SUPREMO Privilege Escalation

Credit: Victor Gil
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Details ======= Subject: Local Privilege Escalation Product: SUPREMO by Nanosystems S.r.l. Vendor Homepage: Vendor Status: fixed version released Vulnerable Version: (No other version was tested, but it is believed for the older versions to be also vulnerable.) Fixed Version: CVE Number: CVE-2020-25106 CVE URL: 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 ( 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 -- *A2secure* QSA auditors - Pentesting - Security Consultancy - Forensic Analysis - PCI Consultancy - Malware Analysis - Incident Response - Security Office - Security Training - Employee Security Awareness Este mensaje de correo electrónico y sus archivos adjuntos son confidenciales y están legalmente protegidos. Se dirige exclusivamente al destinatario o destinatarios. No está autorizado el acceso a este mensaje por otras personas. Si Vd. no es la persona a la que va dirigido este email, cualquier uso está prohibido y es ilegal. Asímismo, de acuerdo al Reglamento EU 2016/679 sobre Protección de Datos Personales, le informamos que su dirección e-mail forma parte de los ficheros de las empresas de A2secure, S.L. (A2SECURE) con CIF: B65040107, porque en su momento nos autorizó el tratamiento para mantener una relación comercial y/o informativa de nuestros productos y servicios; Usted puede ejercer en cualquier momento sus derechos de acceso, rectificación, supresión, limitación y oposición dirigiéndose por escrito a Avda. Francesc Cambo 21, 10, 08003 Barcelona. Tel.: +34 93 3945600, Email: <>. Si ha recibido este mensaje por error, por favor, destrúyalo y notifíquelo. Gracias. This message and its annexed files may contain confidential information which is exclusively for the use of the addressee. Access to this message by other people is not authorized. If you are not the person to whom it is addressed, any use, treatment, information, copy or distribution and any action or omission based on the information contained in this message are strictly forbidden and illegal. According to Regulation EU 2016/679 on Protection of Personal Data, we inform you that your e-mail address is part of the files of the companies of A2secure, S.L. (A2SECURE) with CIF: B65040107, because at some moment you authorized us the treatment to maintain a commercial and / or informative relationship of our products and services; You can exercise your rights of access, rectification, erasure, restriction and object at any time by writing to Avda. Francesc Cambo 21, 10, 08003 Barcelona. Tel .: +34 93 3945600, Email: <>. If you have received this message by mistake, please destroy it and notify it. Thank you.

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