PT-2018-32: Arbitrary Code Execution in NCR S1

Vulnerable product



Severity level

Severity level: High
Impact: Remote code execution, firmware downgrade
Access Vector: Remote

CVSS v3:
Base Score: 7.5
Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVE: CVE-2017-17668

Vulnerability description

The specialists of the Positive Research center have detected an Arbitrary Code Execution vulnerability in NCR S1.

Vulnerability in the NCR S1 Dispenser controller, related to insufficient protection of the memory write mechanism, allows unauthenticated, remote attackers to execute arbitrary code or downgrade the firmware of the device, including to older versions with known vulnerabilities.

How to fix

Use vendor's advisory:

Advisory status

23.06.2017 - Vendor gets vulnerability details
06.02.2018 - Vendor releases fixed version and details
14.12.2018 - Public disclosure


The vulnerability was detected by Vladimir Kononovich, Alexey Stennikov, Positive Research Center (Positive Technologies Company)


About Positive Technologies

Positive Technologies is a leading digital security firm with over 15 years of experience in 360° protection of critical IT systems against the most advanced cyberthreats. State-of-the-art solutions are developed at the company's research center—one of the largest in Europe. Positive Technologies experts have helped to identify and fix over 250 zero-day vulnerabilities in products from Cisco, Google, Honeywell, Huawei, Microsoft, Oracle, SAP, Schneider Electric, Siemens, and others, earning a reputation for world-class expertise in protection of devices and infrastructures at all scales from ATMs to nuclear power stations. Findings by Positive Technologies researchers are used for updating the MaxPatrol knowledge base and for development of security solutions including PT Application Firewall, PT Application Inspector, MaxPatrol. These products allow securing web applications, evaluating network protection, blocking attacks in real time, ensuring compliance with industry and national standards, and training security specialists. Positive Technologies is the organizer of the annual Positive Hack Days international forum and security competition.