ESB-2018.1771 - [Appliance] Natus Xltek NeuroWorks: Multiple vulnerabilities 2018-06-15

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1771
             Advisory (ICSMA-18-165-01) Natus Xltek NeuroWorks
                               15 June 2018

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

Product:           Natus Xltek NeuroWorks
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-2869 CVE-2017-2868 CVE-2017-2867
                   CVE-2017-2861 CVE-2017-2860 CVE-2017-2858
                   CVE-2017-2853 CVE-2017-2852 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSMA-18-165-01

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Advisory (ICSMA-18-165-01)
Natus Xltek NeuroWorks
Original release date: June 14, 2018

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
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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 10.0
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Natus Medical, Inc. (Natus)
  o Equipment: Natus Xltek NeuroWorks software
  o Vulnerabilities: Stack-Based Buffer Overflow, Out-of-Bounds Read

2. RISK EVALUATION

Successful exploitation of these vulnerabilities require access to the Natus
customer network, and could crash the device being accessed; a buffer overflow
condition may allow remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following version of Natus Xltek NeuroWorks, used in Natus Xltek EEG
medical products, are affected:

  o Natus Xltek NeuroWorks Version 8

3.2 VULNERABILITY OVERVIEW

3.2.1    OUT-OF-BOUNDS READ CWE-125

A specially-crafted packet may be able to cause an out-of-bounds read, which
may result in a denial-of-service condition.

CVE-2017-2852 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.2    STACK-BASED BUFFER OVERFLOW CWE-121

An attacker may cause a buffer overflow by sending a specially-crafted packet
to the affected product while the product attempts to open a file requested by
the client.

CVE-2017-2853 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

3.2.3    OUT-OF-BOUNDS READ CWE-125

A specially-crafted packet may cause an out-of-bounds read, which may result in
a denial-of-service condition.

CVE-2017-2858 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.4    OUT-OF-BOUNDS READ CWE-125

A specially-crafted packet may cause an out-of-bounds read, which may result in
a denial-of-service condition.

CVE-2017-2860 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.5    OUT-OF-BOUNDS READ CWE-125

A specially-crafted packet may cause an out-of-bounds read, which may result in
a denial-of-service condition.

CVE-2017-2861 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.6    STACK-BASED BUFFER OVERFLOW CWE-121

A specially-crafted packet received during the execution of certain commands
can cause memory to be overwritten in a way that could allow an attacker to
take control of the program.

CVE-2017-2867 has been assigned to this vulnerability. A CVSS v3 base score of
9.0 has been calculated; the CVSS vector string is
(AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H).

3.2.7    STACK-BASED BUFFER OVERFLOW CWE-121

An error in the way the program parses data structures may allow an attacker to
take control of the system by sending it a specially-crafted packet.

CVE-2017-2868 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

3.2.8    STACK-BASED BUFFER OVERFLOW CWE-121

A specially-crafted packet takes advantage of the way the program parses data
structures and may cause a buffer overflow, which may allow remote execution of
arbitrary code.

CVE-2017-2869 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Pleasanton, California

3.4 RESEARCHER

Cory Duplantis from Cisco Talos discovered these vulnerabilities and reported
them to Natus.

4. MITIGATIONS

Natus has released NeuroWorks/SleepWorks 8.5 GMA 3, a software update with
security enhancements to address the vulnerabilities identified in NeuroWorks/
SleepWorks 8.

A free software update to NeuroWorks/SleepWorks 8.5 GMA 3 is available to users
using NeuroWorks/SleepWorks Version 8.0, 8.1, 8.4, or 8.5. Contact the Natus
Neuro Technical support department at 1-800 387-7516 or email
Oakville_Technical_Service@natus.com for more details.

Natus recommends installing this update as quickly as possible on affected
systems.

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 these vulnerabilities.


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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