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Advisory (ICSA-14-107-01)

Siemens SINEMA Vulnerabilities

Original release date: April 17, 2014 | Last revised: April 18, 2014

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OVERVIEW

Siemens has identified vulnerabilities in SINEMA server. Siemens has produced a software update that mitigates these vulnerabilities.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

The following Siemens product is affected:

  • SINEMA server: all versions prior to V12 SP1

IMPACT

Successfull exploitation of these vulnerabilities may result in attackers performing remote code execution, traversing through the file system, or causing a denial of service.

Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.

BACKGROUND

Siemens is a multinational company headquartered in Munich, Germany.

The affected product, SINEMA, is a network management appliance for industrial applications and allows network monitoring as well as diagnostics and reporting functions integrated into SCADA systems such as WinCC. According to Siemens, SINEMA products are deployed across several sectors including critical manufacturing, commercial facilities, government facilities, chemical, water and wastewater, energy, and others. Siemens estimates that these products are used primarily in the United States and Europe with a small percentage in Asia.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

CODE INJECTIONa

The integrated web servers at Port 4999/TCP and Port 80/TCP could allow unauthenticated remote code execution if an attacker has network access to the server.

CVE-2014-2731b has been assigned to this vulnerability. A CVSS v2 base score of 9.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:C/I:C/A:C).c

RELATIVE PATH TRAVERSALd

The integrated web servers at Port 4999/TCP and Port 80/TCP could allow unauthenticated directory traversal on the server based on the application’s file system permissions if an attacker has network access to the server.

CVE-2014-2732e has been assigned to this vulnerability. A CVSS v2 base score of 5.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:P/I:N/A:N).f

IMPROPER INPUT VALIDATIONg

An attacker could cause a denial of service of the SINEMA web interfaces at Port 4999/TCP and Port 80/TCP if specially crafted HTTP requests are sent to these ports. To recover the web interfaces, the SINEMA server has to be restarted via the SINEMAserver-Monitor.

CVE-2014-2733h  has been assigned to this vulnerability. A CVSS v2 base score of 5.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:N/I:N/A:P).i

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

An attacker with a low skill would be able to exploit these vulnerabilities.

MITIGATION

Siemens has provided a software update (V12 SP1) for SINEMA server that fixes these vulnerabilities. Users of these systems may find it at the following location at Siemens web site:

http://support.automation.siemens.com/WW/view/de/74758725

For more information on this vulnerability, please see Siemens Security Advisory SSA-364879 at the following location:

http://www.siemens.com/cert/advisories

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 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 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 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.


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

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