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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
Operating System: Windows
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Cross-site Request Forgery -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2017-7917 CVE-2017-7915 CVE-2017-7913
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Original release date: May 23, 2017
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CVSS v3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
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,
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-HSPA, and
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.
IMPROPER RESTRICTION OF EXCESSIVE AUTHENTICATION ATTEMPTS CWE-307
An attacker can freely use brute force to determine parameters needed to
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
PLAINTEXT STORAGE OF A PASSWORD CWE-256
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
CROSS-SITE REQUEST FORGERY CWE-352
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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