-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2855
                     Moxa NPort Device Vulnerabilities
                              5 December 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Moxa NPort Device
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise   -- Remote/Unauthenticated      
                   Cross-site Request Forgery -- Remote with User Interaction
                   Denial of Service          -- Remote/Unauthenticated      
                   Cross-site Scripting       -- Remote with User Interaction
                   Access Confidential Data   -- Existing Account            
                   Reduced Security           -- Existing Account            
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9371 CVE-2016-9369 CVE-2016-9367
                   CVE-2016-9366 CVE-2016-9365 CVE-2016-9363
                   CVE-2016-9361 CVE-2016-9348 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-336-02

- --------------------------BEGIN INCLUDED TEXT--------------------

Advisory (ICSA-16-336-02)

Moxa NPort Device Vulnerabilities 

Original release date: December 01, 2016 

Legal Notice 

All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/.

OVERVIEW 

This advisory is a follow-up to the alert titled ICS-ALERT-16-099-01B
Moxa NPort Device Vulnerabilities that was published April 8, 2016, on the 
NCCIC/ICS-CERT web site. 

Security researchers Reid Wightman of RevICS Security, Mikael Vingaard, and 
Maxim Rupp have identified vulnerabilities in Moxas NPort serial device servers. 
Moxa has produced new firmware versions to mitigate these vulnerabilities. 

These vulnerabilities could be exploited remotely. 

AFFECTED PRODUCTS 
Moxa reports that the vulnerability affects the 
following versions of NPort: 

NPort 5110 versions prior to 2.6, 
NPort 5130/5150 Series versions prior to 3.6, 
NPort 5200 Series versions prior to 2.8, 
NPort 5400 Series versions prior to 3.11, 
NPort 5600 Series versions prior to 3.7, 
NPort 5100A Series & NPort P5150A versions prior to 1.3, 
NPort 5200A Series versions prior to 1.3, 
NPort 5150AI-M12 Series versions prior to 1.2, 
NPort 5250AI-M12 Series versions prior to 1.2, 
NPort 5450AI-M12 Series versions prior to 1.2, 
NPort 5600-8-DT Series versions prior to 2.4, 
NPort 5600-8-DTL Series versions prior to 2.4, 
NPort 6x50 Series versions prior to 1.13.11, 
NPort IA5450A versions prior to v1.4 

IMPACT 

Successful exploitation of these vulnerabilities could lead to the complete 
compromise of an affected system.
 
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of these vulnerabilities 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 products, 
NPort devices, connect serial devices to Ethernet networks. According to Moxa,
NPort devices are deployed across several sectors including Critical 
Manufacturing, Energy, and Transportation Systems. Moxa estimates that these 
products are used worldwide. 

VULNERABILITY CHARACTERIZATION 

VULNERABILITY OVERVIEW 

CREDENTIALS MANAGEMENT[a] 

Administration passwords can be retried without authenticating. 
CVE-2016-9361[b] has been assigned to this vulnerability. A CVSS v3 base score 
of 9.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[c] 

PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS[d] 

Firmware can be updated over the network 
without authentication, which may allow remote code execution. CVE-2016-9369[e]
has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been
calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[f]

CLASSIC BUFFER OVERFLOW[g] 

Buffer overflow vulnerability may allow an 
unauthenticated attacker to remotely execute arbitrary code. CVE-2016-9363[h] 
has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been
calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).[i]

CROSS-SITE SCRIPTING[j] 

User-controlled input is not neutralized before being 
output to web page. CVE-2016-9371[k] has been assigned to this vulnerability. A
CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).[l] 

CROSS-SITE REQUEST FORGERY[m] 

Requests are not verified to be intentionally submitted by the proper user. 
CVE-2016-9365[n] has been assigned to this vulnerability. A CVSS v3 base score 
of 8.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).[o] 

IMPROPER RESTRICTION OF EXCESSIVE AUTHENTICATION ATTEMPTS[p]
 
An attacker can freely use brute force to determine 
parameters needed to bypass authentication. CVE-2016-9366[q] has been assigned 
to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the 
CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[r] 

PLAIN TEXT STORAGE OF A PASSWORD[s] 

A configuration file contains parameters that represent
passwords in plaintext. CVE-2016-9348[t] has been assigned to this 
vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS 
vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).[u] 

RESOURCE EXHAUSTION[v]

The amount of resources requested by a malicious actor is not restricted, 
leading to a denial-of-service caused by resource exhaustion. CVE-2016-9367[w] 
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:N/I:N/A:H).[x]

VULNERABILITY DETAILS 

EXPLOITABILITY 

These vulnerabilities could be exploited remotely. 

EXISTENCE OF EXPLOIT 

No known public exploits specifically target these vulnerabilities. 

DIFFICULTY 

An attacker with low skill would be able to exploit these vulnerabilities. 

MITIGATION 

Moxa has released new firmware versions, which address the identified 
vulnerabilities in all but one of the affected NPort devices. Moxa recommends 
installing the new firmware version. 

NPort 5110 Version 2.6: 
http://www.moxa.com/support/download.aspx?type=support&id=882 (link is 
external) 

NPort 5130/5150 Series Version 3.6: 
http://www.moxa.com/support/download.aspx?type=support&id=356 (link is 
external) 

NPort 5200 Series Version 2.8: 
http://www.moxa.com/support/download.aspx?type=support&id=904 (link is 
external) 

NPort 5400 Series Version 3.11: 
http://www.moxa.com/support/download.aspx?type=support&id=925 (link is 
external) 

NPort 5600 Series Version 3.7: 
http://www.moxa.com/support/download.aspx?type=support&id=905 (link is 
external) 

NPort 5100A Series & NPort P5150A Version 1.3: 
http://www.moxa.com/support/download.aspx?type=support&id=1403 (link is 
external) 

NPort 5200A Series Version 1.3: 
http://www.moxa.com/support/download.aspx?type=support&id=1462 (link is 
external) 

NPort 5150AI-M12 Series Version 1.2: 
http://www.moxa.com/support/download.aspx?type=support&id=2206 (link is 
external) 

NPort 5250AI-M12 Series Version 1.2: 
http://www.moxa.com/support/download.aspx?type=support&id=2207 (link is 
external) 

NPort 5450AI-M12 Series Version 1.2: 
http://www.moxa.com/support/download.aspx?type=support&id=2208 (link is 
external) 

NPort 5600-8-DT Series Version 2.4: 
http://www.moxa.com/support/download.aspx?type=support&id=938 (link is 
external) 

NPort 5600-8-DTL Series Version 1.3: 
http://www.moxa.com/support/download.aspx?type=support&id=1819 (link is 
external) 

NPort 6x50 Series Version 1.14: 
http://www.moxa.com/support/download.aspx?type=support&id=733 (link is 
external) 

NPort IA5450A Version 1.4: 
http://www.moxa.com/support/download.aspx?type=support&id=1469 (link is 
external) 

Moxa has reported that the NPort 6110 device was discontinued in 
December 2008 and will not have patches released to address these 
vulnerabilities. Moxa recommends that customers using the NPort 6110 should 
upgrade the affected device. 

ICS-CERT recommends that users take defensive 
measures to minimize the risk of exploitation of these vulnerabilities. 
Specifically, users should: 

Ensure that Ports 161/UDP, 4800/UDP, and 4900/TCP
are only accessible by trusted systems and that restricting access to Ports 
4800/UDP and 4900/TCP will impact remote systems administration. 

Ensure that all unused ports are disabled. 

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 onthe 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. 

a. CWE-255: Credentials Management, 
http://cwe.mitre.org/data/definitions/255.html, web site last accessed 
December 01, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9361, 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, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016.
d. CWE-264: Permissions, Privileges, and Access Controls, 
http://cwe.mitre.org/data/definitions/264.html, web site last accessed 
December 01, 2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9369, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
f. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016.
g. CWE-120: Buffer Copy without Checking Size of Input 
('Classic Buffer Overflow'), http://cwe.mitre.org/data/definitions/120.html, 
web site last accessed December 01, 2016.
h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9363, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
i. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016.
j. CWE-79: Improper Neutralization of Input During Web Page Generation 
('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html, web 
site last accessed December 01, 2016.
k. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9371, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
l. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S..., 
web site last accessed December 01, 2016.
m. CWE-352: Cross-Site Request Forgery (CSRF), 
http://cwe.mitre.org/data/definitions/352.html, web site last accessed 
December 01, 2016.
n. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9365, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
o. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S..., 
web site last accessed December 01, 2016.
p. CWE-307: Improper Restriction of Excessive Authentication Attempts, 
http://cwe.mitre.org/data/definitions/307.html, web site last accessed 
December 01, 2016.
q. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9366, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
r. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016.
s. CWE-256: Plain Text Storage of a Password, 
http://cwe.mitre.org/data/definitions/256.html, web site last accessed 
December 01, 2016.
t. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9348, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.
u. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S..., 
web site last accessed December 01, 2016.
v. CWE-400: Uncontrolled Resource Consumption ("Resource Exhaustion"), 
http://cwe.mitre.org/data/definitions/400.html, web site last accessed 
December 01, 2016.
w. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9367, 
NIST uses this advisory to create the CVE web site report. This web site will 
be active sometime after publication of this advisory.
x. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=TUPZ
-----END PGP SIGNATURE-----