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Siemens has a new version to mitigate cleartext transmission of sensitive information, a cross-site scripting and a cross-site request forgery in its CP1604 and CP1616, according to a report with NCCIC.

Successful exploitation of these remotely exploitable vulnerabilities could result in a denial-of-service condition and information exposure. An attacker could inject arbitrary JavaScript in a specially crafted URL request to execute on unsuspecting user’s systems, allowing an attacker to trigger actions via the web interface that a legitimate user is allowed to perform.

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CP 1604 and 1616: All versions prior to v2.8 suffer from the issues, which Siemens self-reported.

In one vulnerability, an attacker with network access to Port 23/TCP could extract internal communication data or cause a denial-of-service condition.

Cyber Security

CVE-2018-13808 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.1.

In addition, the integrated web server of the affected CP devices could allow cross-site scripting (XSS) attacks if unsuspecting users are tricked into following a malicious link.

CVE-2018-13809 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.1.

Also, the integrated configuration web server of the affected CP devices could allow a cross-site request forgery (CSRF) attack if an unsuspecting user is tricked into accessing a malicious link.

CVE-2018-13810 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 4.3.

The products see use mainly in the chemical, critical manufacturing, energy, food and agriculture, and water and wastewater systems sectors. They also see action on a global basis.

No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the vulnerabilities.

Siemens recommends users update to version 2.8.

Siemens identified the following specific workarounds and mitigations users can apply to reduce the risk:
• Disable the integrated web server. The web server is disabled in the default settings and its use is optional. Use in a productive environment is discouraged.
• Restrict access to the device to the internal or VPN network. Further restrict access to the web interface (80/TCP) and to the telnet port (23/TCP) to trusted IP addresses if possible.
• Do not click on links from unknown sources.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security, and following the recommendations in the product manuals.

Click here for additional information on industrial security by Siemens.

For more information on these vulnerabilities and associated software updates, see Siemens security advisory SSA-559174.

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