Miele Professional PG 8528 Vulnerability

NCCIC/ICS-CERT is aware of a public report of a directory traversal vulnerability with proof-of-concept (PoC) exploit code affecting the embedded webserver (“PST10 WebServer”) in Miele Professional PG 8528, a large capacity washer and disinfector used in hospitals and laboratory settings to disinfect medical and laboratory equipment. According to this report, the vulnerability is remotely exploitable.
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SUMMARY

NCCIC/ICS-CERT is aware of a public report of a path traversal vulnerability with proof-of-concept (PoC) exploit code affecting the embedded webserver (“PST10 WebServer”) in Miele Professional PG 8528, a large capacity cleaner and disinfector used in hospitals and laboratory settings to disinfect medical and laboratory equipment. According to this report, the vulnerability is remotely exploitable.

Researcher Jens Regel released this report without coordination with ICS-CERT. Miele has confirmed the vulnerability and is working on mitigations. ICS-CERT is issuing this alert to provide early notice of the report and identify baseline mitigations for reducing risks to these and other cybersecurity attacks.

The report included vulnerability details and PoC exploit code for the following vulnerability:

For details, please see Miele’s press release:

https://www.miele.de/en/m/miele-admits-communication-glitch-4072.htm

FOLLOW-UP

ICS-CERT released the follow-up advisory titled ICSA-17-138-01 Miele Professional PG 85 Series on May 18, 2017, on the ICS-CERT web site.

MITIGATION

ICS-CERT is currently coordinating with the vendor and security researcher to identify mitigations. Miele is currently developing updated firmware to address this vulnerability which will be available within a matter of weeks.

ICS-CERT recommends, as quality assurance, that users test the update in a test development environment that reflects their production environment prior to installation. In addition, users should:

• Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
• Locate control system networks and devices behind firewalls, and isolate them from the business network.
• When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.

ICS-CERT also provides a control systems recommended practices page on the ICS-CERT web site. Several recommended practices are available for reading or download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

Organizations that observe any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.