Legal Notice
All information products included in https://us-cert.cisa.gov/ics 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 https://us-cert.cisa.gov/tlp/.
Summary
This Alert Update is a follow-up to the original ICS-CERT Alert titled “ICS-ALERT-11-332-01—Siemens Automatic License Manager” that was published November 28, 2011 on the ICS-CERT web page.
ICS-CERT is aware of a public report of four vulnerabilities with proof-of-concept (PoC) exploit code affecting the Siemens Automation License Manager (ALM). According to this report, the vulnerabilities are remotely exploitable. This report was released by Luigi Auriemma without coordination with Siemens, ICS-CERT, or any other coordinating entity known to ICS-CERT.
ICS-CERT has coordinated the report with Siemens, who is working to confirm the report and identify mitigations. ICS-CERT is issuing this alert to provide early notice of the report and identify baseline mitigations for reducing risks to these and other cybersecurity attacks.
--------- Begin Update A Part 1 of 1 --------
The ALM is a component of Siemens industrial software and is necessary for licensing Siemens supervisory control and data acquisition (SCADA), human-machine interface (HMI), and engineering software.
The report includes vulnerability details and PoC exploit code for four vulnerabilities. Siemens has analyzed the vulnerability report and offered the following vulnerability characterization information.
Vulnerability Type | Exploitability | Impact |
---|---|---|
Buffer Overflow | Remote | Denial of Service (DoS) / Possible Remote Code Execution |
Exception | Remote | DoS |
Exception | Remote | DoS |
Improper Input Validation | Remote | Write access to file system allowing arbitrary file deletion |
--------- End Update A Part 1 of 1 ----------
Please report any issues affecting control systems in critical infrastructure environments to ICS-CERT.
Follow-Up
ICS-CERT released a follow-up advisory, ICSA-11-361-01—Siemens Automatic License Manager, to the ICS-CERT Web site on December 27, 2011.
Mitigation
ICS-CERT is currently coordinating with Siemens to identify mitigations.
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. Control system devices should not directly face the Internet.a
- Locate control system networks and devices behind firewalls, and isolate them from the business network.
- If remote access is required, employ secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.
The Control Systems Security Program (CSSP) also provides a recommended practices section for control systems on the US-CERT website. Several recommended practices are available for reading or download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Organizations that observe 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. ICS-CERT ALERT, http://ics-cert.us-cert.gov/alerts/ICS-ALERT-10-301-01, website last accessed December 01, 2011.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.
This product is provided subject to this Notification and this Privacy & Use policy.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.