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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3445
   Advisory (icsa-19-253-04) Siemens IE-WSN-PA Link WirelessHART Gateway
                             11 September 2019

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

Product:           Siemens IE-WSN-PA Link WirelessHART Gateway
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Mitigation
CVE Names:         CVE-2019-13923  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-19-253-04

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ICS Advisory (ICSA-19-253-04)

Siemens IE-WSN-PA Link WirelessHART Gateway

Original release date: September 10, 2019

Legal Notice

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1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o ATTENTION: Exploitable remotely
  o Vendor: Siemens
  o Equipment: IE/WSN-PA Link WirelessHART Gateway
  o Vulnerability: Cross-site Scripting

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow information
disclosure, code execution, or denial-of-service.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

All versions of IE/WSN-PA Link WirelessHART Gateway are affected.

3.2 VULNERABILITY OVERVIEW

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

An attacker sending a malicious link to an unsuspecting user may be able to
execute a cross-site scripting attack, which may allow information disclosure,
code execution, or denial-of-service.

CVE-2019-13923 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:H/PR:N/UI:R/S:U/
C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
    Food and Agriculture, Water and Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has identified the following specific workarounds and mitigations that
users can apply to reduce the risk:

  o Only access links from trusted sources in the browser used to configure IE/
    WSN-PA Link.

As a general security measure, Siemens strongly recommends users protect
network access to devices with appropriate mechanisms. In order to operate the
devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens' operational guidelines for industrial
security (download: https://www.siemens.com/cert/
operational-guidelines-industrial-security ), and follow the recommendations in
the product manuals. Additional information on industrial security by Siemens
can be found at: https://www.siemens.com/industrialsecurity

For more information, please see Siemens Security Advisory SSA-191683 at the
following location:
http://www.siemens.com/cert/advisories

CISA recommends users take the following measures to protect themselves from
social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

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

No known public exploits specifically target this vulnerability. High skill
level is needed to exploit.

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