SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-980868550] Moxa Device Server Web Console Authorization Bypass Vulnerability

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2016-07-07OTHERMoxa Device Server Web Console 5232-NMaxim RuppN/A2016-4503N/AN/AN/A

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# Moxa Device Server Web Console Authorization Bypass Vulnerability
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### OVERVIEW

Independent researcher Maxim Rupp has identified an authorization bypass vulnerability in Moxa's Device Server Web Console. Moxa has indicated the NPort 5232-N was discontinued in 2012 and has produced recommendations to mitigate this vulnerability.

This vulnerability could be exploited remotely.




### AFFECTED PRODUCTS

The following Device Server Web Console 5232-N versions are affected:
Device Server Web Console 5232-N, all versions.





### IMPACT

An attacker could exploit this vulnerability to gain access to change settings and data on the target device.

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, Device Server Web Console 5232-N, is a serial to Ethernet device. According to Moxa, Device Server Web Console devices are deployed across several sectors, including Commercial Facilities and Energy. Moxa estimates that this product is used primarily in the United States, Europe, and Asia.





### VULNERABILITY CHARACTERIZATION


# VULNERABILITY OVERVIEW

AUTHORIZATION BYPASS

An attacker could identify an authenticated UserId from a parameter passed in a cookie and gain access.
CVE-2016-4503 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 recommends disabling Ports 80/TCP (HTTP) and 23/TCP (TELNET). Moxa indicates that users should ensure that Ports 161/UDP (SNMP), 4800/UDP (utility), and 4900/TCP (utility) are only accessible by trusted systems and that restricting access to Ports 4800/UDP and 4900/TCP will impact remote systems administration.