KLA11172
Multiple vulnerabilities in Microsoft Development Tools

Multiple serious vulnerabilities have been found in Microsoft .NET Core, ASP.NET Core, Microsoft Excel and Microsoft Office Compatibility Pack. Malicious users can exploit these vulnerabilities to spoof user interface, obtain sensitive information, bypass security restrictions and gain privileges.

1. A remote code execution vulnerability can be exploited remotely via specially crafted file to execute arbitrary code;
2. An elevation of privilege vulnerability can be exploited remotely via specially crafted email with malicious link to gain privileges;
3. A Cross Site Request Forgery vulnerability can be exploited remotely via changing of recovery code for victim’s account to spoof user interface;
4. A security feature bypass vulnerability can be exploited remotely via using specially marked certificate to bypass security restrictions;

Technical details

Vulnerability (1) is related to Microsoft Excel and Microsoft Office Compatibility Pack. Vulnerabilities (2) and (3) are related to ASP.NET Core. Vulnerability (4) is related to .NET Core and Microsoft .NET Framework.

Microsoft .NET Framework 4.7.1

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)