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AUSCERT External Security Bulletin Redistribution
ESB-2014.0243
Siemens RuggedCom Uncontrolled Resource Consumption Vulnerability
25 February 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens RuggedCom family
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-1966
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-14-051-03
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Advisory (ICSA-14-051-03)
Siemens RuggedCom Uncontrolled Resource Consumption Vulnerability
Original release date: February 20, 2014
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
Researchers Ling Toh Koh, Ng Yi Teng, Seyed Dawood Sajjadi Torshizi, Ryan Lee,
and Ho Ping Hou of EV-Dynamic, Malaysia, have identified an uncontrolled
resource consumption vulnerability in the Siemens RuggedCom ROS-based devices.
Siemens has produced a firmware update that mitigates this vulnerability in ROS
v3.12. Siemens continues to develop firmware updates that mitigate the
vulnerability in ROS v3.11 and prior, or ROS v4.0.
The vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following RuggedCom ROS-based devices are affected:
- - All ROS versions prior to 3.11,
- - ROS 3.11 (for RS950G): all versions,
- - ROS 3.12: all versions prior to ROS v3.12.4, and
- - ROS 4.0 (for RSG2488).
IMPACT
Successful exploitation of this vulnerability may result in attackers causing a
denial of service (DoS).
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 products, RuggedCom ROS-based products, are switches and
serial-to-Ethernet devices. According to Siemens, RuggedCom ROS-based products
are operated in harsh environments such as electric utility substations and
traffic control cabinets. Siemens estimates that these products are used
primarily in the United States and Europe with a small percentage in Asia.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
UNCONTROLLED RESOURCE CONSUMPTION [a]
The implementation of the Simple Network Management Protocol (SNMP) protocol in
the affected devices might allow attackers to perform a DoS attack by sending
specially crafted packets over the network without authentication. Switching
functionality is lost by a successful attack and all management services of the
devices will be unresponsive. After a manual cold restart of the device, full
operation will be restored.
CVE-2014-1966 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 5.4 has been assigned; the CVSS vector string is
(AV:N/AC:H/Au:N/C:N/I:N/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 a high skill would be able to exploit this vulnerability.
MITIGATION
RuggedCom/Siemens has provided firmware update ROS v3.12.4 that mitigates the
potential vulnerability for RuggedCom products running ROS v3.12.
Firmware updates that fix the potential vulnerability for RuggedCom products
running ROS v3.11 and prior, or ROS v4.0 are in preparation. The advisory will
be updated when the new releases are available.
The firmware update can be obtained for free by contacting the RuggedCom
support team at support@ruggedcom.com.
Siemens security advisory is located here:
Siemens security advisory SSA-892342
NCCIC/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 VPN is only as secure as the connected
devices.
NCCIC/ICS-CERT also provides a section for control systems security recommended
practices on the NCCIC/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. NCCIC/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 NCCIC/ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B—Targeted
Cyber Intrusion Mitigation Strategies, that is available for download from the
NCCIC/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 NCCIC/ICS-CERT for
tracking and correlation against other incidents.
[a]. CWE-400: Uncontrolled Resource Consumption, http://cwe.mitre.org/data/definitions/400.html,
web site last accessed February 20, 2014.
[b]. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-1966, 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:N/AC:H/Au:N/C:N/I:N/A:C,
web site last accessed February 20, 2014.
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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