A vulnerability in WAGO PFC200 Series devices running 3S CoDeSys Runtime could allow an unauthenticated, remote attacker to gain unauthorized access to a targeted device.
The vulnerability is due to improper security restrictions imposed by the affected software. An attacker could exploit this vulnerability by sending crafted TCP packets, via TCP port 2455, to a targeted device. An exploit could allow the attacker to gain unauthorized access to the device, which could result in a complete system compromise.
WAGO has confirmed the vulnerability and released software updates.
CVE Number – CVE-2018-5459
To exploit this vulnerability, an attacker must send crafted TCP packets to the targeted device via TCP port 2455, which is open by default. Administrators are advised to restrict network access to affected devices, allowing only trusted systems and users.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
WAGO has released firmware updates at the following link: PFC200 Series firmware version FW11
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.