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.

Google Inc. AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Google Inc. CWE-379

Google Inc. https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2023/MNDT-2023-0015.md [No types assigned]