CVE-2021-1723 : Security Advisory and Response
Microsoft's ASP.NET Core and Visual Studio 2019 versions 16.0 to 16.8 are affected by CVE-2021-1723, a Denial of Service vulnerability with a HIGH severity rating.
Microsoft released a security advisory regarding the ASP.NET Core and Visual Studio Denial of Service Vulnerability on January 12, 2021.
Understanding CVE-2021-1723
This CVE affects ASP.NET Core 3.1, ASP.NET Core 5.0, and multiple versions of Microsoft Visual Studio 2019, potentially leading to Denial of Service attacks.
What is CVE-2021-1723?
It is a Denial of Service vulnerability affecting ASP.NET Core and Microsoft Visual Studio, allowing attackers to disrupt the normal functioning of the software, impacting availability.
The Impact of CVE-2021-1723
The impact of this vulnerability is rated as HIGH, with a CVSS base severity score of 7.5.
Technical Details of CVE-2021-1723
This vulnerability allows remote attackers to cause a Denial of Service condition by sending specially crafted requests to the affected systems.
Vulnerability Description
The vulnerability exists due to insufficient validation of user-supplied inputs, leading to the software becoming unresponsive or crashing.
Affected Systems and Versions
- ASP.NET Core 3.1
- ASP.NET Core 5.0
- Microsoft Visual Studio 2019 versions 16.0 to 16.8
Exploitation Mechanism
Attackers can exploit this vulnerability by sending malicious requests to the affected applications, causing them to consume excessive resources and become unresponsive.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the risk posed by CVE-2021-1723 and implement long-term security practices.
Immediate Steps to Take
- Apply security patches provided by Microsoft promptly.
- Monitor network traffic for any suspicious activity.
- Restrict access to vulnerable systems.
Long-Term Security Practices
- Regularly update software and apply security patches.
- Conduct security audits and penetration testing.
- Educate users and developers about secure coding practices.
Patching and Updates
Microsoft has released patches to address this vulnerability. It is recommended to apply the latest security updates to protect systems from potential exploitation.