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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-257-01) LOYTEC LVIS-3ME
15 September 2017
AusCERT Security Bulletin Summary
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Existing Account
Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2017-13998 CVE-2017-13996 CVE-2017-13994
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Original release date: September 14, 2017
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CVSS v3 8.1
ATTENTION: Remotely exploitable/low skill level to exploit.
Vulnerabilities: Relative Path Traversal, Insufficient Entropy, Cross-site
Scripting, Insufficiently Protected Credentials
The following versions of LVIS-3ME, an HMI Touch Panel, are affected:
LVIS-3ME versions prior to 6.2.0
Successful exploitation of these vulnerabilities may result in information
exposure or allow arbitrary code execution.
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
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
INSUFFICIENT ENTROPY CWE-331
The application does not utilize sufficiently random number generation for the
web interface authentication mechanism, which could allow remote code
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
IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
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
INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
The application does not sufficiently protect sensitive information from
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
Davy Douhine of RandoriSec reported the vulnerabilities to ICS-CERT.
Critical Infrastructure Sectors: Critical Manufacturing, Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Austria
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