ICS Advisory (ICSA-18-128-03)

Siemens Siveillance VMS Video Mobile App

Click to Tweet.
Click to send to Facebook.
Click to Share.

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/.



  • CVSS v3 4.8
  • ATTENTION: Exploitable remotely
  • Vendor: Siemens
  • Equipment: Siveillance VMS Video Mobile App
  • Vulnerability: Improper Certificate Validation


Successful exploitation of this vulnerability may allow an attacker in a privileged network position to read data from and write data to the encrypted communication channel between the app and a server.



Siemens reports that the vulnerability affects the following Siveillance VMS Video Mobile Apps:

  • Siveillance VMS Video for Android, all versions prior to V12.1a (2018 R1), and
  • Siveillance VMS Video for iOS: all versions prior to V12.1a (2018 R1)



Improper certificate validation could allow an attacker in a privileged network position to read data from and write data to the encrypted communication channel between the app and a server.

The vulnerability could be exploited by an attacker in a privileged network position, which allows interception of the communication channel between the affected app and a server (such as man-in-the-middle). However, an attacker must be able to generate a certificate that results for the validation algorithm in a checksum identical to a trusted certificate.

CVE-2018-4849 has been assigned to this vulnerability. A CVSS v3 base score of 4.8 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).


  • Critical Infrastructure Sectors: Commercial facilities
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: Germany


Karsten Sohr from TZI Bremen reported this vulnerability to Siemens.


Siemens has provided the following updates and recommends that all users update to the newest version:

  • Siveillance VMS Video for Android: Update to V12.1a (2018 R1)


  • Siveillance VMS Video for iOS: Update to V12.1a (2018 R1)


As a general security measure Siemens strongly recommends users protect network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

For more information on this vulnerability and associated mitigation practices, please see the Siemens security advisory SSA-468514 on their website:


NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:

  • 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.

NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:

No known public exploits specifically target this vulnerability. High skill level is needed to exploit.

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.