SUPREMO 4.1.3.2348 Privilege Escalation

SUPREMO version 4.1.3.2348 suffers from a privilege escalation vulnerability.


MD5 | 1d6af35da40640ddc7679a738507240e

Details
=======

Subject: Local Privilege Escalation
Product: SUPREMO by Nanosystems S.r.l.
Vendor Homepage: https://www.supremocontrol.com/
Vendor Status: fixed version released
Vulnerable Version: 4.1.3.2348 (No other version was tested, but it is
believed for the older versions to be also vulnerable.)
Fixed Version: 4.2.0.2423
CVE Number: CVE-2020-25106
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25106
Authors: Victor Gil (A2SECURE) Adan Alvarez (A2SECURE)

Vulnerability Description
=======

Allows attackers to obtain LocalSystem access because when running as a
service File Manager allows modifying files with system privileges. This
can be used by an adversary to, for example, rename Supremo.exe and then
upload a trojan horse with the Supremo.exe filename.

Proof of Concept
================

To exploit this vulnerability Supremo should be running as a service. Then
follow the following steps:

- Connect to Supremo from a different machine.
- Open File manager.
- Go to the directory where the Supremo executable is located.
- Modify the name of the executable.
- Upload a malicious executable and rename it to Supremo.exe
- Close supremo.

After these steps, as supremo is running as a service, the service
executes, as System, the executable allowing an attacker to elevate
privileges to System.

Fix
===

The vendor provides an updated version (4.2.0.2423)

Timeline
========

2020-07-13 Disclosed to Vendor
2020-10-19 Vendor releases the final patch
2020-12-21 Advisory released

--
*Adan Álvarez*

Security Consultant

+34 933 945 600
[email protected]

--


*A2secure*

QSA auditors - Pentesting - Security Consultancy - Forensic
Analysis - PCI Consultancy - Malware Analysis - Incident Response -
Security Office - Security Training - Employee Security Awareness


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