Horizon Alert
Summary of the vulnerability and why it matters
Microsoft Excel and related applications contain a flaw in how they process certain spreadsheet data. This weakness can allow an attacker to execute unauthorized code on a user's system. The primary impact of this vulnerability is the potential for attackers to compromise affected systems and gain control.
- Vulnerable spreadsheet processing
- Flaw in data record size
- Arbitrary code execution
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker to execute malicious code on an affected system by tricking a user into opening a specially crafted spreadsheet. Exploitation relies on the presence of a vulnerable version of Microsoft Excel or related viewer software, and the attacker's ability to deliver the malicious file to the target user. Successful exploitation could lead to unauthorized code execution, potentially allowing the attacker to compromise the affected system and gain control.
- Exposure condition: User opens malicious spreadsheet.
- Attacker starting point: No specific access required.
- Trigger and result: Invalid record triggers memory corruption, enabling code execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Microsoft Excel could allow attackers to execute arbitrary code. Attackers could leverage this by sending a specially crafted spreadsheet file. Organizations using affected versions of Microsoft Office or Excel Viewer should consider this a high-risk issue.
- Low attacker skill level
- Requires user to open malicious file
- Business risk is high
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Microsoft Office Excel may allow attackers to execute arbitrary code. The issue stems from a malformed spreadsheet that can corrupt memory. Organizations using affected versions of Excel should take immediate steps to identify and mitigate the risk to their systems and data.
- Find affected assets.
- Reduce exposure or isolate risk.
- Fix, verify, and monitor.
