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             AUSCERT External Security Bulletin Redistribution

     Siemens RuggedCom Uncontrolled Resource Consumption Vulnerability
                             25 February 2014


        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: 

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Advisory (ICSA-14-051-03)

Siemens RuggedCom Uncontrolled Resource Consumption Vulnerability

Original release date: February 20, 2014

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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.


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).


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.


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.


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]


This vulnerability could be exploited remotely.

No known public exploits specifically target this vulnerability.

An attacker with a high skill would be able to exploit this vulnerability.


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 

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 

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: 

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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