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Advisory (ICSA-17-136-03)

Hanwha Techwin SRN-4000

Original release date: May 16, 2017

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CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit

Vendor: Hanwha Techwin

Equipment: SRN-4000

Vulnerability: Unauthenticated Access

AFFECTED PRODUCTS

The following versions of SRN-4000, a network video management platform, are affected:

  • SRN-4000 firmware versions prior to SRN4000_v2.16_170401.

IMPACT

Successful exploitation of this vulnerability could allow the attacker remote access to the web management portal with admin privileges without authentication.

MITIGATION

Hanwha Techwin recommends that users update to firmware Version SRN4000_v2.16_170401.zip or newer.

The latest firmware version can be obtained from the following location:

https://www.hanwha-security.com/

(Products > Video Recorders > SRN-4000 > Download > Firmware)

NCCIC/ICS-CERT recommends that 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.

ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

ICS-CERT 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 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.

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.

No known public exploits specifically target this vulnerability.

VULNERABILITY OVERVIEW

A specially crafted http request and response could allow an attacker to gain access to the device management page with admin privileges without proper authentication.

CVE-2017-7912 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

RESEARCHER

Can Demirel and Faruk Unal of Biznet Bilisim discovered the vulnerability and have tested the patch.

BACKGROUND

Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, Energy, Water and Wastewater Systems.

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Seoul, South Korea


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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