CVE-2017-16743 Auth bypass in PHOENIX CONTACT FL SWITCH

Critical 9.8 Published 12 Jan 2018 Updated 5 Aug 2024

Remote attackers can bypass web-service authentication to gain administrative privileges on PHOENIX CONTACT industrial switches.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2017-16743?

CVE-2017-16743 is a critical authentication bypass vulnerability in PHOENIX CONTACT FL SWITCH, published on 12 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improper Authorization issue was discovered in PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx Series products running firmware Version 1.0 to 1.32. A remote unauthenticated attacker may be able to craft special HTTP requests allowing an attacker to bypass web-service authentication allowing the attacker to obtain administrative privileges on the device.

Weakness: CWE-863, CWE-285

Which versions are affected by CVE-2017-16743?

It affects 29 products.

Products include Phoenixcontact Fl Switch 3004t-Fx Firmware, Phoenixcontact Fl Switch 3004t-Fx St Firmware, Phoenixcontact Fl Switch 3005 Firmware, Phoenixcontact Fl Switch 3005t Firmware, Phoenixcontact Fl Switch 3006t-2fx Firmware, Phoenixcontact Fl Switch 3006t-2fx Sm Firmware and 23 more.

How do I fix CVE-2017-16743?

No fix has been published for CVE-2017-16743 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2017-16743 being exploited?

There is no known exploitation of CVE-2017-16743 in the wild and no public exploit code.

Sources

Also known as GHSA-xp4q-qhv3-758q.