CVE-2024-0057: 
vulnerability analysis and mitigation

A security feature bypass vulnerability exists in Microsoft .NET Framework, .NET, and Visual Studio when applications use X.509 chain building APIs. The vulnerability affects multiple versions including .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1, .NET 6.0 (versions prior to 6.0.26), 7.0 (versions prior to 7.0.15), and 8.0.0. This vulnerability was disclosed on January 9, 2024 (NVD).

The vulnerability occurs when Microsoft .NET Framework-based applications use X.509 chain building APIs. Applications relying on inaccurate reason codes may misinterpret the failure as a successful chain build, allowing threat actors to bypass normal authentication logic by presenting invalid certificates (Arctic Wolf). The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (Critical) by NIST and 9.1 (Critical) by Microsoft (NVD).

Successful exploitation of this vulnerability could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS) (NetApp).

Microsoft has released security updates to address this vulnerability. It is strongly recommended to apply the available security updates to all impacted products to prevent potential exploitation (Arctic Wolf).