Martem Updates TELEM-GW6/GWM Fix

Thursday, August 30, 2018 @ 04:08 PM gHale

Martem has an update to the mitigations for multiple vulnerabilities in its TELEM-GW6/GWM, according to a report with NCCIC.

The vulnerabilities, discovered by Bernhards Blumbergs and Arturs Danilevics of CERT.LV, Latvia, include a missing authentication for critical function, incorrect default permissions, resource exhaustion, and cross-site scripting.

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This updated advisory is a follow-up to the original advisory that published May 22, NCCIC officials said.

Successful exploitation of these vulnerabilities could allow execution of unauthorized industrial process control commands, full control over RTU, denial of service, or client-side code execution.

The following TELEM products with insecure configurations suffer from the vulnerabilities:
• GW6 versions prior to 2.0.87-4018403-k4
• GWM versions prior to 2.0.87-4018403-k4

Not all versions are affected by all vulnerabilities.

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, using default credentials to connect to the RTU, an unprivileged user may modify/upload a new system configuration or take the full control over the RTU.

CVE-2018-10605 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 8.8.

Also, 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.

In addition, 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 mainly 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 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)
• Using secure VPN channels
• Proper packet filtering by enabling firewall in RTU configuration. Note that the “interface” field of every communication channel must be properly set in RTU configuration when firewall is enabled

See Martem Security Advisory SA1805182 and SA1805184.

Martem recommends the following mitigations for CVE-2018-10605:
• Upgrade to new firmware release 2.0.87-4018403- k4 or newer
• Change default passwords to reasonably strong ones
• Implement firewall rules to limit unsanctioned SSH access for IPv4 and IPv6
• Use SSH public key authorization
• Ensure GWS.exe is up to date

Click here for Martem Security Advisory SA1805183.

Martem recommends the following mitigations for CVE-2018-10609:
• Upgrade to firmware 2.0.72-cb42e64-k4 or newer. 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.

See Martem Security Advisory SA1805181.



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