(PT-2018-02) Positive Technologies Security Advisory
Improper Authorization in PHOENIX CONTACT FL SWITCH

Vulnerable products

PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx
Version: 1.32 and earlier

Link:
https://www.phoenixcontact.com/

Severity level

Severity level: High
Impact: Privilege Gaining
Access Vector: Remote

CVSS v3:
Base Score: 9.8
Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

CVE: CVE-2017-16743

Vulnerability description

The specialists of the Positive Research center have detected an Improper Authorization vulnerability in PHOENIX CONTACT FL SWITCH.

An Improper Authorization issue in PHOENIX CONTACT FL SWITCH products allows remote unauthenticated attackers to bypass web-service authentication and obtain administrative privileges on the device via specially crafted HTTP requests.

How to fix

Update firmware to the latest version

Advisory status

02.08.2017 - Vendor gets vulnerability details
11.01.2018 - Vendor releases fixed version and details
22.01.2018 - Public disclosure

Credits

The vulnerability was detected by Ilya Karpov and Evgeniy Druzhinin, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2018-02
https://ics-cert.us-cert.gov/advisories/ICSA-18-011-03
https://cert.vde.com/de-de/advisories/vde-2017-006

Reports on the vulnerabilities previously discovered by Positive Research:

https://www.ptsecurity.com/
https://en.securitylab.ru/lab/

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.