CVE-2023-3181: Insecure Permissions in Splashtop Software Updater

The C:\Program Files (x86)\Splashtop\Splashtop Software Updater\uninst.exe process creates a folder at C:\Windows\Temp~nsu.tmp and copies itself to it as Au.exe. The C:\Windows\Temp~nsu.tmp\Au.exe file is automatically launched as SYSTEM when the system reboots or when a standard user runs an MSI repair using Splashtop Streamer’s Windows Installer. Since the C:\Windows\Temp~nsu.tmp folder inherits permissions from C:\Windows\Temp and Au.exe is susceptible to DLL hijacking, standard users can write a malicious DLL to it and elevate their privileges.