CVE-2007-3029 in Office
Summary
by MITRE
Unspecified vulnerability in Microsoft Excel 2002 SP3 and 2003 SP2 allows user-assisted remote attackers to execute arbitrary code via a malformed Excel file containing multiple active worksheets, which results in memory corruption.
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Analysis
by VulDB Data Team • 07/21/2019
Microsoft Excel 2002 Service Pack 3 and Excel 2003 Service Pack 2 contained a critical memory corruption vulnerability that enabled remote code execution through maliciously crafted spreadsheet files. This vulnerability specifically manifested when processing Excel files containing multiple active worksheets, creating a scenario where memory allocation and management became compromised during the rendering process. The flaw originated from insufficient input validation and memory handling within the worksheet processing engine, allowing attackers to construct specially formatted files that would trigger buffer overflows or heap corruption when opened by vulnerable versions of Excel.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read errors. Attackers could exploit this weakness by crafting Excel files with malformed worksheet structures that would cause the application to improperly handle memory allocation when processing multiple active sheets. The vulnerability required user interaction to execute successfully, as victims needed to open the malicious file, but once opened, the memory corruption would occur automatically during the rendering of the spreadsheet content. This user-assisted remote execution model reduced the attack surface compared to fully autonomous exploits but still represented a significant security risk given Excel's widespread use in corporate environments.
The operational impact of CVE-2007-3029 was substantial across enterprise networks, as Microsoft Excel remained one of the most commonly used applications in business settings. The vulnerability could be delivered through various attack vectors including email attachments, web downloads, or file sharing systems, making it particularly dangerous in environments where users regularly opened spreadsheet files from untrusted sources. Organizations using older versions of Excel without proper patch management protocols faced significant exposure, as the vulnerability could enable attackers to gain full system control through privilege escalation or direct code execution. The memory corruption aspect meant that successful exploitation could lead to system instability, data compromise, or complete system takeover depending on the execution context and privilege levels of the affected user.
Mitigation strategies for this vulnerability centered around immediate patch application as provided by Microsoft Security Bulletin MS07-037, which addressed the underlying memory handling issues in Excel's worksheet processing components. System administrators should have implemented comprehensive patch management procedures to ensure all vulnerable systems received updates promptly. Additional protective measures included restricting user permissions when opening spreadsheet files, implementing email filtering solutions to block suspicious Excel attachments, and deploying application whitelisting policies to prevent execution of untrusted Office documents. Network segmentation and security monitoring systems could help detect anomalous file access patterns or attempts to exploit the vulnerability through file transfer protocols. Organizations should have also considered disabling automatic execution of macros in Excel environments and implementing regular security awareness training to reduce the risk of social engineering attacks that might deliver malicious Excel files. The ATT&CK framework classification for this vulnerability would include techniques related to Office Application Usage and Execution through malicious file attachments, emphasizing the importance of endpoint protection and user behavior monitoring in defending against such threats.