Triangle Research Nano-10 PLC firmware contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
A vulnerability in the Nano-10 programmable logic controller (PLC) could cause a denial of service (DoS) condition on a targeted device.
The vulnerability exists because the affected software does not perform sufficient boundary checks on user-supplied input when processing TCP packets. An unauthenticated, remote attacker could exploit the vulnerability by submitting malicious TCP packets to the targeted device. A successful exploit could allow the attacker to cause the targeted application to become inaccessible from the network, resulting in a DoS condition.
Triangle Research International, Inc. has confirmed the vulnerability and suggested that customers contact them for a firmware upgrade.
All firmware versions of Nano-10 PLC prior to r81 are vulnerable.
To exploit this vulnerability, an attacker must send a stream of crafted packets to the vulnerable device, which will likely require the attacker to access protected networks. An exploit could cause the device to be inaccessible and would require a manual reboot.
This vulnerability could be exploited remotely only if the firewall has TCP port 502 open, allowing packets to be passed to the PLC.
ICS-CERT has re-released a security advisory at the following link: ICSA-13-189-02
Successful exploitation of this vulnerability could cause the device to become inaccessible from the network and could only recover with a manual reboot, compromising availability of the device.
The impact of an exploit to individual organizations depends on many factors as the Nano-10 PLC is typically used within varied automated manufacturing equipment ranging from agriculture to transportation systems to HVAC systems.
The vulnerability exists because the Nano-10 PLC fails to sufficiently sanitize incoming Modbus/TCP packets.
An unauthenticated, remote attacker could exploit the vulnerability by sending a crafted packet to TCP port 502 of the PLC. Processing such a packet could cause the device to become inaccessible from the network and it might only be recoverable with a manual reboot, resulting in a DoS condition for legitimate users.
Administrators are advised to contact Triangle Research International for firmware upgrade.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
According to the vendor, the Nano-10 PLC operating system firmware is not field upgradable; therefore, the vendor suggests customers return the affected PLC for an upgrade to resolve the vulnerability.
The security vulnerability applies to the following combinations of products.
Security Activity Bulletin
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