Product Cryptomato
Vendor Skymatic GmbH
Affected Versions <=1.9.1
Tested Versions 1.9.1
Subject Improper Privilege Management - CWE-269
Risk Level Medium
Solution Status Fixed
Manufacturer Notification Jul 20 2023
Solution Date Jul 24 2023
Public Disclosure Jul 24 2023
CVE Reference CVE-2023-37907
Author Matthias Zöllner, Cyvisory Group GmbH


The MSI installer provided on the homepage allows LPE for low privileged users, via the repair function.


The problem occurs, as the repair function of the MSI is spawning two administrative cmds. If caught, a simple LPE is possible via a very simple breakout.

Proof of Concept (PoC)

As a low privileged user do the following steps to reproduce:

  • Locate the msi installer under c:\windows\installer\ . The installer gets cached here for almost forever. To easily locate the installer, use either the timestamp or the script from Mandiant:

  • Run the located installer with msiexec.exe /fa C:\Windows\Installer\2847d63.msi

  • When the installer runs, note that there are two cmd windows flickering.

  • Catch the cmd, by quickly selecting some text

  • Spawn a new SYSTEM cmd via: cmd -> properties -> “legacy console mode” Link -> Internet Explorer -> CTRL+O -> cmd.exe

Alt text Alt text


Local Elevation of Privileges. On every machine, where the msi installer still can be found or can be brought to.

Workaround / Fix

It should be able to add a WixQuietExec to the custom action.

Disclosure Timeline

2023-07-20: Vulnerability discovered
2023-07-20: Vulnerability reported to manufacturer
2023-07-24: Fixed by vendor
2023-08-01: Public disclosure of vulnerability



Found and reported by Matthias Zoellner from Cyvisory Group GmbH

E-Mail: [email protected]


The information provided in this security advisory is provided “as is” and without warranty of any kind.