Microsoft Windows Accessibility Infrastructure (ATBroker.exe) Elevation of Privilege Vulnerability Exploit

ATBroker.exe (Windows Accessibility Infrastructure) resolves AT configuration from the per-user ATConfig path but performs unsafe file/registry operations. A registry symlink race condition in the ATConfig handling lets a local attacker write arbitrary values into protected HKLM keys and redirect the configuration load to a malicious AT entry, leading to arbitrary code execution as SYSTEM. The steps performed by the exploit are: Write target value to ATConfig registry path Set oplock on oskmenu.xml Lock workstation Wait for oplock (user interaction) Start target service (run agent as SYSTEM)