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AUSCERT External Security Bulletin Redistribution
ESB-2019.1716.2
Advisory (ICSA-19-134-*) Siemens Products
11 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Products
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Overwrite Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-10924 CVE-2019-10922 CVE-2019-10921
CVE-2019-10920 CVE-2019-10919 CVE-2019-10918
CVE-2019-10917 CVE-2019-10916 CVE-2019-6578
CVE-2019-6577 CVE-2019-6576 CVE-2019-6574
CVE-2019-6572 CVE-2018-16417 CVE-2018-7084
CVE-2018-7083 CVE-2018-7082 CVE-2018-7064
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-02-0
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-03
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-04
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-05
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-06
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-07
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-08
https://ics-cert.us-cert.gov/advisories/ICSA-19-134-09
Comment: This bulletin contains eight (8) ICS-CERT security advisories.
Revision History: October 11 2019: Update to Update D
May 15 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-19-134-08)
Siemens SIMATIC PCS7, WinCC, TIA Portal (Update D)
Original release date: October 10, 2019
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/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.1
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: SIMATIC PCS7, WinCC Runtime Professional, WinCC (TIA Portal)
o Vulnerabilities: SQL Injection, Uncaught Exception, Exposed Dangerous
Method
2. UPDATE INFORMATION
This updated advisory is a follow-up to the advisory update titled
ICSA-19-134-08 Siemens SIMATIC PCS7, WinCC, TIA Portal (Update C) that was
published September 10, 2019, on the ICS webpage on us-cert.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute arbitrary commands on the affected system.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following Siemens SIMATIC products are affected:
- --------- Begin Update D Part 1 of 2 --------
o SIMATIC WinCC (TIA Portal v14): all versions prior to v14 SP1 Upd 9
o SIMATIC WinCC (TIA Portal v15): all versions prior to v15.1 Upd 3
o SIMATIC WinCC Runtime Professional v14: all versions prior to v14.1 Upd 8
o SIMATIC WinCC Runtime Professional v15: all versions prior to v15.1 Upd 3
- --------- End Update D Part 1 of 2 ---------
o SIMATIC PCS7 v8.0 and earlier: all versions
o SIMATIC PCS7 v8.1: all versions prior to v8.1 with WinCC v7.3 Upd 19
o SIMATIC PCS7 v8.2: all versions prior to v8.2 SP1 with WinCC v7.4 SP1 Upd
11
o SIMATIC PCS7 v9.0: all versions prior to v9.0 SP2 with WinCC v7.4 SP1 Upd
11
o SIMATIC WinCC (TIA Portal) v13: all versions
o SIMATIC WinCC Runtime Professional v13: all versions
o SIMATIC WinCC v7.2 and earlier: all versions
o SIMATIC WinCC v7.3: all versions prior to v7.3 Upd 19
o SIMATIC WinCC v7.4: all versions prior to v7.4 with WinCC v7.4 SP1 Upd 11
o SIMATIC WinCC v7.5: all versions prior to v7.5 Upd 3
4.2 VULNERABILITY OVERVIEW
4.2.1 SQL INJECTION CWE-89
An attacker with network access to the project file could run arbitrary system
commands with the privileges of the local database server. This may impact the
confidentiality, integrity, and availability of the affected system.
CVE-2019-10916 has been assigned to this vulnerability. A CVSS v3 base score of
9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/
C:H/I:H/A:H ).
4.2.2 UNCAUGHT EXCEPTION CWE-248
An attacker with local access to the project file could cause a
denial-of-service condition on the affected product as the project file is
loaded. Successful exploitation could compromise availability of the affected
system.
CVE-2019-10917 has been assigned to this vulnerability. A CVSS v3 base score of
3.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:N/I:N/A:L ).
4.2.3 EXPOSED DANGEROUS METHOD OR FUNCTION CWE-749
An authenticated attacker with network access to the DCOM interface could
execute arbitrary commands with SYSTEM privileges. Successful exploitation
could compromise confidentiality, integrity, and availability of the affected
system.
CVE-2019-10918 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
4.3 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
4.4 RESEARCHER
Vladimir Dashchenko and Sergey Temnikov from Kaspersky Lab, CNCERT/CC, and
ChengBin Wang from Guoli Security Technology reported these vulnerabilities to
Siemens.
5. MITIGATIONS
Siemens has an update available for the following affected products:
- --------- Begin Update D Part 2 of 2 --------
o SIMATIC WinCC (TIA Portal v14): Update to v14 SP1 Upd 9
o SIMATIC WinCC (TIA Portal v15): Update to v15.1 Upd 3
o SIMATIC WinCC Runtime Professional v14: Update to v14.1 Upd 8
o SIMATIC WinCC Runtime Professional v15: Update to v15.1 Upd 3
- ---------- End Update D Part 2 of 2 ---------
o SIMATIC PCS7 v8.1: Update WinCC to v7.3 Upd 19
o SIMATIC PCS7 v8.2: Update WinCC to v7.4 SP1 Upd 11
o SIMATIC PCS7 v9.0: Update WinCC to v7.4 SP1 Upd 11
o SIMATIC WinCC v7.3: Update WinCC to v7.3 Upd 19
o SIMATIC WinCC v7.4: Update WinCC to v7.4 SP1 Upd 11
o SIMATIC WinCC v7.5: Update WinCC to v7.5 Upd 3
Siemens recommends users apply the following specific workarounds and
mitigations to reduce risk until updates or patches are available:
o Apply defense-in-depth strategies.
o Enable "Encrypted communication" in SIMATIC WinCC and SIMATIC PCS7.
o Only open project files from trusted locations.
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends users configure their
environment according to the Siemens operational guidelines for 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 on these vulnerabilities and more detailed mitigation
instructions, please see Siemens security advisory SSA-697412 at the following
location:
http://www.siemens.com/cert/advisories
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 these vulnerabilities.
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