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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0405
Advisory (ICSA-15-048-02) Siemens SIMATIC WinCC TIA Portal Vulnerabilities
                             19 February 2015

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

Product:           Siemens SIMATIC WinCC TIA Portal
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
                   Unauthorised Access      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-1358 CVE-2014-4686 

Reference:         ESB-2014.1246.2

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-15-048-02

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Advisory (ICSA-15-048-02)
Siemens SIMATIC WinCC TIA Portal Vulnerabilities
Original release date: February 17, 2015

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

Gleb Gritsai, Roman Ilin, Aleksandr Tlyapov, and Sergey Gordeychik from 
Positive Technologies have identified authentication vulnerabilities in the 
Siemens SIMATIC WinCC TIA Portal application. Siemens has produced a service 
pack that mitigates these vulnerabilities.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

The following Siemens products are affected:

- - SIMATIC WinCC TIA Portal: All versions prior to V13 SP1

IMPACT

An attacker exploiting these vulnerabilities could possibly reconstruct used 
passwords or escalate privileges.

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 product, SIMATIC WinCC TIA Portal, is engineering software for 
SIMATIC products. This software is deployed across several sectors including 
Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. 
Siemens estimates that these products are used primarily in the United States
and Europe with a small percentage in Asia.

VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
INSUFFICIENTLY PROTECTED CREDENTIALS[a]

The remote management module of WinCC TIA Portal Multi Panels and Comfort 
Panels, and WinCC RT Advanced transmits weakly protected credentials over the
network. Attackers capturing network traffic of the remote management module 
could possibly reconstruct used passwords.

CVE-2015-1358[b] has been assigned to this vulnerability. A CVSS v2 base score 
of 4.3 has been assigned; the CVSS vector string is 
(AV:N/AC:M/Au:N/C:P/I:N/A:N).[c]

HARD-CODED CRYPTOGRAPHIC KEY[d]

A hard-coded encryption key used in WinCC RT Professional could allow 
attackers to escalate their privileges if the applications network 
communication with an authenticated user was captured.

CVE-2014-4686[e] has been assigned to this vulnerability. A CVSS v2 base score 
of 6.8 has been assigned; the CVSS vector string is 
(AV:N/AC:M/Au:N/C:P/I:P/A:P).[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 a low skill would be able to exploit these vulnerabilities.

MITIGATION

Siemens provides Service Pack 1 for SIMATIC WinCC TIA Portal V13 which 
mitigates the vulnerabilities.

http://support.automation.siemens.com/WW/view/en/106567433

For more information on these vulnerabilities and detailed instructions, 
please see Siemens Security Advisory SSA-543623 at the following location:

http://www.siemens.com/cert/advisories

ICS-CERT encourages asset owners to take additional defensive measures to 
protect against this and other cybersecurity risks.

- - 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 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. 
ICS-CERT reminds organizations to perform proper impact analysis and risk 
assessment prior to deploying defensive measures.

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-522: Insufficiently Protected Credentials, 
http://cwe.mitre.org/data/definitions/522.html, web site last accessed 
February 17, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1358, 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, 
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:N/A:N, web
site last accessed February 17, 2015.
d. CWE-321: Use of Hard-coded Cryptographic Key, 
http://cwe.mitre.org/data/definitions/321.html, web site last accessed 
February 17, 2015.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-4686, web 
site last accessed February 17, 2015.
f. CVSS Calculator, 
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web
site last accessed February 17, 2015.

Contact Information

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

Email: ics-cert@hq.dhs.gov
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.

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