.
Mitigation strategies for Excel remote code execution vulnerabilities require a multi-layered approach combining technical controls, user education, and administrative policies. Organizations should implement strict file execution policies that restrict the opening of executable content from untrusted sources, deploy application whitelisting solutions to control which Excel versions and add-ins can run, and ensure regular patch management to address known vulnerabilities. Network-based protections such as email filtering, web proxies, and content inspection systems can help prevent malicious Excel files from reaching end users. Security awareness training should emphasize the dangers of opening unexpected Excel attachments and encourage users to verify file sources before opening documents. Additionally, implementing sandboxing technologies and running Excel in restricted environments can limit the potential damage from successful exploitation attempts. Regular security assessments and vulnerability scanning should specifically target Excel-related components to identify and remediate potential weaknesses in the office suite's security posture.