CVE-2020-1241: 
vulnerability analysis and mitigation

A security feature bypass vulnerability (CVE-2020-1241) exists in the Windows Kernel when it fails to properly sanitize certain parameters. The vulnerability was disclosed on June 9, 2020, affecting multiple versions of Windows 10 and Windows Server systems. This vulnerability specifically involves the Windows kernel's handling of NULL page mitigation features (AttackerKB).

The vulnerability exists within the implementation of NtCreateEnclave, a function exposed through ntdll that was added in Windows 10 v1511. The issue specifically relates to bypassing the NULL page mitigation feature that prevents users from allocating memory at address 0. The vulnerability requires Intel's SGX functionality to be available on the host and typically needs to run on hardware rather than virtual machines. The CVSS v3 Base Score is 7.8 (High), with an Impact Score of 5.9 and Exploitability Score of 1.8 (AttackerKB).

While this vulnerability doesn't provide direct system access, it can be leveraged as an exploit primitive to bypass security features. It's particularly useful when combined with NULL Page Dereference or NULL Pointer Dereference vulnerabilities. The vulnerability affects confidentiality, integrity, and availability with high severity ratings (AttackerKB).

The vulnerability requires local access and user interaction to exploit. A locally-authenticated attacker would need to run a specially crafted application on the targeted system. The exploitation requires Intel SGX functionality and typically won't work in virtual machines, limiting its practical exploitation scenarios (AttackerKB).

Microsoft has released security updates to address this vulnerability by correcting how Windows Kernel handles parameter sanitization. The fix is available through the standard Windows Update mechanism (CVE).