ESB-2018.0371 - [Win] Vyaire Medical CareFusion Upgrade Utility: Increased privileges - Existing account 2018-02-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0371
                        Advisory (ICSMA-18-037-01)
                              7 February 2018

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

Product:           Vyaire Medical CareFusion Upgrade Utility
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5457  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-037-01

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Vyaire Medical CareFusion Upgrade Utility Vulnerability


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/.


OVERVIEW

Independent researcher Mark Cross (@xerubus) has identified an uncontrolled
search path element vulnerability in Vyaire Medical's CareFusion Upgrade Utility
application. Vyaire Medical has produced an update that mitigates this
vulnerability.


AFFECTED PRODUCTS

The following versions of CareFusion Upgrade Utility, designed to upgrade
compatible units to the latest software versions, are affected:

    CareFusion Upgrade Utility used with Windows XP systems, Versions 2.0.2.2
    and prior versions.


IMPACT

Successful exploitation of this vulnerability may allow an attacker to insert a
malicious DLL on the target system and run arbitrary code.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC recommends that organizations evaluate the impact of
this vulnerability based on their operational environment and specific clinical
usage.


BACKGROUND

Vyaire Medical is a U.S.-based company.

The affected product, CareFusion Upgrade Utility, is designed to upgrade
compatible units to the latest software versions. According to Vyaire Medical,
CareFusion Upgrade Utility is deployed across the Healthcare and Public Health
sector. Vyaire Medical estimates these products are used primarily in the United
States and Europe, with a small percentage in Asia.


VULNERABILITY

CHARACTERIZATION VULNERABILITY OVERVIEW UNCONTROLLED SEARCH PATH ELEMENT CWE-427

A successful exploit of this vulnerability requires the local user to install a
crafted DLL on the target machine. The application loads the DLL and gives the
attacker access at the same privilege level as the application.

CVE-2018-5457 has been assigned to this vulnerability. A CVSS v3 base score of
6.7 has been assigned; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H).


VULNERABILITY DETAILS EXPLOITABILITY

This vulnerability is not remotely exploitable.


EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.


DIFFICULTY

High skill level is needed to exploit.


MITIGATION

Vyaire Medical is no longer supporting the CareFusion Upgrade Utility v2.0.2.2
and recommends that users upgrade to the newer Vyaire Upgrade Utility v2.0.3.0.
This updated Upgrade Utility will not install on Windows XP and will require
updating the underlying system to Windows 7 or later.

Vyaire Medical has released a Product Security Bulletin, available at the
following URL:

https://www.vyaire.com/productsecurity

The Vyaire Upgrade Utility v2.0.3.0 update is available at the following URL:

https://www.vyaire.com/us/our-products/respiratory-care/pulmonary-function-testing/spirometers/spirometry-software-and-firmware-downloads

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

    Do not upload and run untrusted files without verifying the integrity of the
    file.  Interact with, and only obtain files, software, and software patches
    from trustworthy highly reputable sources.  Ensure that employees with
    access to the CareFusion Upgrade Utility are fully aware of the ongoing
    potential for social engineering attacks and are trained to identify and
    avoid social engineering attacks.  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. NCCIC reminds organizations to perform proper impact
analysis and risk assessment prior to deploying defensive measures.

Additional mitigation guidance and recommended practices are publicly available
in the NCCIC 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.

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.

Previous Recommendations can be used as needed (otherwise, delete this text).
List other products that are specific to the topic (i.e., phishing mitigations):

In addition, NCCIC recommends that users take the following measures to protect
themselves from social engineering attacks:

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


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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