CVE-2023-3181

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.

CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-379 CWE-379

Affected Products

Vendor	Product	Versions
splashtop	mirroring360_receiver	< 2.4.0.1
splashtop	mirroring360_sender	< 1.3.0.0
splashtop	splashtop	< 3.5.6.0
splashtop	splashtop	< 3.5.8.0
splashtop	splashtop_for_rmm	< 3.5.8.0
splashtop	streamer	< 3.5.6.0
microsoft	windows	All

References

Other 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

Frequently Asked Questions

What is CVE-2023-3181? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-3181? +

CVE-2023-3181 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-3181? +

CVE-2023-3181 affects products from microsoft, splashtop, specifically: mirroring360_receiver, mirroring360_sender, splashtop, splashtop_for_rmm, streamer, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-3181? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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