CVE-2019-1297 in Excel
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'.
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Analysis
by VulDB Data Team • 02/07/2025
The vulnerability identified as CVE-2019-1297 represents a critical remote code execution flaw within Microsoft Excel software that stems from improper handling of objects in memory. This vulnerability specifically affects Microsoft Excel versions prior to the security updates released in July 2019, creating a significant attack surface for malicious actors who can exploit the flaw remotely. The issue manifests when Excel processes certain file formats or objects that trigger memory corruption conditions, allowing attackers to execute arbitrary code on affected systems. The vulnerability has been classified under CWE-125 as an "Out-of-bounds Read" condition, which occurs when the software attempts to access memory locations beyond the intended boundaries. This particular weakness enables attackers to manipulate memory structures in ways that bypass standard security controls and execute malicious payloads without user interaction in many scenarios.
The technical exploitation of CVE-2019-1297 typically involves crafting specially malformed Excel files that contain malicious objects or data structures designed to trigger the memory handling flaw during normal file processing operations. When an unsuspecting user opens such a malicious file, the Excel application attempts to parse the corrupted data structures, leading to memory corruption that can be leveraged to execute arbitrary code with the privileges of the targeted user. The vulnerability operates through the Office Rendering Engine, which is responsible for processing various file formats including xls, xlsx, and other spreadsheet formats. Attackers can leverage this flaw in phishing campaigns where they send malicious Excel files via email, or through drive-by download scenarios where compromised websites automatically deliver the malicious payload. This vulnerability is particularly dangerous because it can be exploited remotely without requiring any user interaction beyond opening the malicious file, making it a prime target for automated exploitation frameworks.
The operational impact of CVE-2019-1297 extends beyond simple code execution, as successful exploitation can lead to full system compromise and persistent access within corporate networks. Once an attacker gains remote code execution capabilities, they can establish backdoors, escalate privileges, and move laterally through network infrastructure to access sensitive data and systems. The vulnerability's classification under the ATT&CK framework places it within the 'Execution' and 'Persistence' domains, where attackers can use it to establish initial access and maintain long-term presence on compromised systems. Organizations running affected Excel versions face significant risk of data breaches, intellectual property theft, and operational disruption, particularly in environments where Excel files are frequently shared and opened by multiple users. The vulnerability affects not only individual users but also enterprise environments where Excel is used extensively for business operations, making it a high-priority target for nation-state actors and organized cybercriminal groups.
Mitigation strategies for CVE-2019-1297 primarily focus on immediate patching and implementation of security controls to reduce attack surface. Microsoft released security updates in July 2019 that address this vulnerability, and organizations should prioritize applying these patches across all affected systems. Additional protective measures include implementing strict file validation policies, disabling automatic opening of files from untrusted sources, and deploying application whitelisting solutions to prevent execution of unauthorized code. Network-based protections such as email filtering systems can help identify and block malicious Excel files before they reach end users, while endpoint detection and response solutions can monitor for suspicious execution patterns. Organizations should also consider implementing sandboxing techniques for processing untrusted Excel files and establishing robust incident response procedures to quickly identify and contain exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against sophisticated remote code execution attacks that can bypass traditional security controls.