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             AUSCERT External Security Bulletin Redistribution

                   Advisory (ICSA-17-143-01) Moxa OnCell
                                24 May 2017


        AusCERT Security Bulletin Summary

Product:           Moxa OnCell
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Increased Privileges       -- Remote/Unauthenticated      
                   Cross-site Request Forgery -- Remote with User Interaction
                   Access Confidential Data   -- Remote/Unauthenticated      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-7917 CVE-2017-7915 CVE-2017-7913

Original Bulletin: 

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Advisory (ICSA-17-143-01)

Moxa OnCell

Original release date: May 23, 2017

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CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Moxa

Equipment: OnCell

Vulnerabilities: Improper Restriction of Excessive Authentication Attempts, 
Plaintext Storage of a Password, and Cross-Site Request Forgery


The following versions of OnCell, a high-speed industrial-grade IP gateway, 
are affected:

    OnCell G3110-HSPA Version 1.3 build 15082117 and previous versions,
    OnCell G3110-HSDPA Version 1.2 Build 09123015 and previous versions,
    OnCell G3150-HSDPA Version 1.4 Build 11051315 and previous versions,
    OnCell 5104-HSDPA,
    OnCell 5104-HSPA, and
    OnCell 5004-HSPA.


Successful exploitation of these vulnerabilities may allow an attacker to use
brute force to determine parameters needed to access the application. An 
attacker may also obtain credentials by obtaining files that store passwords 
in clear text.


Moxa recommends the following mitigations:

For OnCell G31x0-HSPA and OnCell 5x04-HSPA devices users should upgrade to
the latest official firmware Version 1.4 or above.

For OnCell G31x0-HSDPA and OnCell 5x04-HSDPA devices users should disable
HTTP and use other another console such as HTTPS to access web UI or 
SNMP/Telnet. Moxa reports that the HSDPA devices have been phased out. If 
further assistance is needed, please contact Moxa.

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the 
risk of exploitation of these vulnerabilities. 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 ICSCERT 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 these vulnerabilities.



An attacker can freely use brute force to determine parameters needed to 
bypass authentication.

CVE-2017-7915 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is 


The applications configuration file contains parameters that represent 
passwords in plaintext.

CVE-2017-7913 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been assigned; the CVSS vector string is 


The application does not sufficiently verify if a request was intentionally 
provided by the user who submitted the request, which could allow an attacker
to modify the configuration of the device.

CVE-2017-7917 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is 


Independent researcher Maxim Rupp identified the vulnerabilities.


Critical Infrastructure Sectors: Commercial Facilities, Critical 
Manufacturing, Energy, Transportation Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Taiwan

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