Exploiting Four-Byte Write and Timing Vulnerabilities to Bypass Windows SmartScreen Enclave

Researchers exploited a four-byte write and timing vulnerability to execute arbitrary code within a Windows VBS enclave, bypassing security measures designed to protect sensitive data. The attack targeted a protected memory area used for handling passwords in Windows' anti-phishing feature, demonstrating a critical flaw in isolated execution environments.

Security researchers ran their own code inside a protected part of Windows that is meant to stay sealed off even when the rest of the computer is taken over.

The protected area is a VBS enclave, an isolated slice of memory the operating system uses to guard secrets, and the one they broke into handles passwords for a Windows anti-phishing feature.

The work was done in a lab as a proof of

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