Vulnerability Alert

Triangle Research Nano-10 PLC Denial of Service

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:29981
Version:1
First Published:2013 July 09 13:28 GMT
Last Published:2013 July 09 13:28 GMT
Port: Not available
CVE:CVE-2013-2784
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.8
 
Version Summary: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.
 
 
Description
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.
 
Warning Indicators
All firmware versions of Nano-10 PLC prior to r81 are vulnerable.
 
IntelliShield Analysis
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.
 
Vendor Announcements
ICS-CERT has re-released a security advisory at the following link: ICSA-13-189-02
 
Impact
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.
 
Technical Information
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.
 
Safeguards
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.
 
Patches/Software
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.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
IntelliShieldSecurity Activity Bulletin Original Release Base

Associated Products:
N/A




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