ESB-2017.2339 - [Appliance] LVIS-3ME: Multiple vulnerabilities 2017-09-15

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2339
                 Advisory (ICSA-17-257-01) LOYTEC LVIS-3ME
                             15 September 2017

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

Product:           LVIS-3ME
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Access Privileged Data          -- Existing Account            
                   Cross-site Scripting            -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-13998 CVE-2017-13996 CVE-2017-13994
                   CVE-2017-13992  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-257-01

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Advisory (ICSA-17-257-01)

LOYTEC LVIS-3ME

Original release date: September 14, 2017

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/.

CVSS v3 8.1

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: LOYTEC

Equipment: LVIS-3ME

Vulnerabilities: Relative Path Traversal, Insufficient Entropy, Cross-site 
Scripting, Insufficiently Protected Credentials

AFFECTED PRODUCTS

The following versions of LVIS-3ME, an HMI Touch Panel, are affected:

LVIS-3ME versions prior to 6.2.0

IMPACT

Successful exploitation of these vulnerabilities may result in information 
exposure or allow arbitrary code execution.

MITIGATION

LOYTEC has released a firmware update, V6.2.0, to address these 
vulnerabilities. LOYTEC recommends that users update to the latest firmware 
update which is available by accessing an account at the following location:

https://www.loytec.com/support/download/ (link is external)

NCCIC/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. 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 ICSCERT 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 ICS-CERT for 
tracking and correlation against other incidents.

In addition, ICS-CERT recommends that users take the following measures to 
protect themselves from social engineering attacks:

1.Do not click web links or open unsolicited attachments in email messages.

2.Refer to Recognizing and Avoiding Email Scamsfor more information on 
avoiding email scams.

3.Refer to Avoiding Social Engineering and Phishing Attacksfor more 
information on social engineering attacks.

No known public exploits specifically target these vulnerabilities. These 
vulnerabilities are remotely exploitable. Low skill level is needed to 
exploit.

VULNERABILITY OVERVIEW

RELATIVE PATH TRAVERSAL CWE-23

The web user interface fails to prevent access to critical files that non 
administrative users should not have access to, which could allow an attacker
to create or modify files or execute arbitrary code.

CVE-2017-13996 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.6 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L).

INSUFFICIENT ENTROPY CWE-331

The application does not utilize sufficiently random number generation for the
web interface authentication mechanism, which could allow remote code 
execution.

CVE-2017-13992 has been assigned to this vulnerability. A CVSS v3 base score 
of 8.1 has been assigned; the CVSS vector string is 
(AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE 
SCRIPTING') CWE-79

The web interface lacks proper web request validation, which could allow XSS 
attacks to occur if an authenticated user of the web interface is tricked into
clicking a malicious link.

CVE-2017-13994 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.6 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L).

INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522

The application does not sufficiently protect sensitive information from 
unauthorized access.

CVE-2017-13998 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.5 has been assigned; the CVSS vector string is 
(AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

RESEARCHER

Davy Douhine of RandoriSec reported the vulnerabilities to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Austria

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