CVSS v3 8.8
ATTENTION: Exploitable remotely/low skill level to exploit
Successful exploitation of this vulnerability could allow unauthorized users full access to the device configuration.
Phoenix Contact reports the vulnerability affects the following FL NAT SMx industrial Ethernet switches:
An unauthorized user can access the web interface using an authorized IP address, which may allow full access to the device configuration. This attack is only possible if an authorized session is still active on the system.
CERT@VDE, working with Maxim Rupp and Phoenix Contact, reported this vulnerability to NCCIC.
Phoenix Contact recommends affected users operate the devices in closed networks or protected with a suitable firewall.
Phoenix Contact recommends that users consider the following steps to protect the device from an attacker who has gained access to the closed network, or if there is a possibility that multiple users might share a VPN connection with a single endpoint IP:
Additional recommendations can be found within the following application note:
Please see VDE-2019-006 at the following location for more details:
NCCIC notes that the SNMP mitigation strategy introduces new risk into the system because of known vulnerabilities within SNMP v2c. NCCIC recommends those using the SNMP mitigation strategy implement the following best practices:
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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