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AUSCERT External Security Bulletin Redistribution
ESB-2016.0779
Siemens APOGEE Insight Incorrect File Permissions Vulnerability
24 March 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens APOGEE Insight
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Modify Arbitrary Files -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2016-3155
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-082-01
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Advisory (ICSA-16-082-01)
Siemens APOGEE Insight Incorrect File Permissions Vulnerability
Original release date: March 22, 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 identified an incorrect file permissions vulnerability in APOGEE
Insight. Network & Information Security Ltd. Company and HuNan Quality
Inspection Institute reported this issue directly to Siemens. Siemens has
provided workaround instructions to mitigate this vulnerability.
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following product:
APOGEE Insight: All versions.
IMPACT
This vulnerability could allow authenticated users of the operating system to
modify application data for the affected product.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/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.
The affected product, APOGEE Insight software, provides a graphical interface
to manage and control buildings. According to Siemens, APOGEE Insight software
is deployed across several sectors including Commercial Facilities. Siemens
estimates that this product is used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
INCORRECT DEFAULT PERMISSIONS[a]
The file permissions set for the APOGEE Insight application folder could allow
authenticated operating system users to modify the APOGEE Insight application
data if local access was obtained.
CVE-2016-3155[b] has been assigned to this vulnerability. A CVSS v3 base score
of 3.4 has been calculated; the CVSS vector string is
(CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N).[c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely, and an attacker would need to
be an authenticated user of the operating system.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
Siemens is working on a new APOGEE Insight version to resolve the
vulnerability, and ICS-CERT will update this advisory as soon as new
information becomes available.
Siemens has detailed instructions on how to mitigate the vulnerability by
correcting file permissions. To receive these instructions, users should
contact their local service organization or a local Siemens hotline center:
http://www.automation.siemens.com/mcms/aspadb/en/automationtechnology/Pages/default.aspx
(link is external)
For more information on this vulnerability and more detailed mitigation
instructions, see Siemens Security Advisory SSA-151221 at the following
location:
http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external)
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
Limit access of authenticated users to only the machines that are needed.
Compartmentalize your network.
Restrict which programs a user can run.
Lock unattended machines.
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 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.
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-276: Incorrect Default Permissions,
http://cwe.mitre.org/data/definitions/276.html, web site last accessed March
22, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3155, web
site last accessed March 22, 2016.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S...,
web site last accessed March 22, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov (link sends e-mail)
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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