Fuji Electric V-Server

1. EXECUTIVE SUMMARY

• CVSS v3 7.3
• ATTENTION: Exploitable remotely/low skill level to exploit/public exploits are available
• Vendor: Fuji Electric
• Equipment: V-Server
• Vulnerabilities: Use-After Free, Untrusted Pointer Dereference, Heap-based Buffer Overflow, Out-of-Bounds Write, Integer Underflow, Out-of-Bounds Read, and Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow for remote code execution on the device, causing a denial of service condition or information exposure.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

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

• V-Server 4.0.3.0 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1    USE AFTER FREE CWE-416

A use after free vulnerability has been identified, which may allow remote code execution.

CVE-2018-14809 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.2    UNTRUSTED POINTER DEREFERENCE CWE-822

Multiple untrusted pointer dereference vulnerabilities have been identified, which may allow remote code execution.

CVE-2018-14811 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.3    HEAP-BASED BUFFER OVERFLOW CWE-122

A heap-based buffer overflow vulnerability has been identified, which may allow remote code execution.

CVE-2018-14813 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.4    OUT-OF-BOUNDS WRITE CWE-787

Several out-of-bounds write vulnerabilities have been identified, which may allow remote code execution.

CVE-2018-14815 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.5    INTEGER UNDERFLOW CWE-191

An integer underflow vulnerability has been identified, which may allow remote code execution.

CVE-2018-14817 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.6    OUT-OF-BOUNDS READ CWE-125

An out-of-bounds read vulnerability has been identified, which may allow remote code execution.

CVE-2018-14819 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.7    STACK-BASED BUFFER OVERFLOW CWE-121

A stack-based buffer overflow vulnerability has been identified, which may allow remote code execution.

CVE-2018-14823 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Japan

3.4 RESEARCHER

Steven Seeley (mr_me) of Source Incite and Ghirmay Desta working with Trend Micro’s Zero Day Initiative reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Fuji Electric has released Version 4.0.4.0 of the software that can be downloaded from (login required):

http://monitouch.fujielectric.com/site/support-e/download-index-01.html

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.

• Fuji Electric