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AUSCERT External Security Bulletin Redistribution
ESB-2015.1424
IDS RTU 850 Directory Traversal Vulnerability
1 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IDS RTU 850
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-3939
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-148-01
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Advisory (ICSA-15-148-01)
IDS RTU 850 Directory Traversal Vulnerability
Original release date: May 28, 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
Independent researchers Benjamin Kahler and Sebastian Kraemer of HSASec have
identified a directory traversal vulnerability in IDS RTU 850C. IDS has
produced a new module that mitigates this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following IDS communications modules in the IDS 850 family are affected:
NC854, and
NC856.
IMPACT
An attacker could use this vulnerability to access credentials that could be
used to 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 this vulnerability based on their operational environment,
architecture, and product implementation.
BACKGROUND
IDS is a German-based company that maintains offices in six countries around
the world, including Switzerland, Morocco, Iran, United Arab Emirates, Czech
Republic, and Romania.
The affected products are deployed in several sectors including
Communications, Energy, and Water and Wastewater Systems.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
DIRECTORY TRAVERSAL [a]
Using this vulnerability, an attacker is able to access some files from the
internal service interface of the communication module. One of the accessible
files contains the credentials (passwords) to access the internal service
interface via telnet.
CVE-2015-3939 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 8.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:S/C:N/I:C/A:C). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with high skill would be able to exploit this vulnerability.
MITIGATION
The communication modules can be protected against the described vulnerability
by disabling the internal web server. This can be made via configuration
settings.
The communication modules NC854 and NC856 were discontinued in 2009 and
replaced by newer communication modules. Because both communication modules
are past end of life, no update or patch will be produced.
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, 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 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-22: Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal'), http://cwe.mitre.org/data/definitions/22.html, web site
last accessed May 28, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-3939,
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://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:S/C:N/I:C/A:C, web
site last accessed May 28, 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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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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which may arise from following or acting on information or advice contained in
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NOTE: This is only the original release of the security bulletin. It may
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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