CVE-2024-38172 in Excel
Summary
by MITRE • 08/13/2024
Microsoft Excel Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 06/22/2026
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 improper input validation and memory corruption issues within Excel's file parsing mechanisms. The most common exploitation vectors involve specially crafted spreadsheet files that trigger buffer overflows or use after free conditions when processing malformed data structures. Such vulnerabilities enable adversaries to gain unauthorized access to systems, execute malicious payloads, and potentially establish persistent backdoors. The impact extends beyond individual system compromise as attackers can leverage these flaws to conduct large-scale campaigns targeting multiple victims simultaneously. These vulnerabilities often fall under CWE-121 heap-based buffer overflow or CWE-476 null pointer dereference categories, which are fundamental memory safety issues that have been extensively documented in the cybersecurity community. The exploitation typically follows the attack pattern described in MITRE ATT&CK framework under technique T1203, where adversaries abuse legitimate system processes to execute malicious code. When an unsuspecting user opens a malicious Excel file, the vulnerability is triggered during file parsing operations, allowing attackers to inject and execute shellcode directly within the Excel process memory space.
The technical implementation of these vulnerabilities often involves crafting malicious Office documents that contain specially designed formulas, macros, or binary data structures that cause Excel to allocate insufficient memory or access invalid memory locations. Attackers frequently utilize techniques such as return-oriented programming or just-in-time compilation to bypass modern exploit mitigation mechanisms like address space layout randomization and data execution prevention. The exploitation process typically begins with initial access through phishing emails containing malicious attachments, followed by the execution of malicious macros or the triggering of unpatched vulnerabilities in the Excel application. These vulnerabilities are particularly dangerous because they can be exploited without requiring user interaction beyond opening the malicious file, making them ideal for mass deployment campaigns. The risk is amplified by the widespread use of Microsoft Excel across enterprise environments, where users frequently open spreadsheet files from untrusted sources. Security researchers have identified numerous variants of these vulnerabilities, including issues related to cell value processing, formula evaluation, and object linking and embedding operations within Excel files.
Organizations facing these vulnerabilities must implement comprehensive security measures to protect their systems from exploitation. Immediate remediation involves applying Microsoft security patches and updates as soon as they become available, which often address the underlying memory corruption issues. Network segmentation and email filtering solutions should be enhanced to detect and block malicious Office documents before they reach end users. Security awareness training programs must emphasize the importance of avoiding suspicious email attachments and verifying document sources before opening them. Additionally, administrators should configure Excel to disable macro execution by default and implement application control policies that restrict the execution of potentially malicious files. The implementation of endpoint detection and response solutions can help identify suspicious Excel process behavior and early indicators of compromise. Organizations should also maintain up-to-date vulnerability management processes that include regular scanning for unpatched systems and continuous monitoring for exploitation attempts. The security posture can be further strengthened by implementing principle of least privilege access controls and regular security assessments to identify potential attack vectors. These measures align with cybersecurity frameworks such as NIST SP 800-53 and ISO 27001 standards for information security management. Regular penetration testing and vulnerability assessments help organizations understand their exposure to these types of attacks and validate the effectiveness of their defensive measures.