WAGO Mitigates Bypass Vulnerability

Monday, December 26, 2016 @ 10:12 AM gHale

WAGO created firmware and workarounds to mitigate an authentication bypass vulnerability in its Ethernet Web-based Management products, according to a report with ICS-CERT.

This vulnerability, discovered by independent researcher Maxim Rupp, is remotely exploitable.

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WAGO reports the vulnerability affects the following products:
• WAGO 750-8202/PFC200 prior to FW04 (released August 2015)
• WAGO 750-881 prior to FW09 (released August 2016)
• WAGO 0758-0874-0000-0111

An attacker who exploits this vulnerability could be able to view and edit settings without authenticating.

WAGO is an international company based in Germany. They operate production facilities in Germany, Switzerland, Poland, China, and India. WAGO maintains offices worldwide.

WAGO’s products see action across several sectors including commercial facilities, critical manufacturing, energy, and transportation systems. WAGO estimates these products see use on a global basis.

In the vulnerability, by accessing a specific uniform resource locator (URL) on the web server, a malicious user is able to edit and to view settings without authenticating.

CVE-2016-9362 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.1.

No known public exploits specifically target this vulnerability. However, an attacker with a low skill would be able to exploit this vulnerability.

WAGO recommends the following use conditions for Ethernet devices. If not otherwise specified, Ethernet devices should end up used on local networks. Users should note the following when using Ethernet devices:
• Do not connect control components and control networks to an open network such as the Internet or an office network. WAGO recommends putting control components and control networks behind a firewall.
• Limit physical and electronic access to all automation components to authorized personnel only.
• Change the default passwords before first use. This will reduce the risk of unauthorized access to systems.
• Regularly change passwords. This will reduce the risk of unauthorized access to systems.
• If remote access to control components and control networks is mandatory, use a Virtual Private Network (VPN).
• Regularly perform threat analyses. Check whether the measures taken meet company security requirements.
• Use “defense-in-depth” mechanisms in the system’s security configuration to restrict the access to and control of individual products and networks.



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