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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2414
Siemens SIMATIC STEP 7 (TIA Portal) Information Disclosure Vulnerabilities
                              14 October 2016

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

Product:           SIMATIC STEP 7 (TIA Portal)
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7960 CVE-2016-7959 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-287-03

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Advisory (ICSA-16-287-03)

Siemens SIMATIC STEP 7 (TIA Portal) Information Disclosure Vulnerabilities

Original release date: October 13, 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 released a new version of SIMATIC STEP 7 (TIA Portal) to
mitigate information disclosure vulnerabilities. These vulnerabilities
were reported directly to Siemens by Dmitry Sklyarov and Gleb Gritsai
from Positive Technologies. Siemens has produced a new version to mitigate
these vulnerabilities.

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following versions of
SIMATIC STEP 7 (TIA Portal):

    SIMATIC STEP 7 (TIA Portal): All versions prior to V14

IMPACT

A local attacker who exploits these vulnerabilities may be able to access
sensitive information contained in TIA Portal project files under certain
conditions.

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. According to Siemens, SIMATIC Step 7 (TIA Portal)
is deployed across several sectors including Chemical, Energy, Food and
Agriculture, and Water and Wastewater Systems. Siemens estimates that this
product is used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

INADEQUATE ENCRYPTION STRENGTH[a]

Local attackers with read access to TIA Portal project files could
brute-force preshared keys used for machine-to-machine communication with
possibly reduced effort.

CVE-2016-7959[b] has been assigned to this vulnerability. A CVSS
v3 base score of 2.5 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).[c]

CRYPTOGRAPHIC ISSUES[d]

Local attackers could circumvent the protection of the transport format
of TIA Portal project files and potentially access sensitive configuration
settings. This format is used by TIA Portal during the migration of project
files to a new version (e.g., V12 to V13).

CVE-2016-7960[e] has been assigned to this vulnerability. A CVSS
v3 base score of 2.5 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).[f]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities are not exploitable remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

Crafting a working exploit for these vulnerabilities would be difficult.

MITIGATION

Access to the TIA Portal project files on engineering workstations
or network storage must be protected with appropriate mechanisms from
unauthorized access.

Siemens provides SIMATIC STEP 7 (TIA Portal) V14, which fixes the
vulnerabilities and recommends users migrate projects to the new version. It
can be found at the following location on the Siemens web site:

https://support.industry.siemens.com/cs/ww/en/view/109740340

Siemens strongly recommends users protect network access to engineering
workstations and project storage with appropriate mechanisms. 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

For more information on these vulnerabilities and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-869766 at the
following location:

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

ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Generally, 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.

    a.
    CWE-326: Inadequate Encryption Strength,
    https://cwe.mitre.org/data/definitions/326.html, web site last accessed
    October 13, 2016.
    b.
    NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7959,
    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:L/AC:H/PR:L/UI:N/S...,
    web site last accessed October 13, 2016.
    d.
    CWE-310: Cryptographic Issues,
    https://cwe.mitre.org/data/definitions/310.html, web site last accessed
    October 13, 2016.
    e.
    NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7960,
    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:L/AC:H/PR:L/UI:N/S...,
    web site last accessed October 13, 2016.


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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