SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-480213156] Moxa MGate Authentication Bypass Vulnerability

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2016-07-14OTHERMoxa MGateMaxim RuppN/A2016-5804N/AN/AN/A

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# Moxa MGate Authentication Bypass Vulnerability
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### OVERVIEW

Independent researcher Maxim Rupp has identified an authentication bypass vulnerability in Moxa's MGate products. Moxa has produced new firmware versions to mitigate this vulnerability.

This vulnerability could be exploited remotely.




### AFFECTED PRODUCTS

Moxa reports that the vulnerability affects the following products:

MGate MB3180, versions prior to v1.8,
MGate MB3280, versions prior to v2.7,
MGate MB3480, versions prior to v2.6,
MGate MB3170, versions prior to v2.5, and
MGate MB3270, versions prior to v2.7






### IMPACT

A successful exploit of this vulnerability may allow an attacker to log in as a valid user.

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

Moxa is a Taiwan-based company that maintains offices in several countries around the world, including the US, UK, India, Germany, France, China, Russia, and Brazil.

The affected product, MGate, is a serial to Ethernet modbus gateway. According to Moxa, MGate is deployed across several sectors, including Chemical, Commercial Facilities, Critical Manufacturing, Emergency Services, Energy, Food and Agriculture, Government Facilities, and Water and Wastewater Systems. Moxa estimates that this product is used globally but concentrated in the US, Europe, South America, and Taiwan.





### VULNERABILITY CHARACTERIZATION


# VULNERABILITY OVERVIEW

INADEQUATE ENCRYPTION STRENGTH

An attacker can use accessible information to brute force a parameter that will allow a bypass of authentication mechanisms.
CVE-2016-5804 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).





### 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

Moxa has released new versions of firmware, which has enhanced the security of the MB3x70 and MB3x80 families. 
This new firmware can be located on its web site at the following locations:

MB3180, v1.8, MB3280, v2.7, and MB3480, v2.6
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=73&type_id=4

MB3170, v2.5 and MB3270, v2.7
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=74&type_id=4