CVE-2023-3181

Summary

The C:\Program Files (x86)\Splashtop\Splashtop Software Updater\uninst.exe process creates a folder at C:\Windows\Tempnsu.tmp and copies itself to it as Au_.exe. The C:\Windows\Tempnsu.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 Software

Weaknesses

• CWE-379: CWE-379: Creation of Temporary File in Directory with Insecure Permissions

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

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

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