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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-25 · updated 2026-06-17
• Weakness: CWE-379

Description

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.

Affected products

• Splashtop Mirroring360 Receiver: before 2.4.0.1 — fixed in 2.4.0.1
• Splashtop Mirroring360 Sender: before 1.3.0.0 — fixed in 1.3.0.0
• Splashtop: before 3.5.6.0; before 3.5.8.0 — fixed in 3.5.6.0, 3.5.8.0
• Splashtop For Rmm: before 3.5.8.0 — fixed in 3.5.8.0
• Splashtop Streamer: before 3.5.6.0 — fixed in 3.5.6.0

How to fix

Upgrade to a fixed version: Splashtop Mirroring360 Receiver 2.4.0.1; Splashtop Mirroring360 Sender 1.3.0.0; Splashtop 3.5.6.0, 3.5.8.0; Splashtop For Rmm 3.5.8.0; Splashtop Streamer 3.5.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2023/MNDT-2023-0015.md
• https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2023/MNDT-2023-0015.md

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