ESB-2018.2283 - [Appliance] Medtronic MyCareLink 24950 Patient Monitor: Multiple vulnerabilities 2018-08-08

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2283
        Multiple vulnerabilities have been identified in Medtronic
                     MyCareLink 24950 Patient Monitor
                               8 August 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Medtronic MyCareLink 24950 Patient Monitor
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data         -- Console/Physical
                   Provide Misleading Information -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10626 CVE-2018-10622 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-219-01

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Advisory (ICSMA-18-219-01)

Medtronic MyCareLink 24950 Patient Monitor

Original release date: August 07, 2018

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1. EXECUTIVE SUMMARY

CVSS v3 4.9

Vendor: Medtronic

Equipment: MyCareLink Patient Monitor

Vulnerabilities: Insufficient Verification of Data Authenticity, Storing 
Passwords in a Recoverable Format

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow an attacker with 
physical access to obtain per-product credentials that are utilized to 
authenticate data uploads and encrypt data at rest. Additionally, an attacker
with access to a set of these credentials and additional identifiers can 
upload invalid data to the Medtronic CareLink network.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of the Medtronic MyCareLink 24950 Patient Monitor, are
affected:

24950 MyCareLink Monitor, all versions,

24952 MyCareLink Monitor, all versions.

3.2 VULNERABILITY OVERVIEW

3.2.1 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY CWE-345

The affected products update service does not sufficiently verify the 
authenticity of the data uploaded. An attacker who obtains per-product 
credentials from the monitor and paired implantable cardiac device information
can potentially upload invalid data to the Medtronic CareLink network.

CVE-2018-10626 has been assigned to this vulnerability. A CVSS v3 base score 
of 4.4 has been calculated; the CVSS vector string is 
(AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N).

3.2.2 STORING PASSWORDS IN A RECOVERABLE FORMAT CWE-257

The affected products use per-product credentials that are stored in a 
recoverable format. An attacker can use these credentials for network 
authentication and encryption of local data at rest.

CVE-2018-10622 has been assigned to this vulnerability. A CVSS v3 base score 
of 4.9 has been calculated; the CVSS vector string is 
(AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health

COUNTRIES/AREAS DEPLOYED: Worldwide

COMPANY HEADQUARTERS LOCATION: Ireland

3.4 RESEARCHER

Billy Rios, Jesse Young, and Jonathan Butts of Whitescope LLC reported these 
vulnerabilities to NCCIC.

4. MITIGATIONS

Medtronic has made server-side updates to address the insufficient 
verification vulnerability identified in this advisory. Medtronic is 
implementing additional server-side mitigations to enhance data integrity and
authenticity.

Medtronic recommends users take additional defensive measures to minimize the
risk of exploitation. Specifically, users should:

Maintain good physical control over the home monitor.

Only use home monitors obtained directly from their healthcare provider or a 
Medtronic representative to ensure integrity of the system.

Medtronic has released additional patient focused information, at the 
following location:

https://www.medtronic.com/security

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

Do not upload and run files without verifying the integrity of the file.

Interact with, and only obtain files, software, and software patches from 
trustworthy reputable sources.

Minimize network exposure for all medical devices and/or systems, and ensure 
that they are not accessible from the Internet.

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. High skill level is needed to 
exploit.

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?

The NCCIC continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

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