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AUSCERT External Security Bulletin Redistribution
Advisory (icsma-19-241-01) Change Healthcare McKesson and
30 August 2019
AusCERT Security Bulletin Summary
Product: Horizon Cardiology
Change Healthcare Cardiology
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2018-18630
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ICS Medical Advisory (ICSMA-19-241-01)
Change Healthcare McKesson and Horizon Cardiology
Original release date: August 29, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Change Healthcare
o Equipment: Change Healthcare Cardiology, Horizon Cardiology, McKesson
o Vulnerability: Incorrect Default Permissions
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a locally
authenticated user to insert specially crafted files that could result in
arbitrary code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Change Healthcare Cardiology Devices, are affected:
o Horizon Cardiology 11.x and earlier
o Horizon Cardiology 12.x
o McKesson Cardiology 13.x
o McKesson Cardiology 14. x
o Change Healthcare Cardiology 14.1.x
3.2 VULNERABILITY OVERVIEW
3.2.1 INCORRECT DEFAULT PERMISSIONS CWE-276
Insecure file permissions in the default installation may allow an attacker
with local system access to execute unauthorized arbitrary code.
CVE-2018-18630 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Alfonso Powers and Bradley Shubin of Asante Information Security reported this
vulnerability to Change Healthcare.
Change Healthcare recommends users of the affected versions contact Change
Healthcare Support as soon as possible to arrange installation of the supplied
patch; To contact Change Healthcare Support please call:
o U.S./Canada 1-877-654-4366
o International Toll Free - 972-37698000 ext. 1
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system 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
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:
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
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 that 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. This
vulnerability is not exploitable remotely.
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