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Splashtop 8.71.12001.0 contains an unquoted service path vulnerability in the Splashtop Software Updater Service that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in C:\Program Files (x86)\Splashtop\Splashtop Software Updater\ to inject malicious executables and escalate privileges.
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.
The MSI installer for Splashtop Streamer for Windows before 3.6.0.0 uses a temporary folder with weak permissions during installation. A local user can exploit this to escalate privileges to SYSTEM by placing a version.dll file in the folder.
The MSI installer for Splashtop Streamer for Windows before 3.5.8.0 uses a temporary folder with weak permissions during installation. A local user can exploit this to escalate privileges to SYSTEM by placing a wevtutil.exe file in the folder.
The MSI installer for Splashtop Streamer for Windows before 3.6.2.0 uses a temporary folder with weak permissions during installation. A local user can exploit this to escalate privileges to SYSTEM by replacing InstRegExp.reg.
Splashtop Streamer through 3.4.8.3 creates a Temporary File in a Directory with Insecure Permissions.
Splashtop Remote Client (Personal Edition) through 3.4.6.1 creates a Temporary File in a Directory with Insecure Permissions.
Splashtop Remote Client (Business Edition) through 3.4.8.3 creates a Temporary File in a Directory with Insecure Permissions.
The MSI installer for Splashtop Streamer for Windows before 3.7.0.0 uses a temporary folder with weak permissions during installation. A local user can exploit this to escalate privileges to SYSTEM via an oplock on CredProviderInst.reg.
A Windows privilege change issue was discovered in Splashtop Software Updater before 1.5.6.16. Insecure permissions on the configuration file and named pipe allow for local privilege escalation to NT AUTHORITY/SYSTEM, by forcing a permission change to any Splashtop files and directories, with resultant DLL hijacking. This product is bundled with Splashtop Streamer (before 3.3.8.0) and Splashtop Business (before 3.3.8.0).