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AUSCERT External Security Bulletin Redistribution
ESB-2015.1146
Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION Scout, and
STARTER Insufficiently Qualified Paths (Update A)
27 April 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: SIMATIC ProSave
SIMATIC Scout
SIMATIC STARTER
SIMATIC CFC
SIMATIC STEP
SIMATIC PCS
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1594
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-064-02A
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Advisory (ICSA-15-064-02A)
Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION Scout, and
STARTER Insufficiently Qualified Paths (Update A)
Original release date: April 23, 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
This updated advisory is a follow-up to the original advisory titled
ICSA-15-064-02 Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION
Scout, and STARTER Insufficiently Qualified Paths that was published March 5,
2015, on the NCCIC/ICS-CERT web site.
Ivan Sanchez from WiseSecurity Team has identified a search path vulnerability
in the Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION Scout,
and STARTER applications. Siemens has produced updates for each of these
products that mitigates this vulnerability.
AFFECTED PRODUCTS
The following Siemens products are affected:
SIMATIC ProSave: all versions prior to V13 SP1
SIMOTION Scout: all versions prior to V4.4
STARTER: all versions prior to V4.4 HF3
SIMATIC CFC
All versions prior to V8.0 SP4
CFC V8.0 SP4: all versions prior to V8.0 SP4 Upd 9
CFC V8.1: all versions prior to V8.1 Upd1
- --------- Begin Update A Part 1 of 1 --------
SIMATIC STEP 7 V5.5
All versions prior to V5.5 SP1
STEP 7 V5.5 SP1: all versions prior to V5.5 SP1 HF2
STEP 7 V5.5 SP2: all versions prior to V5.5 SP2 HF7
STEP 7 V5.5 SP3: all versions prior to V5.5 SP3 HF10
STEP 7 V5.5 SP4: all versions prior to V5.5 SP4 HF4
SIMATIC PCS 7 (as STEP 7 and CFC are incorporated)
All versions prior to V8.0 SP2
PCS 7 V8.0 SP2: all versions prior to V8.0 SP2 with STEP 7 V5.5 SP3 HF10 and
CFC V8.0 SP4 Upd9
PCS 7 V8.1: all versions prior to V8.1 with STEP 7 SP4 HF4 and CFC V8.1 Upd1.
- --------- End Update A Part 1 of 1 ----------
IMPACT
This vulnerability could allow attackers to execute arbitrary code from files
located on the local file system or connected network shares with the
privileges of the user running the affected products.
Impact to individual organizations depends on many factors that are unique to
each organization. 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.
SIMATIC ProSave is used for backup restore and firmware update for SIMATIC HMI
panels. SIMOTION SCOUT is a framework for motion control engineering system
tools. STARTER is a drive engineering tool for parameterizing and
commissioning. SIMATIC CFC (Continuous Function Chart) is a graphic editor
that is a core component of PCS 7 engineering. STEP 7 is Siemens engineering
software for PLC and hardware configuration. SIMATIC PCS 7 is a distributed
control system (DCS) integrating SIMATIC STEP 7 and SIMATIC CFC. According to
Siemens, 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
UNTRUSTED SEARCH PATH[a]
Insufficiently qualified paths could allow attackers to execute arbitrary code
from files located on the local file system or connected network shares with
the privileges of the user running the affected products. For successful
exploitation an unsuspecting user must be tricked into opening a manipulated
application file.
CVE-2015-1594[b] has been assigned to this vulnerability. A CVSS v2 base score
of 6.9 has been assigned; the CVSS vector string is
(AV:L/AC:M/Au:N/C:C/I:C/A:C).[c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely and cannot be exploited without
user interaction. The exploit is only triggered when a local user runs the
vulnerable application and loads the malformed file.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
Crafting a working exploit for this vulnerability would require a moderate
amount of skill. 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 updates for the following products and recommends customers
to update to the new fixed versions:
The update for SIMATIC ProSave can be obtained here:
https://support.industry.siemens.com/cs/de/en/view/10347815
The update for SIMOTION SCOUT can be obtained here:
https://support.industry.siemens.com/cs/de/en/view/107586911
The update for STARTER can be obtained here:
https://support.industry.siemens.com/cs/ww/en/view/26233208
Updates for SIMATIC STEP 7 and SIMATIC CFC can obtained via customer support
at:
http://www.siemens.com/automation/support-request
For more information on these vulnerabilities and detailed instructions,
please see Siemens Security Advisory SSA-451236 at the following location:
http://www.siemens.com/cert/advisories
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[d] for more information on
avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks[e] for more
information on social engineering attacks.
In addition, 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 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
(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-426: Untrusted Search Path,
http://cwe.mitre.org/data/definitions/426.html, web site last accessed March
05, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1594, web
site last accessed April 23, 2015.
c. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:M/Au:N/C:C/I:C/A:C, web
site last accessed March 05, 2015.
d. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed March 05, 2015.
e. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed March
05, 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
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Australian Computer Emergency Response Team
The University of Queensland
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Qld 4072
Internet Email: auscert@auscert.org.au
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