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TLP:WHITE

Advisory (ICSMA-18-123-01)

Philips Brilliance Computed Tomography (CT) System

Original release date: May 03, 2018

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1. EXECUTIVE SUMMARY

  • CVSS v3 8.4
  • ATTENTION: Low skill level to exploit.
  • Vendor: Philips
  • Equipment: Brilliance CT Scanners
  • Vulnerabilities: Execution with Unnecessary Privileges, Exposure of Resource to Wrong Sphere, Use of Hard-coded Credentials

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow an attacker to attain elevated privileges and access unauthorized system resources, including access to execute software or to view/update files including patient health information (PHI), directories, or system configuration. This could impact system confidentiality, system integrity, or system availability. Philips has received no reports of exploitation or incidents from clinical associated with these vulnerabilities.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Philips reports that the vulnerabilities affect the following Brilliance CT Scanners:

  • Brilliance 64 version 2.6.2 and below,
  • Brilliance iCT versions 4.1.6 and below,
  • Brillance iCT SP versions 3.2.4 and below, and
  • Brilliance CT Big Bore 2.3.5 and below.

3.2 VULNERABILITY OVERVIEW

3.2.1   EXECUTION WITH UNNECESSARY PRIVILEGES CWE-250

Philips Brilliance CT devices operate user functions from within a contained kiosk in a Microsoft Windows operating system. Windows boots by default with elevated Windows privileges, enabling a kiosk application, user, or an attacker to potentially attain unauthorized elevated privileges. Also, attackers may gain access to unauthorized resources from the underlying Windows operating system.

CVE-2018-8853 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L).

3.2.2   EXPOSURE OF RESOURCE TO WRONG SPHERE CWE-668

Vulnerabilities within the Brilliance CT kiosk environment could enable a limited-access kiosk user or an unauthorized attacker to break-out from the containment of the kiosk environment, attain elevated privileges from the underlying Windows OS, and access unauthorized resources from the operating system.

CVE-2018-8861 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L).

3.2.3   USE OF HARD-CODED CREDENTIALS CWE-798

The software contains fixed credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. An attacker could compromise these credentials and gain access to the system.

CVE-2018-8857 has been assigned to this vulnerability. A CVSS v3 base score of 8.4 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

  • Critical Infrastructure Sectors: Healthcare and public Health
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: U.S.

3.4 RESEARCHER

Philips reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Philips has identified the following guidance and controlling risk mitigations:

  • Users should operate all Philips deployed and supported Brilliance CT products within Philips authorized specifications, including Philips approved software, software configuration, system services, and security configuration such as firewall operations.
  • Philips also recommends users implement a comprehensive, multi-layered strategy to protect their systems from internal and external security threats, including restricting physical access of the scanner to only authorized personnel, thus reducing the risk of physical access being compromised by an unauthorized user.

Philips has also remediated hard-coded credential vulnerabilities for Brilliance iCT 4.x and above versions. The Philips iCT-iPatient (v4.x) family Instructions for Use (IFU) refers to the ability to manage credentials and is accessible from Philips InCenter at https://incenter.medical.philips.com for entitled users.

Philips will be further assessing options for remediation with future product introductions and/or upgrades across the Brilliance CT modality to address these identified security vulnerabilities. Users with questions about their specific Brilliance CT product should contact their local Philips service support team or their regional service support. Contact information is available at the following location:

http://www.usa.philips.com/healthcare/solutions/customer-service-solutions

The Philips’ advisory is available at the following URL:

http://www.philips.com/productsecurity (link is external)

NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should follow these measures:

NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

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

Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.

No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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