ESB-2018.0208 - ALERT [Win] Siemens SIMATIC WinCC: Multiple vulnerabilities 2018-01-19

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0208
         Multiple vulnerabilities have been identified in Siemens
                           SIMATIC WinCC Add-On
                              19 January 2018

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

Product:           Siemens SIMATIC WinCC
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-11498 CVE-2017-11497 CVE-2017-11496

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-018-01

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Advisory (ICSA-18-018-01)

Siemens SIMATIC WinCC Add-On

Original release date: January 18, 2018

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/.

CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Siemens

Equipment: SIMATIC WinCC Add-On

Vulnerabilities: Stack-Based Buffer Overflow, Input Validation.

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following versions of 
SIMATIC WinCC Add-On:

SIMATIC WinCC Add-On Historian CONNECT ALARM all versions prior to and 
including v5.x,

SIMATIC WinCC Add-On PI CONNECT ALARM all versions prior to and including 
v2.x,

SIMATIC WinCC Add-On PI CONNECT AUDIT TRAIL all versions prior to and 
including v1.x,

SIMATIC WinCC Add-On PM-AGENT all versions prior to and including v5.x,

SIMATIC WinCC Add-On PM-ANALYZE all versions prior to and including v7.x,

SIMATIC WinCC Add-On PM-CONTROL all versions prior to and including v10.x,

SIMATIC WinCC Add-On PM-MAINT all versions prior to and including v9.x,

SIMATIC WinCC Add-On PM-OPEN EXPORT all versions prior to and including v7.x,

SIMATIC WinCC Add-On PM-OPEN HOST-S all versions prior to and including v7.x,

SIMATIC WinCC Add-On PM-OPEN IMPORT all versions prior to and including v6.x,

SIMATIC WinCC Add-On PM-OPEN PI all versions prior to and including v7.x,

SIMATIC WinCC Add-On PM-OPEN PV02 all versions prior to and including v1.x,

SIMATIC WinCC Add-On PM-OPEN TCP/IP all versions prior to and including v8.x,

SIMATIC WinCC Add-On PM-QUALITY all versions prior to and including v9.x,

SIMATIC WinCC Add-On SICEMENT IT MIS all versions prior to and including v7.x,
and

SIMATIC WinCC Add-On SIPAPER IT MIS all versions prior to and including v7.x

IMPACT

Successful exploitation of these vulnerabilities could allow remote code 
execution or a denial of service condition.

MITIGATION

Gemalto has released an updated installer and Siemens strongly encourages 
users upgrade to the new installer as soon as possible. The new installer is 
available at:

https://supportportal.gemalto.com/csm/?id=kb_article&sys_id=a459d328dba207c8fe0aff3dbf9619ce
(link is external)

Siemens also advises that users configure the operational environment 
according to Siemens Operational Guidelines for Industrial Security:

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

For more information on these vulnerabilities and more detailed mitigation 
instructions, please see Siemens Security Advisory SSA-127490 at the following
location:

http://www.siemens.com/cert/advisories (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 ICS-CERT 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.

No known public exploits specifically target these vulnerabilities.

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

Malformed ASN1 streams in V2C and similar input files can be used to generate
stack-based buffer overflows. The vulnerability could allow arbitrary code 
execution.

CVE-2017-11496 has been assigned to this vulnerability. A CVSS v3 base score 
of 9.8 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

STACK-BASED BUFFER OVERFLOW CWE-121

Language packs containing malformed filenames could lead to a stack-based 
buffer overflow. The vulnerability could allow arbitrary code execution.

CVE-2017-11497 has been assigned to this vulnerability. A CVSS v3 base score 
of 9.8 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

IMPROPER INPUT VALIDATION CWE-20

Language pack (ZIP file) with invalid HTML files could lead to NULL pointer 
access. The vulnerability could cause denial of service of the remote process.

CVE-2017-11498 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.5 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

RESEARCHER

Sergey Temnikov and Vladimir Dashchenko from Kaspersky Lab reported these 
vulnerabilities to Siemens.

BACKGROUND

Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Water
and Wastewater Systems.

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact the NCCIC at:

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

Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information: 
http://ics-cert.us-cert.gov

or incident reporting: https://ics-cert.us-cert.gov/Report-Incident?

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

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