Windows CLFS and five exploits used by ransomware operators (Exploit #4 – CVE-2023-23376)

This report analyzes CVE-2023-23376 in the Windows CLFS CONTROL record, describing the root cause, exploitation steps (malicious CLFS_CONTROL_RECORD, patched block headers, and index manipulation), and how the flaw enables arbitrary pointer usage, memory corruption and privilege escalation—techniques observed in ransomware attacks and related to earlier CLFS exploits.