CVE-2020-17123 : Security Advisory and Response
Learn about CVE-2020-17123, a Remote Code Execution vulnerability in Microsoft Excel. Discover affected systems, impact, and mitigation steps to secure your environment.
Microsoft Excel Remote Code Execution Vulnerability was published on December 8, 2020, with a CVSS base score of 7.8.
Understanding CVE-2020-17123
This CVE identifies a Remote Code Execution vulnerability in Microsoft Excel.
What is CVE-2020-17123?
The CVE-2020-17123 is a security vulnerability that allows remote attackers to execute arbitrary code on the target system by enticing a user to open a specially crafted file using the affected software.
The Impact of CVE-2020-17123
The impact of this vulnerability is rated as HIGH, with a CVSS base score of 7.8. Successful exploitation could lead to unauthorized access, data manipulation, and potential system compromise.
Technical Details of CVE-2020-17123
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability allows remote attackers to execute arbitrary code on the target system by exploiting a flaw in Microsoft Excel.
Affected Systems and Versions
The following systems and versions are affected:
- Office Online Server 2021
- Microsoft Office 2019
- Microsoft Office 2019 for Mac
- Microsoft 365 Apps for Enterprise
- Microsoft Excel 2016
- Microsoft Excel 2010 Service Pack 2
- Microsoft Excel 2013 Service Pack 1
- Microsoft Office Web Apps 2013 Service Pack 1
Exploitation Mechanism
Attackers can exploit this vulnerability by tricking a user into opening a malicious file, triggering the execution of arbitrary code on the system.
Mitigation and Prevention
To protect systems from CVE-2020-17123, follow these mitigation strategies:
Immediate Steps to Take
- Apply security patches provided by Microsoft.
- Educate users about the risks of opening files from unknown or untrusted sources.
- Implement email filtering to block suspicious attachments.
Long-Term Security Practices
- Regularly update software and security patches.
- Conduct security awareness training for employees to recognize phishing attempts.
Patching and Updates
Ensure that all affected systems are updated with the latest security patches from Microsoft to mitigate the risk of exploitation.