Martem has updated information on how to mitigate missing authentication for critical function, resource exhaustion, and cross-site scripting vulnerabilities in its TELEM-GW6/GWM, according to a report with NCCIC.
Successful exploitation of these vulnerabilities, discovered by Bernhards Blumbergs and Arturs Danilevics of CERT.LV, Latvia, could allow execution of unauthorized industrial process control commands, denial of service, or client-side code execution.
The following TELEM products with insecure configurations suffer from the remotely exploitable vulnerabilities:
• GW6 Version 2018.04.18-linux_4-01-601cb47 and prior
• GWM Version 2018.04.18-linux_4-01-601cb47 and prior
In one vulnerability, the RTU does not perform authentication of IEC-104 control commands, which may allow a rogue node a remote control of the industrial process.
CVE-2018-10603 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 10.0.
In addition, creating new connections to one or more IOAs, without closing them properly, may cause a denial of service within the industrial process control channel.
CVE-2018-10607 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 8.2.
Also, improper sanitization of data over a Websocket may allow cross-site scripting and client-side code execution with target user privileges.
CVE-2018-10609 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.4.
The product sees use mainly in the energy sector. It also sees action in Estonia, Latvia, Lithuania, and Finland.
No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the vulnerabilities.
Estonia-based Martem has provided updated information within the “Security Considerations” section of their Configuration Manual.
Martem recommends the following mitigations for CVE-2018-10603 and CVE-2018-10607:
In most cases, these vulnerabilities can be resolved by proper configuration:
• Using “other side IP” field in RTU configuration for every TCP/IP channel. This will minimize the risk of allowing unauthorized access and control over the communication channels (i.e., only trusted partners are allowed).
• Use secure VPN channels.
• Proper packet filtering by enabling firewall in RTU configuration. Note the “interface” field of every communication channel must be properly set in RTU configuration when firewall is enabled.
Martem recommends the following mitigations for CVE-2018-10609:
• Upgrade to firmware 2.0.73 or higher. Fixed firmware will be available after 23.05.2018. Contact Martem for more information.
• WebServer should be turned on according to need of the configurator. If the WebServer is not needed anymore, then it should be removed from the configuration.
• WebServer access should be protected by strong password to avoid unauthorized access. Other side IP should be defined in configuration. Use firewall to avoid untrusted connections and to restrict the number of parallel connections to the WebServer.