CVE-2018-8597 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." This affects Office 365 ProPlus, Microsoft Office, Microsoft Excel. This CVE ID is unique from CVE-2018-8636.
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Analysis
by VulDB Data Team • 06/18/2023
The vulnerability identified as CVE-2018-8597 represents a critical remote code execution flaw in Microsoft Excel software that stems from improper handling of objects in memory. This vulnerability specifically affects Microsoft Office 365 ProPlus, Microsoft Office, and Microsoft Excel installations, making it a widespread concern across enterprise and individual user environments. The flaw operates at the memory management level where Excel fails to properly validate or sanitize objects that are loaded into memory during document processing operations. This improper memory handling creates an exploitable condition that adversaries can leverage to execute arbitrary code on affected systems.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions that occur when software reads data beyond the boundaries of allocated memory regions. In the context of Excel, this manifests when the application processes specially crafted spreadsheet files that contain malformed objects or data structures. Attackers can construct malicious Excel files that trigger memory corruption when the application attempts to parse and render these objects, leading to potential code execution with the privileges of the logged-on user. The vulnerability is particularly dangerous because it can be exploited through social engineering attacks where users unknowingly open malicious Excel files, making it a prime target for phishing campaigns and targeted attacks.
From an operational impact perspective, this vulnerability enables adversaries to gain full control over affected systems without requiring authentication or specialized privileges. The remote code execution capability means that attackers can deploy malware, establish persistence mechanisms, or exfiltrate sensitive data directly from compromised endpoints. The vulnerability affects multiple versions of Microsoft Office and Excel, creating a broad attack surface that extends across different organizational environments and user configurations. Security teams must consider that this vulnerability can be exploited through various vectors including email attachments, malicious websites, or compromised documents shared through collaboration platforms, making comprehensive network monitoring and endpoint protection essential.
Mitigation strategies for CVE-2018-8597 should follow established security frameworks and include immediate deployment of Microsoft security patches and updates to address the memory handling flaws. Organizations should implement strict email filtering and sandboxing mechanisms to prevent users from opening potentially malicious Excel files. The principle of least privilege should be enforced by restricting user permissions and implementing application whitelisting policies that prevent execution of unauthorized code. Network segmentation and monitoring solutions should be configured to detect suspicious file transfers and execution patterns that may indicate exploitation attempts. Security controls should align with ATT&CK framework techniques such as T1059 for command and script interpreter usage and T1078 for valid accounts, as attackers may leverage compromised Excel installations to establish persistent access and execute further malicious activities. Additionally, regular security awareness training should be conducted to educate users about the risks of opening unexpected Excel files and the importance of verifying document sources before execution.