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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3444
                Advisory (icsa-19-253-02) Siemens SINETPLAN
                             11 September 2019

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

Product:           Siemens SINETPLAN
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Access Confidential Data        -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10915  

Reference:         ESB-2019.2587

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-19-253-02

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ICS Advisory (ICSA-19-253-02)

Siemens SINETPLAN

Original release date: September 10, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
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For more information about TLP, see http://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 8.0
  o ATTENTION: Low skill level to exploit
  o Vendor: Siemens
  o Equipment: Siemens Network Planner (SINETPLAN)
  o Vulnerability: Improper Authorization

2. RISK EVALUATION

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

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of SINETPLAN, an automation systems planner, are
affected:

  o SINETPLAN Version 2.0

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER AUTHORIZATION CWE-285

The integrated configuration web application allows the execution of certain
application commands without proper authentication.

CVE-2019-10915 has been assigned to this vulnerability. A CVSS v3 base score of
8.0 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
C:L/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 recommends users update TIA Administrator to Version 1.0 SP1 Upd1.
Updates can be found at the following link:

https://support.industry.siemens.com/cs/ww/en/view/114358

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

  o Restrict access to Port 8888/TCP to localhost

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-834884 at the
following location:
http://www.siemens.com/cert/advisories

CISA recommends 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.

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. This
vulnerability is not exploitable remotely.

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