Date: 22 February 2016
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AUSCERT External Security Bulletin Redistribution
A vulnerability has been identified in B+B SmartWorx VESP211
22 February 2016
AusCERT Security Bulletin Summary
Product: B+B SmartWorx VESP211
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2016-2275
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B+B SmartWorx VESP211 Authentication Bypass Vulnerability
Original release date: February 18, 2016
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Independent researcher Maxim Rupp has identified an authentication bypass
vulnerability in B+B SmartWorx's VESP211 serial servers. B+B SmartWorx
has produced an implementation plan to mitigate this vulnerability.
This vulnerability could be exploited remotely.
The following VESP211 serial servers are affected:
Model: VESP211-EU Firmware Version: 1.7.2,
Model: VESP211-232 Firmware Version: 1.7.2, and
Model: VESP211-232 Firmware Version: 1.5.1
Successful exploitation of this vulnerability may allow attackers to
perform administrative operations over the network without authentication.
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.
B+B SmartWorx is a US-based company that has additional offices located
in Ireland and the Czech Republic. In January, B+B SmartWorx merged with
Advantech, a Taiwan-based company.
The affected products, VESP211 serial servers, are an interface for
connecting serial devices to an Ethernet network. According to B+B SmartWorx,
the VESP211 serial servers are deployed across several sectors including
Energy, Telecommunications, and Transportation. B+B SmartWorx estimates
that these products are used primarily in North America with a smaller
percentage in Europe and South America.
USE OF CLIENT-SIDE AUTHENTICATION[a]
unauthorized users to a login page. By intercepting and change requests, an
unauthenticated user may bypass authentication and access restricted pages.
CVE-2016-2275[b] has been assigned to this vulnerability. A CVSS
v3 base score of 9.8 has been assigned; the CVSS vector string is
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
Advantech/B+B recommends the VESP211 serial servers only be operated behind
a local network firewall.
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.
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 at:
recommended practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
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.
CWE-603: Use of Client-Side Authentication,
http://cwe.mitre.org/data/definitions/603.html, web site last accessed
February 18, 2016.
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
web site last accessed February 18, 2016.
For any questions related to this report, please contact ICS-CERT at:
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
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