CVE-2024-49030 in Office
Summary
by MITRE • 11/12/2024
Microsoft Excel Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 02/27/2025
Microsoft Excel remote code execution vulnerabilities represent critical security flaws that allow attackers to execute arbitrary code on affected systems through maliciously crafted Excel files. These vulnerabilities typically arise from insufficient input validation and memory corruption issues within Excel's parsing mechanisms for various file formats including xls, xlsx, and xlsm. The technical exploitation occurs when Excel processes malformed or specially crafted spreadsheet elements that trigger buffer overflows, use-after-free conditions, or other memory corruption vulnerabilities in the application's underlying codebase.
The operational impact of these vulnerabilities extends far beyond simple data manipulation, as successful exploitation can result in complete system compromise and persistent access for threat actors. Attackers often leverage these flaws through phishing campaigns distributing malicious Excel files that appear legitimate to unsuspecting users. When victims open these compromised documents, the malicious code executes within the context of the user's privileges, potentially escalating to SYSTEM level access depending on the target environment. The vulnerability's remote nature means attackers can exploit systems without requiring physical access or prior authentication, making it particularly dangerous in enterprise environments where users frequently open spreadsheet files from external sources.
These vulnerabilities are commonly classified under CWE-119 Improper Restriction of Operations within a Memory Buffer and CWE-476 NULL Pointer Dereference, with exploitation patterns aligning with ATT&CK techniques such as T1059 Command and Scripting Interpreter and T1203 Exploitation for Client Execution. The attack surface includes various Excel file formats and parsing functions that handle external data sources, formulas, macros, and embedded objects. Microsoft typically addresses these issues through cumulative security updates that patch the underlying memory corruption flaws, though zero-day exploits may persist in environments where updates have not been deployed. Organizations should implement layered defense strategies including email filtering, macro security controls, regular patch management, and user education to mitigate the risk of exploitation.
The remediation approach requires immediate deployment of Microsoft security patches alongside administrative controls such as disabling macro execution by default, implementing application whitelisting policies, and monitoring for suspicious file access patterns. Network segmentation and endpoint detection and response solutions can provide additional protection layers against exploitation attempts. Regular vulnerability assessments should target Excel-related attack vectors including macro-enabled files, external data connections, and document automation features that may introduce additional attack surfaces beyond the core parsing vulnerabilities.