ESB-2018.0307 - [Appliance] Phoenix Contact mGuard: Root compromise - Remote with user interaction 2018-01-31

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0307
             Advisory (ICSA-18-030-01) PHOENIX CONTACT mGuard
                              31 January 2018

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

Product:           Phoenix Contact mGuard
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5441  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-030-01

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CVSS v3 7.8

ATTENTION: Low skill level to exploit.

Vendor: PHOENIX CONTACT

Equipment: mGuard

Vulnerability: Improper Validation of Integrity Check Value


AFFECTED PRODUCTS

The following versions of mGuard, a network device, are affected:

    mGuard firmware versions 7.2 to 8.6.0


IMPACT

Successful exploitation of this vulnerability could allow for an attacker to
modify firmware update packages.


MITIGATION

PHOENIX CONTACT recommends that affected users upgrade to firmware version 8.6.1

    MGUARD CENTERPORT
	http://www.phoenixcontact.net/qr/2702547/firmware_update

    MGUARD DELTA TX/TX
	http://www.phoenixcontact.net/qr/2700967/firmware_update

    MGUARD DELTA TX/TX VPN
	http://www.phoenixcontact.net/qr/2700968/firmware_update

    MGUARD GT/GT
	http://www.phoenixcontact.net/qr/2700197/firmware_update

    MGUARD GT/GT VPN
	http://www.phoenixcontact.net/qr/2700198/firmware_update

    MGUARD PCI4000 VPN
	http://www.phoenixcontact.net/qr/2701275/firmware_update

    MGUARD PCIE4000 VPN
	http://www.phoenixcontact.net/qr/2701278/firmware_update

    MGUARD RS2000 TX/TX VPN
	http://www.phoenixcontact.net/qr/2700642/firmware_update

    MGUARD RS2000 TX/TX-B
	http://www.phoenixcontact.net/qr/2702139/firmware_update

    MGUARD RS2005 TX VPN
	http://www.phoenixcontact.net/qr/2701875/firmware_update

    MGUARD RS4000 TX/TX
	http://www.phoenixcontact.net/qr/2700634/firmware_update

    MGUARD RS4000 TX/TX VPN
	http://www.phoenixcontact.net/qr/2200515/firmware_update

    MGUARD RS4000 TX/TX VPN-M
	http://www.phoenixcontact.net/qr/2702465/firmware_update

    MGUARD RS4000 TX/TX-P
	http://www.phoenixcontact.net/qr/2702259/firmware_update

    MGUARD RS4004 TX/DTX
	http://www.phoenixcontact.net/qr/2701876/firmware_update

    MGUARD RS4004 TX/DTX VPN
	http://www.phoenixcontact.net/qr/2701877/firmware_update

    MGUARD SMART2
	http://www.phoenixcontact.net/qr/2700640/firmware_update

    MGUARD SMART2 VPN
	http://www.phoenixcontact.net/qr/2700639/firmware_update

    MGUARD RS2000 3G VPN
	http://www.phoenixcontact.net/qr/2903441/firmware_update

    MGUARD RS4000 3G VPN
	http://www.phoenixcontact.net/qr/2903440/firmware_update

    MGUARD CORE TX VPN
	http://www.phoenixcontact.net/qr/2700640/firmware_update

    MGUARD RS2000 4G VPN
	http://www.phoenixcontact.net/qr/2903588/firmware_update

    MGUARD RS4000 4G VPN
	http://www.phoenixcontact.net/qr/2903586/firmware_update


NCCIC recommends 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
in the NCCIC 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.

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. This
vulnerability is not remotely exploitable.


VULNERABILITY OVERVIEW

IMPROPER VALIDATION OF INTEGRITY CHECK VALUE CWE-354

mGuard devices rely on internal checksums for verification of the internal
integrity of the update packages. Verification may not always be performed
correctly, allowing an attacker to modify firmware update packages.

CVE-2018-5441 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is
(AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).


RESEARCHER

PHOENIX CONTACT reported to CERT@VDE that their products are affected. CERT@VDE
coordinated this vulnerability with NCCIC.


BACKGROUND

Critical Infrastructure Sectors: Communications, Critical Manufacturing,
Information Technology

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

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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