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ESB-2016.0438 - [Appliance] AMX Products: Unauthorised access - Remote/unauthenticated

Date: 22 February 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0438
        AMX Multiple Products Credential Management Vulnerabilities
                             22 February 2016

===========================================================================

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

Product:           AMX Products
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1984 CVE-2015-8362 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-049-02

- --------------------------BEGIN INCLUDED TEXT--------------------

Advisory (ICSA-16-049-02 )

AMX Multiple Products Credential Management Vulnerabilities

Original release date: February 18, 2016

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

NCCIC/ICS-CERT has become aware of public reporting of credential management
vulnerabilities in multiple Harman AMX multimedia devices. AMX has confirmed
the existence of hard-coded passwords in multiple products. AMX has produced
patches and new product versions to mitigate one of the vulnerabilities
in the affected products. AMX is working to release new product versions
to mitigate the remaining credential management vulnerability in their
affected products.

These vulnerabilities could be exploited remotely. Exploits that target
these vulnerabilities are known to be publicly available.

AFFECTED PRODUCTS

The following AMX multimedia devices are affected by vulnerability
CVE-2015-8362:

    NX-1200, NX-2200, NX-3200, NX-4200 NetLinx Controller, versions prior
    to Version 1.4.65,
    Massio ControlPads MCP-10x, versions prior to Version 1.4.65,
    Enova DVX-x2xx, versions prior to Version 1.4.65,
    DVX-31xxHD-SP (-T), versions prior Version 4.8.331,
    DVX-21xxHD-SP (-T), versions prior Version 4.8.331,
    DVX-2100HD-SP-T Master, versions prior to Version 4.1.420 (Hotfix
    firmware version),
    Enova DGX 100 NX Series Master, versions prior to Version 1.4.72
    (Hotfix firmware version),
    Enova DGX 8/16/32/64 NX Series Master, versions prior to Version 1.4.72
    (Hotfix firmware version),
    Enova DGX 8/16/32/64 NI Series Master, versions prior to Version 4.2.397
    (Hotfix firmware version),
    NI-700, NI-900 Master Controllers (64M RAM), versions prior to Version
    4.1.419,
    NI-700, NI-900 Master Controllers (32M RAM), versions prior to Version
    3.60.456 (Hotfix firmware version),
    NI-2100, NI-3100, NI-4100, NI-2100 with ICSNet, NI-3100 with ICSNet,
    NI-3100/256,
    NI-3100/256 with ICSNet, NI-4100/256, versions prior to Version 4.1.419,
    NI-3101-SIG Master Controller, versions prior to Version 4.1.419,
    NI-2000, NI-3000, NI-4000, versions prior to Version 3.60.456 (Hotfix
    firmware version), and
    ME260/64 Duet, versions prior to Version 3.60.456 (Hotfix firmware
    version).

The following AMX multimedia devices are affected by vulnerability
CVE-2016-1984:

    NX-1200, NX-2200, NX-3200, NX-4200 NetLinx Controller, Version 1.4.65
    and Version 1.4.66 (Hotfix firmware version),
    Massio ControlPads MCP-10x, Version 1.4.65 and Version 1.4.66 (Hotfix
    firmware version),
    Enova DVX-x2xx, Version 1.4.65 and Version 1.4.72 (Hotfix firmware
    version),
    Enova DGX 100 NX Series Master, Version 1.4.72 (Hotfix firmware
    version), and
    Enova DGX 8/16/32/64 NX Series Master, Version 1.4.72 (Hotfix firmware
    version).

IMPACT

Successful exploitation of these vulnerabilities may allow an attacker
to remotely gain access to the affected systems with elevated privileges
to configure user interfaces, change device settings, upload files, and
download files.

Impact to individual organizations depends on many factors that are unique
to each organization. ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.

BACKGROUND

AMX is part of the Harman Professional Division, which provides audio and
video solutions for IT environments. AMX is a US-based company that is
headquartered in Dallas, Texas.

The affected products are used for audio and video automation in conference
rooms and classrooms. According to AMX, these products are deployed across
the Commercial Facilities and Government Facilities sectors. AMX estimates
that these products are used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

CREDENTIALS MANAGEMENT[a]

Affected devices contain a hard-coded password for a diagnostic account
with elevated privileges that can be used to configure user settings,
device settings, upload files, and download files.

CVE-2015-8362[b] has been assigned to this vulnerability. A CVSS v3
base score of 9.9 has been assigned by AMX; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H).[c]

CREDENTIALS MANAGEMENT[d]

Affected devices contain a hard-coded password for an account that has
privileges to exchange Internet Control System Protocol (ICSP) messages,
which are accessed via Port 1319/TCP and UDP. AMX reports that this
hard-coded password affects firmware Version 1.4.x.

CVE-2016-1984[e] has been assigned to this vulnerability. A CVSS v3
base score of 5.8 has been assigned by AMX; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N).[f]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

Exploits that target these vulnerabilities are known to be publicly
available.

DIFFICULTY

An attacker with a low skill would be able to exploit these vulnerabilities.

MITIGATION

AMX has reported the release of standard firmware versions and Hotfix
firmware versions, which mitigates vulnerability, CVE-2015-8362, in the
affected products. AMX's standard firmware releases for affected products
are available for download at the following URL, with a valid account:

http://www.amx.com/techcenter/.

AMXService@harman.com.

AMX has indicated that older devices may require interim firmware updates
if the currently installed firmware is older than the versions listed in
the dependencies columns. For more information read the Product Release
Notes or contact AMX Tech Support.

The credential management vulnerability, CVE-2016-1984, affects firmware,
Version 1.4.65 through Version 1.4.72. AMX is planning to address this
vulnerability in a later version, which is scheduled for release in April
2016. AMX recommends that users consider applying the following interim
mitigations until product updates are available:

Most NX series devices have a secondary port (ICSLAN) intended for the
connection of AMX client devices. ICSP must remain enabled on any network,
which the Central Controller connects to AMX Client devices in order for
the system to operate as a functional control system. AMX recommends that
users consider applying the following interim mitigations:

    If no ICSP devices are connected to the NX series devices, via the LAN
    (external) interface, disable ICSP control protocol on the external
    interface from the basic administrative interface.
    Isolate vulnerable systems from the Internet and untrusted systems.

ICS-CERT 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.

ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

ICS-CERT also provides a section for control systems
security recommended practices on the ICS-CERT web page at:
http://ics-cert.us-cert.gov/content/recommended-practices. 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 in the ICS-CERT 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
(http://ics-cert.us-cert.gov/).

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.

    a.
    CWE-255: Credentials Management,
    http://cwe.mitre.org/data/definitions/255.html, web site last accessed
    February 18, 2016.
    b.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-8362,
    This web site was last accessed February 18, 2016.
    c.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
    web site last accessed February 18, 2016.
    d.
    CWE-255: Credentials Management,
    http://cwe.mitre.org/data/definitions/255.html, web site last accessed
    February 18, 2016.
    e.
    NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-1984,
    This web site was last accessed February 18, 2016.
    f.
    CVSS Calculator,
    https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
    web site last accessed February 18, 2016.


Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

ICS-CERT 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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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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