PT-2018-02: 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 provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit www.ptsecurity.com

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+

Threatscape