CVE-2023-20578

Summary

CVE-2023-20578 is a Time-Of-Check-Time-Of-Use (TOCTOU) vulnerability affecting the System Management Mode (SMM). An attacker with ring0 privileges and access to the BIOS menu or UEFI shell can exploit this flaw to modify the communications buffer in SMM. The consequence of this manipulation could be arbitrary code execution, posing a significant security risk. This issue emphasizes the importance of securing low-level system components and updating firmware regularly to mitigate such vulnerabilities.

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