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             AUSCERT External Security Bulletin Redistribution

              St. Jude Merlin@home Transmitter Vulnerability
                              8 February 2017


        AusCERT Security Bulletin Summary

Product:           Merlin@home
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-5149  

Original Bulletin: 

Revision History:  February  8 2017: Five (5) parts updated of initial advisory.
                   January  10 2017: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Advisory (ICSMA-17-009-01A)

St. Jude Merlin@home Transmitter Vulnerability (Update A)

Original release date: January 09, 2017 | Last revised: February 06, 2017

Legal Notice

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This updated advisory is a follow-up to the original advisory titled 
ICSMA-17-009-01 St. Jude Merlin@home Transmitter Vulnerability that was 
published January 9, 2017, on the NCCIC/ICS-CERT web site.

- --------- Begin Update A Part 1 of 5 --------

MedSec Holdings has identified a channel accessible by nonendpoint 
(man-in-the-middle) vulnerability in St. Jude Medical's Merlin@home 
transmitter, which affects both the RF and inductive models. St. Jude Medical
has validated the vulnerability and produced a new software version that 
mitigates this vulnerability. A third-party security research firm has 
verified that the new software version mitigates the identified vulnerability.

- --------- End Update A Part 1 of 5 ----------

This vulnerability could be exploited remotely. An attacker with high skill 
would be able to exploit this vulnerability.

The Food and Drug Administration (FDA) released a safety communication on 
January 9, 2017, Cybersecurity Vulnerabilities Identified in St. Jude Medicals
Implantable Cardiac Devices and Merlin@home Transmitter, to alert users about
the identified vulnerability and corresponding mitigation as well as to 
provide recommendations to patients and healthcare providers. In response, 
ICS-CERT is releasing this advisory to provide additional information to 
patients and healthcare providers.


- --------- Begin Update A Part 2 of 5 --------

The following Merlin@home transmitters are affected:

    Merlin@home, versions prior to Version 8.2.2:
    RF models: EX1150,
    Inductive models: EX1100, and
    Inductive models: EX1100 with MerlinOnDemand capability.

- --------- End Update A Part 2 of 5 ----------


Successful exploitation of this vulnerability may allow a remote attacker to 
access or influence communications between Merlin.net and transmitter 

ICS-CERT recommends that patients and healthcare providers evaluate the impact
of this vulnerability based on their specific usage after reviewing the 
information referenced in this advisory and to contact the vendor for 
assistance with any questions or concerns related to this vulnerability.


St. Jude Medical is a US-based company headquartered in St. Paul, Minnesota.

The affected product, the Merlin@home transmitter, allows for remote care 
management of patients with implanted cardiac devices through scheduled 
transmissions, patient-initiated transmissions, and daily monitoring.

- --------- Begin Update A Part 3 of 5 --------

According to St. Jude Medical, Merlin@home transmitter inductive models can 
have the MerlinOnDemand capability enabled. The MerlinOnDemand capability is a
configuration that allows for multiple-patient use in healthcare facilities. 
The Merlin@home transmitter inductive models, with MerlinOnDemand capability 
enabled, is used by healthcare professionals to read patient Implantable 
Medical Devices (IMDs) data during office visits. Inductive Merlin@home 
transmitters with MerlinOnDemand capability enabled contain the same hardware
and software as other inductive Merlin@home transmitters, but with slightly 
different capability, resulting from a different configuration on the 
server/Merlin.net side, which is controlled by St. Jude Medical. The 
Merlin@home transmitter inductive model with the MerlinOnDemand capability 
enabled is set up to pair with multiple IMDs, which differs from the 
Merlin@home transmitter that has not enabled this capability, as it is 
intended for home use. Also, the Merlin@home transmitter inductive model with
MerlinOnDemand capability enabled does not use RF to communicate with IMDs. 
Instead, it uses close range impedance telemetry.

According to St. Jude Medical, the Merlin@home transmitter inductive models 
are deployed across the Healthcare and Public Health sector. St. Jude Medical
estimates that Merlin@home transmitters inductive models, with MerlinOnDemand
capability enabled, correspond to approximately 0.1 percent of the total 
Merlin@home transmitters available and that these products are used worldwide.

- --------- End Update A Part 3 of 5 ----------




- --------- Begin Update A Part 4 of 5 --------

The identities of the endpoints for the communication channel between the 
transmitter and St. Jude Medicals web site, Merlin.net, are not verified. This
may allow a remote attacker to access or influence communications between the
identified endpoints.

- --------- End Update A Part 4 of 5 ----------

CVE-2017-5149[b] has been assigned to this vulnerability. A CVSS v3 base score 
of 8.9 has been assigned; the CVSS vector string is 



This vulnerability could be exploited remotely.


No known public exploits specifically target this vulnerability.


An attacker with high skill would be able to exploit this vulnerability.


- --------- Begin Update A Part 5 of 5 --------

St. Jude Medical has developed an updated software version for all Merlin@home
transmitters, including inductive Merlin@home transmitters with the 
MerlinOnDemand capability, which mitigates the identified vulnerability and 
provides additional security enhancements.

The new version of the transmitter software, Version 8.2.2, will be 
automatically updated over a period of several months, when all models of the
Merlin@home transmitters are connected to an Ethernet, WiFi, cellular network,
or a landline. St. Jude Medical recommends that users keep Merlin@home 
transmitters powered and connected at all times to receive this update and 
future updates.

For additional information about the vulnerability or the software update 
process, users can review information from St. Jude Medical at:

(link is external)

Patients and healthcare providers with questions can call the Merlin hotline 

1-877-696-3754 or visit www.sjm.com/Merlin (link is external) for more 

The FDA issued a safety communication on January 9, 2017, Cybersecurity 
Vulnerabilities Identified in St. Jude Medicals Implantable Cardiac Devices 
and Merlin@home Transmitter, which includes recommendations for patients and 
healthcare providers and is available at the following location:


- --------- End Update A Part 5 of 5 ----------

St. Jude Medical is continuing to work with ICS-CERT and the FDA to address 
additional security issues that have been identified. As additional 
information becomes available, ICS-CERT in coordination with the FDA, will 
release additional information products.

ICS-CERT reminds Internet users that directly connecting any device to the 
Internet without explicitly controlling communication with or access to the 
connected device, significantly increases the risk of a cybersecurity-related

ICS-CERT provides recommended security practices on the ICS-CERT web page at 
http://ics-cert.us-cert.gov/content/recommended-practices. ICS-CERT reminds 
members of the healthcare and public health sector to perform proper impact 
analysis and risk assessment prior to deploying defensive measures.

Additional mitigation guidance and recommended practices are publicly 
available in the ICSCERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation 
Strategies, that is available for download from the ICS-CERT web site 

[a.] CWE-300: Channel Accessible by Non-Endpoint ('Man-in-the-Middle'), 
http://cwe.mitre.org/data/definitions/300.html, web site last accessed January
9, 2017.

[b.] NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-5149, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

[c.] CVSS Calculator, 
web site last accessed January 9, 2017.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:


ICS-CERT 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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