Fuji Electric V-Server

CVSS v3 7.3

**ATTENTION:**Remotely exploitable

Vendor: Fuji Electric

Equipment: V-Server

Vulnerability: Improper Restriction of Operations within the Bounds of a Memory Buffer

AFFECTED PRODUCTS

The following versions of V-Server, a data collection and management service, are affected:

• V-Server Version 3.3.22.0 and prior.

IMPACT

Successful exploitation of this memory corruption vulnerability could allow an attacker to remotely execute arbitrary code.

MITIGATION

Fuji Electric has produced a patch that can be found at:

<http://proself.hakko-elec.co.jp/public/EKzkQAiIvMzAVF0Bg-FcEz9DkGitzZP0H8fRbQ64QICh&gt;

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.

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

VULNERABILITY OVERVIEW

IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119

A memory corruption vulnerability has been identified, which may allow remote code execution.

CVE-2017-9639 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

RESEARCHER

Ariele Caltabiano working with Trend Micro’s Zero Day Initiative identified this vulnerability.

BACKGROUND

Critical Infrastructure Sector: Critical Manufacturing

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Japan