ESB-2018.3011 - [Appliance] Change Healthcare PeerVue Web Server: Access confidential data - Remote/unauthenticated 2018-10-05

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3011
     Advisory (ICSMA-18-277-02) - Change Healthcare PeerVue Web Server
                              5 October 2018

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

Product:           Change Healthcare PeerVue Web Server
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10624  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-277-02

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Advisory (ICSMA-18-277-02)

Change Healthcare PeerVue Web Server

Original release date: October 04, 2018

Legal Notice

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For more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

  o CVSS v3 4.3
  o ATTENTION: Exploitable on an adjacent network/low skill level to exploit
  o Vendor: Change Healthcare
  o Equipment: PeerVue Web Server
  o Vulnerability: Information Exposure Through an Error Message

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to obtain
technical information about the PeerVue Web Server, allowing an attacker to
target a system for attack.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Change Healthcare reports the vulnerability affects the following product:

  o PeerVue Web Server all versions up to 7.6.2

3.2 VULNERABILITY OVERVIEW

3.2.1    INFORMATION EXPOSURE THROUGH AN ERROR MESSAGE CWE-209

This vulnerability results from improper error handling in HTTP-based
communications with the server, which could allow an attacker to obtain
technical information.

CVE-2018-10624 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:L
/I:N/A:N).

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

Dan Regalado of Zingbox reported this vulnerability to NCCIC.

4. MITIGATIONS

    Change Healthcare has been very responsive and aggressive in their efforts
to mitigate the issue and released a patch to remediate the reported
vulnerability. Users should contact the Change Healthcare Support team for
information regarding the patch.

NCCIC 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,
    and ensure that they are not accessible from the Internet.
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o 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 this vulnerability, but
information regarding this vulnerability has been publicly disclosed.

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?

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