An update is available to mitigate an uncontrolled resource consumption vulnerability in Siemens’ SINAMICS, according to a report with CISA.

Successful exploitation of this remotely exploitable vulnerability, which Siemens self-reported, may allow an attacker to perform a denial-of-service attack.

The webserver of the affected devices contains a vulnerability that may lead to a denial-of-service condition. An attacker may cause a denial-of-service situation, leading to a restart of the webserver of the affected device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction.

CVE-2019-6568 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.5.

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Siemens reports the vulnerability affects webservers of the following industrial products:
• SINAMICS GH150 v4.7 (Control Unit): All versions
• SINAMICS GH150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF6
• SINAMICS GL150 v4.7 (Control Unit): All versions
• SINAMICS GL150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF7
• SINAMICS GM150 v4.7 (Control Unit): All versions
• SINAMICS GM150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF9
• SINAMICS SL150 v4.7 (Control Unit): All versions
• SINAMICS SL150 v4.8 (Control Unit): All versions
• SINAMICS SM120 v4.7 (Control Unit): All versions
• SINAMICS SM120 v4.8 (Control Unit): All versions
• SINAMICS SM150 v4.8 (Control Unit): All versions

The product sees use in the chemical, commercial gacilities, critical manufacturing, energy, food and agriculture, healthcare and public health, transportation systems, and water and wastewater systems sectors. The product sees action on a global basis.

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

Siemens recommends users update to v4.8 SP2 HF9. The update can be obtained from a Siemens representative or via Siemens customer service.

In addition, Siemens identified the following specific workarounds and mitigations users can apply to reduce the risk:
1. Restrict network access to the integrated webserver.
2. Deactivate the webserver if not required, and if deactivation is supported by the product. For SINAMICS products, webserver may be deactivated with parameter P8986 = 0

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

Click here for additional information on industrial security by Siemens.

For more information on the vulnerability and more detailed mitigation instructions, see Siemens Security Advisory SSA-530931.

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