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icsIndustrial Control Systems Cyber Emergency Response TeamICSA-17-355-01
HistoryDec 21, 2017 - 12:00 p.m.

Moxa NPort W2150A and W2250A

2017-12-2112:00:00
Industrial Control Systems Cyber Emergency Response Team
www.cisa.gov
34

6.4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:P/A:N

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

0.001 Low

EPSS

Percentile

50.0%

CVSS v3 6.5

**ATTENTION:**Remotely exploitable/low skill level to exploit.

Vendor: Moxa

Equipment: NPort W2150A and W2250A

Vulnerability: Credentials Management

AFFECTED PRODUCTS

The following versions of NPort, a serial network interface, are affected:

  • NPort W2150A Versions prior to 1.11, and
  • NPort W2250A Versions prior to 1.11.

IMPACT

Successful exploitation of this vulnerability could allow unauthorized access.

MITIGATION

Moxa has produced new firmware Version 2.1 for the affected devices that can be downloaded from:

https://www.moxa.com/support/download.aspx?type=support&id=14781

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 ICSโ€‘CERT Technical Information Paper, ICS-TIP-12-146-01Bโ€“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

CREDENTIALS MANAGEMENT CWE-255

The default password is empty on the device. An unauthorized user can access the device without a password. An unauthorized user has the ability to completely compromise the confidentiality and integrity of the wireless traffic.

CVE-2017-16727 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

RESEARCHER

Federico Maggi reported the vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, and Transportation Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Taiwan

References

6.4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:P/A:N

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

0.001 Low

EPSS

Percentile

50.0%

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