OVERVIEW

Innominate mGuard has self identified a denial-of-service (DoS) vulnerability in the Innominate mGuard device. Inominate has produced a patch to mitigate this vulnerability.

This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

The following mGuard versions are affected:

• Innominate mGuard firmware, Version 8.0.0 to Version8.1.6.

IMPACT

Successful exploitation of this vulnerability could result in a DoS condition.

Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.

BACKGROUND

Innominate is a German-based company that sells products worldwide through its international partners.

The affected products, the mGuard family of products, are industrial security routers. They can be found in many critical infrastructure sectors, including Communications, Critical Manufacturing, and Healthcare and Public Health.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

DOS OF VPN DAEMONa

It is possible to cause a temporary DoS condition on the VPN daemon on the VPN waiting side if the VPN initiating peer has the option “IPsec compression” enabled.

CVE-2015-3966b has been assigned to this vulnerability. A CVSS v2 base score of 7.8 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:N/I:N/A:C).c

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

An attacker with a low skill would be able to exploit this vulnerability.

MITIGATION

Innominate has released firmware patches for the affected versions, Versions 8.0.0 through 8.1.6 that mitigate the vulnerability in the mGuard firmware. Innominate recommends that customers using firmware versions older than Version 7, which are no longer being maintained, should upgrade to mGuard firmware Version 8.1.7. Innominate also recommends that customers limit access to the administrative interfaces to a minimum via firewall rules.

For additional information on the vulnerability, Innominate’s security advisory is available on its web site at:

http://www.innominate.com/data/downloads/software/innominate_security_advisory_20150714_001_en.pdf

Innominate’s firmware updates are available on its web site at:

http://www.innominate.com/en/downloads/updates.

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 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 at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 (http://ics-cert.us-cert.gov/).

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.

• a. CWE-272: Least Privilege Violation https://cwe.mitre.org/data/definitions/272.html, web site last accessed August 27, 2015.
• b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-3966, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory.
• c. CVSS Calculator http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:N/I:N/A:C web site last accessed August 27, 2015.