Is This Sid Taken? Varonis Hazard Labs Finds Synthetic Sid Shot Assault Online

The vulnerability relies on the way Windows handles SID resolution. Because the system allows adding SIDs that aren't yet mapped to a user, the ACL essentially waits for its "missing half".

For more detailed technical analysis, you can view the original research on the Varonis Blog . The vulnerability relies on the way Windows handles

A low-level account created later can suddenly "wake up" with Administrative or Domain Admin rights if those rights were pre-injected into the synthetic SID. The vulnerability relies on the way Windows handles