Rewterz Threat Advisory – Multiple MIcrosoft Excel Vulnerabilities

Severity

High

Analysis Summary

CVE-2023-24859 CVSS:7.5

Microsoft Excel is vulnerable to a denial of service, caused by a flaw in the Internet Key Exchange (IKE) Extension. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.

CVE-2023-23399 CVSS:7.8

Microsoft Excel could allow a remote attacker to execute arbitrary code on the system. By persuading a victim to open a specially-crafted file, an attacker could exploit this vulnerability to execute arbitrary code on the system.

CVE-2023-23398 CVSS:7.1

Microsoft Excel could allow a remote attacker to bypass security restrictions. An attacker could exploit this vulnerability to bypass security features to cause an impact on confidentiality, integrity and availability.

CVE-2023-23396 CVSS:5.5

Microsoft Excel is vulnerable to a denial of service. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to cause a denial of service condition.

Impact

• Code Execution
• Denial of Service
• Security Bypass

Indicators Of Compromise

CVE

• CVE-2023-24859
• CVE-2023-23399
• CVE-2023-23398
• CVE-2023-23396

Affected Vendors

Microsoft

Affected Products

• Microsoft Windows Server 2012
• Microsoft Windows Server 2016
• Microsoft Windows Server version 20H2
• Microsoft Windows 10 20H2 for 32-bit Systems
• Microsoft Windows 10 20H2 for ARM64-based Systems
• Microsoft Windows Server (Server Core installation) 2012 R2
• Microsoft Windows Server (Server Core installation) 2016
• Microsoft Windows Server for X64-based systems 2008 R2 SP1
• Microsoft Windows Server for X64-based systems (Server Core installation) 2008 SP2
• Microsoft Windows Server for 32-bit systems (Server Core installation) 2008 SP2
• Microsoft Windows Server for 32-bit systems 2008 SP2
• Microsoft Windows Server for X64-based systems (Server Core installation) 2008 R2 SP1
• Microsoft Windows 10 21H1 for 32-bit Systems
• Microsoft Windows 10 21H1 for ARM64-based Systems
• Microsoft Windows 10 21H1 for x64-based Systems
• Microsoft Windows Server for X64-based systems 2008 SP2
• Microsoft Windows 10 21H2 for 32-bit Systems
• Microsoft Windows 10 21H2 for ARM64-based Systems
• Microsoft Office Online Server
• Microsoft Office 2019 x32
• Microsoft Office 2019 x64
• Microsoft Office 2019 Mac
• Microsoft SharePoint Server 2019
• Microsoft 365 Apps for Enterprise x32
• Microsoft 365 Apps for Enterprise x64
• Microsoft Office LTSC 2021 x32
• Microsoft Office LTSC 2021 x64
• Microsoft Office LTSC for Mac 2021
• Microsoft Windows Server (Server Core installation) 20H2
• Microsoft Excel 2013 SP1 x32
• Microsoft Excel 2013 SP1 x64
• Microsoft Excel 2013 SP1 RT
• Microsoft Excel 2016 x32
• Microsoft Excel 2016 x64
• Microsoft Excel 2016 Click-to-Run x32
• Microsoft Excel 2016 Click-to-Run x64

Remediation

Use Microsoft Automatic Update to apply the appropriate patch for your system, or the Microsoft Security Update Guide to search for available patches.

CVE-2023-24859

CVE-2023-23399

CVE-2023-23398

CVE-2023-23396