ESB-2018.1040 - [Appliance] Moxa MXview: Access privileged data - Remote/unauthenticated 2018-04-06

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1040
                   Advisory (ICSA-18-095-02) Moxa MXview
                               6 April 2018

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

Product:           Moxa MXview
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7506  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-095-02

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Advisory (ICSA-18-095-02) Moxa MXview

Original release date: April 05, 2018

Legal Notice

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"as is" for informational purposes only. The Department of Homeland Security 
(DHS) does not provide any warranties of any kind regarding any information 
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more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

    CVSS v3 7.5
    ATTENTION: Exploitable remotely/low skill level to exploit.
    Vendor: Moxa
    Equipment: MXview
    Vulnerabilities: Information Exposure

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote attacker to
access and read cryptographic private keys.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of MXview, network management software, are affected:

    MXview versions 2.8 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1 INFORMATION EXPOSURE CWE-200

The private key of the web server is able to be read and accessed via an HTTP
GET request, which may allow a remote attacker to decrypt encrypted 
information.

CVE-2018-7506 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:H/I:N/A:N).

3.3 BACKGROUND

    Critical Infrastructure Sectors: Critical Manufacturing, Energy, 
Transportation Systems

    Countries/Areas Deployed: Worldwide
    Company Headquarters Location: Taiwan

3.4 RESEARCHER

Michael DePlante of Leahy Center for Digital Investigation at Champlain 
College reported this vulnerability to NCCIC.

4. MITIGATIONS

Moxa has developed a new version of MXview to mitigate the vulnerability. 
MXview versions 2.9 can be downloaded from the Moxa Support Website (link is 
external).

NCCIC recommends that 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.

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