New SignDrop Zero-Day Exploit Turns Windows CLFS Security Feature Into SYSTEM Access

A newly released exploit code, known as SignDrop, allegedly allows a local Windows user to elevate their privileges to SYSTEM level by targeting the Common Log File System driver. The exploit takes advantage of a log-authentication feature that was added to the driver last year. It works by abusing the way the clfs.sys driver creates companion files when a privileged process opens a prepared log, using path redirection to gain control. This exploit could potentially be used to gain elevated access to a Windows system. The SignDrop proof of concept targets the clfs.sys driver, which is a part of the Windows operating system. The exploit appears to rely on the specific behavior of the driver when handling log files and privileged processes.