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 7.5
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: PHOENIX CONTACT, Innominate Security Technologies
Equipment: mGuard firmware
Vulnerability: Null Pointer Dereference
The following versions of mGuard firmware versions 8.0.0 to 8.5.1, running on these mGuard Network Security Appliances, are affected:
- FL MGUARD RS4000 TX/TX VPN,
- FL MGUARD GT/GT,
- FL MGUARD GT/GT VPN,
- FL MGUARD RS4000 TX/TX,
- FL MGUARD SMART2 VPN,
- FL MGUARD SMART2,
- FL MGUARD RS2000 TX/TX VPN,
- FL MGUARD DELTA TX/TX,
- FL MGUARD DELTA TX/TX VPN,
- FL MGUARD PCI4000,
- FL MGUARD PCI4000 VPN,
- FL MGUARD PCIE4000 VPN,
- FL MGUARD RS2005 TX VPN,
- FL MGUARD RS4004 TX/DTX,
- FL MGUARD RS4004 TX/DTX VPN,
- FL MGUARD RS4000 TX/TX-P,
- FL MGUARD RS4000 TX/TX VPN-M,
- FL MGUARD CENTERPORT,
- FL MGUARD RS,
- FL MGUARD RS VPN ANALOG,
- TC MGUARD RS2000 3G VPN,
- TC MGUARD RS4000 3G VPN,
- TC MGUARD RS2000 4G VPN, and
- TC MGUARD RS4000 4G VPN.
Successful exploitation of this vulnerability could allow attackers to cause a remote denial of service and force a restart of all IPSec connections.
PHOENIX CONTACT and Innominate Security Technologies recommend all users running mGuard devices with affected firmware versions to update to firmware Version 8.5.2 or higher, which fixes this vulnerability. Links to updates and additional information can be found in the CERT@VDE advisory at the following location:
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. This vulnerability is remotely exploitable.
Openswan 2.6.39 and earlier, which is used in the mGuard firmware version 8.0.0 to 8.5.1, allows remote attackers to cause a denial of service (NULL pointer dereference and IKE daemon restart) via IKEv2 packets that lack expected payloads.
PHOENIX CONTACT has reported this vulnerability via CERT@VDE to ICS-CERT.
Critical Infrastructure Sectors: Communications, Critical Manufacturing, Information Technology
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.