ESB-2018.1900 - [Appliance] Medtronic MyCareLink Patient Monitor: Multiple vulnerabilities 2018-06-29

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1900
  Serious vulnerabilities patched in Medtronic MyCareLink Patient Monitor
                               29 June 2018

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        AusCERT Security Bulletin Summary
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Product:           Medtronic MyCareLink Patient Monitor
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Console/Physical
                   Increased Privileges            -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8870 CVE-2018-8868 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-179-01

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Advisory (ICSMA-18-179-01)

Medtronic MyCareLink Patient Monitor

Original release date: June 28, 2018

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1. EXECUTIVE SUMMARY

  * CVSS v3 6.4
  * Vendor: Medtronic 
  * Equipment: MyCareLink Patient Monitor
  * Vulnerabilities: Use of Hard-coded Password, Exposed Dangerous Method or
    Function

2. RISK EVALUATION

If exploited, these vulnerabilities may allow privileged access to the
monitor's operating system. However, physical access to the MyCareLink monitor
is required. Additionally, these vulnerabilities may allow a MyCareLink
monitor, when operated within close physical proximity of an implantable
cardiac device, to read and write arbitrary memory values of that device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following MyCareLink Monitors are affected:

  * 24950 MyCareLink Monitor, all versions,
  * 24952 MyCareLink Monitor, all versions.

3.2 VULNERABILITY OVERVIEW

3.2.1    USE OF HARD-CODED PASSWORD CWE-259

The affected product contains a hard-coded operating system password. An
attacker with physical access can remove the case of the device, connect to the
debug port, and use the password to gain privileged access to the operating
system

CVE-2018-8870 has been assigned to this vulnerability. A CVSS v3 base score of
6.4 has been assigned; the CVSS vector string is (AV:P/AC:H/PR:N/UI:N/S:U/C:H/
I:H/A:H).

3.2.2    EXPOSED DANGEROUS METHOD OR FUNCTION CWE-749

The affected product contains debug code meant to test the functionality of the
monitor?s communication interfaces, including the interface between the monitor
and implantable cardiac device. An attacker with physical access to the device
can apply the other vulnerabilities within this advisory to access this debug
functionality. 

This debug functionality provides the ability to read and write arbitrary
memory values to implantable cardiac devices via inductive or short range
wireless protocols. An attacker with close physical proximity to a target
implantable cardiac device can use this debug functionality.

CVE-2018-8868 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been assigned; the CVSS vector string is (AV:P/AC:H/PR:L/UI:N/S:C/C:H/
I:L/A:L).

3.3 BACKGROUND

  * CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
  * COUNTRIES/AREAS DEPLOYED: Worldwide
  * COMPANY HEADQUARTERS LOCATION: Dublin, Ireland

3.4 RESEARCHER

Peter Morgan of Clever Security reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Medtronic will release several rolling over-the-air product updates that will
mitigate the vulnerabilities described within this advisory. These updates will
be applied to devices automatically as part of standard, reoccurring update
processes. In addition, Medtronic has increased security monitoring of affected
devices and related infrastructure. 

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

  * Maintain good physical controls over the home monitor as the best
    mitigation to these vulnerabilities.  
  * Only use home monitors obtained directly from their healthcare provider or
    a Medtronic representative to ensure integrity of the system. 
  * Report any concerning behavior regarding their home monitor to their
    healthcare provider or a Medtronic representative. 

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 this vulnerability. Specifically, 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 remote 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.

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.

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