CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS
Percentile
60.8%
This updated advisory is a follow-up to the updated advisory titled ICSA-14-051-03A Siemens RuggedCom Uncontrolled Resource Consumption Vulnerability that was published March 18, 2014, on the NCCIC/ICS-CERT web site.
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.
The vulnerability could be exploited remotely.
The following RuggedCom ROS-based devices are affected:
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. 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) in the affected devices might allow attackers to perform a DoS attack against the device’s IP management interface by sending specially crafted packets over the network without authentication. Switching functionality is not affected and special and uncommon conditions must be fulfilled to perform this attack. After a manual cold restart of the device, access to the IP management interface is restored.
CVE-2014-1966NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-1966, web site last accessed March 18, 2014. has been assigned to this vulnerability. A CVSS v2 base score of 2.6 has been assigned; the CVSS vector string is (AV:N/AC:H/Au:N/C:N/I:N/A:P).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:H/Au:N/C:N/I:N/A:P, web site last accessed March 18, 2014.
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.
Siemens/RuggedCom provides firmware updates ROS v3.11.5, ROS v3.12.4, and ROS v4.1.0 that fix the vulnerability for RS950G products running ROS v3.11, products running ROS v3.12 and prior, and RSG2488 products running ROS v4.0.
The firmware updates for the RuggedCom ROS-based devices can be obtained for free from the following contact points:
<http://www.siemens.com/automation/support-request>
or
<http://www.automation.siemens.com/mcms/aspa-db/en/automation-technology/Pages/default.aspx>
Siemens security advisory is located here:
Siemens security advisory SSA-892342
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
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.
www.automation.siemens.com/mcms/aspa-db/en/automation-technology/Pages/default.aspx
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