-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3404
                    Advisory (icsma-19-248-01) BD Pyxis
                             9 September 2019

===========================================================================

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

Product:           Becton, Dickinson and Company Pyxis
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2019-13517  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsma-19-248-01

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

ICS Medical Advisory (ICSMA-19-248-01)

BD Pyxis

Original release date: September 05, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.6
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Becton, Dickinson and Company (BD)
  o Equipment: Pyxis
  o Vulnerability: Session Fixation

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow the Active Directory
(AD) credentials of a previously authenticated user to gain access to the
device. This could result in an attacker having the same level of privilege
previously granted to a user prior to account expiration, and could allow
access to patient data and medications. For exploitation to occur, products
must be actively using AD for login and be connected to the hospital domain.
Users who do not use AD are not impacted by this vulnerability.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of BD Pyxis, a medication management platform, are
affected:

  o Pyxis ES Versions 1.3.4 through to 1.6.1
  o Pyxis Enterprise Server, with Windows Server Versions 4.4 through 4.12

3.2 VULNERABILITY OVERVIEW

3.2.1 SESSION FIXATION CWE-384

A vulnerability has been identified where existing access privileges are not
restricted in coordination with the expiration of access based on active
directory user account changes when the device is joined to an AD domain.

CVE-2019-13517 has been assigned to this vulnerability. A CVSS v3 base score of
7.6 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:L ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

BD reported this vulnerability to CISA.

4. MITIGATIONS

BD notes that connecting medication dispensing cabinets to a hospital domain is
an uncommon configuration and is not recommended by BD. BD also notes this
vulnerability has been remediated in the latest release of Version 1.6.1.1, and
recommends the following mitigations and compensating controls in order to
reduce risk associated with this vulnerability:

  o Remove expired users from the relevant AD role that grants access to the
    Pyxis ES system.
  o Pyxis ES systems are not recommended to be placed on the hospital domain.
  o As a best practice, users should not rely on expiration dates to remove
    users from their hospitals' AD system.

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all medical devices and/or systems.
  o Locate medical devices behind firewalls and isolate them where possible.
  o Restrict system access to authorized personnel only and follow a least
    privilege approach.
  o Apply defense-in-depth strategies.
  o Disable any unnecessary accounts, protocols and services.
  o Where additional information is needed, refer to existing cybersecurity in
    medical device guidance issued by the FDA at the following location: https:
    //www.fda.gov/medical-devices/digital-health/cybersecurity

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

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov 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 CISA for tracking
and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves
from social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target this vulnerability.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=qjZs
-----END PGP SIGNATURE-----