Operating System:

[Win]

Published:

19 February 2015

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0400
       Advisory (ICSA-15-048-01)  Siemens SIMATIC STEP 7 TIA Portal
                              Vulnerabilities
                             19 February 2015

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

Product:           Siemens SIMATIC STEP 7 TIA Portal
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-1356 CVE-2015-1355 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-15-048-01

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Advisory (ICSA-15-048-01) 
Siemens SIMATIC STEP 7 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

Aleksandr Timorin from Positive Technologies has identified authentication 
vulnerabilities in the Siemens SIMATIC STEP 7 TIA Portal application. Siemens
has produced a service pack that mitigates these vulnerabilities. 

AFFECTED PRODUCTS

The following Siemens products are affected:

- - SIMATIC STEP 7 TIA Portal: All versions prior to V13 SP1

IMPACT

A local user who is tricked into exploiting these vulnerabilities could 
possibly escalate privileges for an attacker. 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 STEP 7 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
WEAK PASSWORD HASHING[a]

Device user passwords in TIA Portal project files are stored using a weak 
hashing algorithm. Attackers with read access to the project file could 
possibly reconstruct the passwords for device users.

CVE-2015-1355[b] has been assigned to this vulnerability. A CVSS v2 base score 
of 2.1 has been assigned; the CVSS vector string is 
(AV:L/AC:L/Au:N/C:P/I:N/A:N).[c] 

PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS[d]

Privilege information for device users is stored unprotected in the TIA Portal
project file. Attackers with access to the project file could possibly read 
and modify the permissions for device users in the project file. If 
unsuspecting users are tricked to download the manipulated project file to the
device, the user permissions become active.

CVE-2015-1356[e] has been assigned to this vulnerability. A CVSS v2 base score 
of 2.6 has been assigned; the CVSS vector string is 
(AV:L/AC:H/Au:N/C:P/I:P/A:N).[f] 

VULNERABILITY DETAILS
EXPLOITABILITY

These vulnerabilities are not exploitable remotely without local user 
interaction. 

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities. 

DIFFICULTY

Crafting a working exploit for these vulnerabilities would be difficult. 
Social engineering is required to convince the user to accept the malformed 
file. Additional user interaction is needed to load the malformed file. This 
decreases the likelihood of a successful exploit. 

MITIGATION

Siemens provides Service Pack 1 for STEP 7 TIA Portal V13, which mitigates the
vulnerabilities.

http://support.automation.siemens.com/WW/view/en/105825934

For more information on these vulnerabilities and detailed instructions, 
please see Siemens Security Advisory SSA-234789 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.

In addition, ICS-CERT recommends that users take the following measures to 
protect themselves from social engineering attacks:

- - Do not click web links or open unsolicited attachments in email messages.
- - Refer to Recognizing and Avoiding Email Scams[g] for more information on 
avoiding email scams. 
- - Refer to Avoiding Social Engineering and Phishing Attacks[h] for more 
information on social engineering attacks.

a. CWE-916: Use of Password Hash With Insufficient Computational Effort, 
http://cwe.mitre.org/data/definitions/916.html, web site last accessed 
February 17, 2015. 
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1355, 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:L/AC:L/Au:N/C:P/I:N/A:N, web 
site last accessed February 17, 2015. 
d. CWE-264: Permissions, Privileges, and Access Controls, 
http://cwe.mitre.org/data/definitions/264.html, web site last accessed 
February 17, 2015. 
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1356, 
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, 
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:H/Au:N/C:P/I:P/A:N, 
web site last accessed February 17, 2015. 
g. Recognizing and Avoiding Email Scams, 
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last 
accessed February 17, 2015. 
h. National Cyber Alert System Cyber Security Tip ST04-014, 
http://www.us-cert.gov/cas/tips/ST04-014.html, 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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