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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1822
 Multiple vulnerabilities have been identified in Siemens SIMATIC products
                               27 July 2016

===========================================================================

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

Product:           Siemens SIMATIC NET PC-Software
                   Siemens SIMATIC WinCC products
                   Siemens SIMATIC PCS 7
Publisher:         ICS-CERT
Operating System:  Network Appliance
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5874 CVE-2016-5744 CVE-2016-5743

Original Bulletin: 
   http://ics-cert.us-cert.gov/advisories/ICSA-16-208-01
   http://ics-cert.us-cert.gov/advisories/ICSA-16-208-02

Comment: This bulletin contains two (2) ICS-CERT security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

Advisory (ICSA-16-208-01)

Siemens SIMATIC WinCC, PCS 7, and WinCC Runtime Professional Vulnerabilities

Original release date: July 26, 2016

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/.

OVERVIEW

Siemens has identified two vulnerabilities in SIMATIC WinCC, PCS 7, and WinCC
Runtime Professional. Sergey Temnikov and Vladimir Dashchenko from Kaspersky 
Lab reported these issues directly to Siemens. Siemens has produced updates to
mitigate these vulnerabilities.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following products:

    SIMATIC WinCC:
        V7.0 SP 2 and earlier versions,
        V7.0 SP 3: All versions,
        V7.2: All versions,
        V7.3: All versions prior to 7.3 Update 10, and
        V7.4: All versions prior to 7.4 Update 1

    SIMATIC PCS 7 (WinCC, Batch, Route Control, OPEN PCS 7):
        V7.1 SP4 and earlier versions,
        V8.0: All versions,
        V8.1: All versions, and
        V8.2: All versions

    SIMATIC WinCC Runtime Professional: All versions prior to V13 SP 1 Update 9

IMPACT

Attackers exploiting these vulnerabilities could possibly extract arbitrary 
files or remotely execute arbitrary code.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the 
impact of these vulnerabilities based on their operational environment, 
architecture, and product implementation.

BACKGROUND

Siemens is a multinational company headquartered in Munich, Germany.

The affected products are: SIMATIC WinCC, a supervisory control and data 
acquisition (SCADA) system; and PCS7, a distributed control system (DCS) 
integrating SIMATIC WinCC. These products are deployed across several sectors
including Chemical, Energy, Food and Agriculture, and Water and Wastewater 
Systems. Siemens estimates that these products are used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

IMPROPER INPUT VALIDATION [a]

Specially crafted packets sent to SIMATIC WinCC or WinCC Runtime Professional
could allow remote code execution for unauthenticated users.

CVE-2016-5743 [b] has been assigned to this vulnerability. A CVSS v3 base score 
of 9.8 has been calculated; the CVSS vector string is 
(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). [c]

IMPROPER INPUT VALIDATION [d]

Specially crafted packets sent to SIMATIC WinCC could allow unauthenticated 
users to extract arbitrary files from the WinCC station. This vulnerability 
only affects WinCC V7.0 and WinCC V7.2.

CVE-2016-5744 [e] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.5 has been calculated; the CVSS vector string is 
(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). [f]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

An attacker with low skill would be able to exploit these vulnerabilities.

MITIGATION

Siemens has produced updates for the following products and strongly 
encourages users to upgrade to the new versions as soon as possible:

WinCC V7.3: Update to WinCC V7.3 Update 10

https://support.industry.siemens.com/cs/ww/en/view/109738470 (link is 
external)

WinCC V7.4: Update to WinCC V7.4 Update 1

https://support.industry.siemens.com/cs/ww/de/view/109738653 (link is 
external)

PCS 7 V8.1 SP1:

WinCC: Update to WinCC V7.3 Update 10

https://support.industry.siemens.com/cs/ww/en/view/109738470 (link is 
external)

SIMATIC BATCH: Update to SIMATIC BATCH V8.1 SP1 Upd. 9

Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link
is external)

OpenPCS 7: Update to OpenPCS 7 V8.1 Upd. 3

Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link
is external)

PCS 7 V8.2:

WinCC: Update to WinCC V7.4 Update 1 (link is external)

https://support.industry.siemens.com/cs/ww/de/view/109738653 (link is 
external)

OpenPCS 7: Update to OpenPCS7 V8.2 Update 1

Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link
is external)

WinCC Runtime Professional V13: Update to WinCC Runtime Professional V13 SP1 
Update 9: https://support.industry.siemens.com/cs/ww/en/view/109311724 (link 
is external)

Until updates can be applied, Siemens recommends the following steps to 
mitigate the risk:

Always run WinCC, WinCC Runtime Professional, and PCS 7 stations within a 
trusted network.

Ensure that WinCC, WinCC Runtime Professional, and PCS 7 stations communicate
via encrypted channels only (e.g., activate feature Encrypted Communications 
in WinCC V7.3 and PCS 7 V8.1 SP1, or establish a VPN tunnel).

Restrict access to the WinCC, WinCC Runtime Professional and PCS 7 stations to
trusted entities.

Apply up-to-date application whitelisting software and virus scanners.

For more information on these vulnerabilities and more detailed mitigation 
instructions, please see Siemens Security Advisory SSA-378531 at the following
location:

http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external)

As a general security measure Siemens strongly recommends protecting network 
access to the WinCC and PCS 7 stations with appropriate mechanisms. Siemens 
advises configuring the environment according to Siemens operational 
guidelines in order to run the devices in a protected IT environment.

https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external)

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 at: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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 
(http://ics-cert.us-cert.gov/).

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.

a. CWE-20: Improper Input Validation, 
http://cwe.mitre.org/data/definitions/20.html, web site last accessed July 26,
2016.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5743, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

c. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed July 26, 2016.

d. CWE-20: Improper Input Validation, 
http://cwe.mitre.org/data/definitions/20.html, web site last accessed July 26,
2016.

e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5744, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

f. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed July 26, 2016.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

- ---

Advisory (ICSA-16-208-02)

Siemens SIMATIC NET PC-Software Denial-of-Service Vulnerability

Original release date: July 26, 2016

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/.

OVERVIEW

Siemens has identified a denial-of-service vulnerability in SIMATIC NET 
PC-Software. Vladimir Dashchenko and Sergey Temnikov from Kaspersky Labs 
reported this issue directly to Siemens. Siemens has produced a new version to
mitigate this vulnerability.

This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

Siemens reports that the vulnerability affects the following SIMATIC products:

    SIMATIC NET PC-Software: All versions prior to V13 SP2

IMPACT

A successful exploit of this vulnerability could cause a denial-of-service 
condition that would require a manual restart to recover.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the 
impact of this vulnerability based on their operational environment, 
architecture, and product implementation.

BACKGROUND

Siemens is a multinational company headquartered in Munich, Germany.

The affected product, the Siemens SIMATIC NET PC-Software, is designed for 
communication between controllers (PLCs) and PC-based solutions (HMIs). 
According to Siemens, the SIMATIC NET PC-Software is deployed across several 
sectors including Chemical, Critical Manufacturing, and Food and Agriculture.
Siemens estimates that this product is used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

RESOURCE EXHAUSTION [a]

Specially crafted packets sent to several ports (Port 55101/TCP through Port 
55105/TCP, Port 4845/TCP, and Port 4847/TCP through Port 4850/TCP) could cause
a denial-of-service of the OPC-Unified Architecture (UA) service. A manual 
restart of the service is required to recover the system.

CVE-2016-5874 [b] has been assigned to this vulnerability. A CVSS v3 base score 
of 5.3 has been calculated; the CVSS vector string is 
(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L[A1] ). [c]

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

An attacker with a low skill would be able to exploit this vulnerability.

MITIGATION

Siemens provides SIMATIC NET PC-Software V13 SP2, which fixes the 
vulnerability, and recommends users upgrade to the new version. SIMATIC NET 
PC-Software V13 SP2 can be obtained by contacting your local Siemens 
representative or customer support.

If OPC-UA is not required, Siemens recommends deactivating these in the 
communication settings according to the information in the respective product
manual.

As a general security measure, Siemens strongly recommends protecting network
access to SIMATIC NET PC-Software services with appropriate mechanisms. It is
advised to configure the environment according to Siemens operational 
guidelines in order to run the devices in a protected IT environment.

https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external)

For more information on this vulnerability and detailed instructions, please 
see Siemens Security Advisory SSA-453276 at the following location:

http://www.siemens.com/cert/advisories (link is external)

ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

Monitor traffic to Port 55101/TCP through Port 55105/TCP, Port 4845/TCP, and 
Port 4847/TCP through Port 4850/TCP on the affected devices. Restrict access 
if not needed.

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 at: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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 
(http://ics-cert.us-cert.gov/).

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.

a. CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion'), 
http://cwe.mitre.org/data/definitions/400.html, web site last accessed July 
26, 2016.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5874, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

c. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed July 26, 2016.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

- --------------------------END INCLUDED TEXT--------------------

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