ESB-2018.1416 - [Appliance] Silex & GE Healthcare MobileLink: Multiple vulnerabilities 2018-05-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1416
       Silex Technology SX-500/SD-320AN or GE Healthcare MobileLink
                                9 May 2018

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

Product:           Silex Technology SX-500
                   Silex Technology SD-320AN
                   GE Healthcare MobileLink
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Unauthorised Access             -- Remote/Unauthenticated
                   Execute Arbitrary Code/Commands -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6021 CVE-2018-6020 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-128-01

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Silex Technology SX-500/SD-320AN or GE Healthcare MobileLink

Original release date: May 08, 2018

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

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1. EXECUTIVE SUMMARY

  * CVSS v3 7.4
  * ATTENTION: Exploitable Remotely / Low skill level to exploit / Public
    exploits are available
  * Vendors: Silex Technology, GE Healthcare
  * Equipment: SX-500, SD-320AN, MobileLink
  * Vulnerabilities: Improper Authentication, OS Command Injection

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow modification of
system settings and remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products from Silex Technology are affected. Some are not
affected by both vulnerabilities (see Mitigations Section):

  * GEH-500 Version 1.54 and prior(integrated into GE MobileLink),
  * SX-500 All Versions (End of Life 2011),
  * GEH-SD-320AN Version GEH-1.1 and prior (integrated into GE MobileLink), and
  * SD-320AN Version 2.01 and prior (End of Life Nov 2017).

The following models of GE MAC Resting ECG analysis system may use the
vulnerable MobileLink technology:

  * MAC 3500,
  * MAC 5000 (End of Life 2012),
  * MAC 5500, and
  * MAC 5500 HD.

3.2 VULNERABILITY OVERVIEW

3.2.1   IMPROPER AUTHENTICATION CWE-287

Authentication is not verified when making certain POST requests, which may
allow attackers to modify system settings.

CVE-2018-6020 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N
/I:L/A:L).

3.2.2  IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78

A system call parameter is not properly sanitized, which may allow remote code
execution.

CVE-2018-6021 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:L
/I:L/A:L).

3.3 BACKGROUND

  * Critical Infrastructure Sectors: Healthcare and Public Health
  * Countries/Areas Deployed: Worldwide
  * Company Headquarters Location: United States

3.4 RESEARCHER

Eric Evenchick of Atredis Partners reported these vulnerabilities to Silex and
GE and tested pre-release firmware and other mitigations confirming they
resolved the vulnerabilities.

4. MITIGATIONS

Silex Technologies and GE Healthcare recommend the following mitigations:

CVE-2018-6020 (GE MobileLink/SX-500) ? Enable the ?update? account within the
web interface, which is not enabled by default. Set the secondary password for
the ?update? account to prevent unauthenticated changes to the device
configuration.

CVE-2018-6021 (GE MobileLink/GEH-SD-320AN) ? Silex Technology and GE Healthcare
have produced an updated firmware image for the GEH-SD-320AN, which will be
made available for download from GE Healthcare upon completion of testing by
May 31, 2018.

GE Healthcare will post information pertaining to enabling the ?update? account
and download of new firmware at:

http://www3.gehealthcare.com/en/support/security

The firmware update for SD-320AN is separate from GEH-SD-320AN and will be
available for download from Silex Technology at a future date. Note that this
update does not pertain to the listed GEH device. Contact Silex Technology for
more information regarding download and application of this new firmware.

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

  * 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. 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.


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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