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             AUSCERT External Security Bulletin Redistribution

                Advantech WebAccess ActiveX Vulnerabilities
                               22 June 2016


        AusCERT Security Bulletin Summary

Product:           Advantech WebAccess
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-4528 CVE-2016-4525 

Original Bulletin: 

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Advisory (ICSA-16-173-01)

Advantech WebAccess ActiveX Vulnerabilities

Original release date: June 21, 2016

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Zhou Yu of Acorn Network Security has identified ActiveX vulnerabilities in 
Advantech WebAccess. Advantech has produced a new version to mitigate these 
vulnerabilities. Zhou Yu has tested the new version to validate that it 
resolves the vulnerabilities.


Advantech reports that the vulnerabilities affect the following versions of 

    WebAccess versions prior to 8.1_20160519


The vulnerabilities could allow an attacker who successfully exploits them to
insert and run arbitrary code on an affected system.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the 
impact of these vulnerabilities based on their operational environment, 
architecture, and product implementation.


Advantech is based in Taiwan and has distribution offices in 21 countries 

The affected product, WebAccess, formerly known as BroadWin WebAccess, is a 
web-based SCADA and human-machine interface (HMI) product. According to 
Advantech, WebAccess is deployed across several sectors including Commercial 
Facilities, Critical Manufacturing, Energy, and Government Facilities. 
Advantech estimates that this product is used globally.




Several ActiveX controls are intended for restricted use, but have been marked
as safe-for-scripting.

CVE-2016-4525 [b] has been assigned to these vulnerabilities. A CVSS v3 base 
score of 6.6 has been calculated; the CVSS vector string is 
(AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N). [c]


A specially crafted DLL file can cause a buffer overflow.

CVE-2016-4528 [e] has been assigned to these vulnerabilities. A CVSS v3 base 
score of 5.0 has been calculated; the CVSS vector string is 
(AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H). [f]



These vulnerabilities are not exploitable remotely and cannot be exploited 
without user interaction. The exploit is only triggered when a local user runs
the vulnerable application, which in certain scenarios can cause it to load a
DLL file from an untrusted source.


No known public exploits specifically target these vulnerabilities.


Crafting a working exploit for these vulnerabilities would be difficult. 
Social engineering is required to convince the user to accept a malformed DLL
file. Additional user interaction is needed to load the malformed file. This 
decreases the likelihood of a successful exploit.


Advantech has released a new version of WebAccess, Version 8.1_20160519, to 
address the reported vulnerabilities. This new version is available on the 
Advantech web site at the following location:

http://www.advantech.com/industrial-automation/webaccess (link is external)

ICS-CERT recommends that users take defensive measures to protect themselves 
from social engineering attacks. Specifically, users should:

Do not click web links or open unsolicited attachments in email messages.

Refer to Recognizing and Avoiding Email Scamsg for more information on 
avoiding email scams.

Refer to Avoiding Social Engineering and Phishing Attacksh for more 
information on social engineering attacks.

Do not visit untrusted web sites.

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: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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.

a. CWE-623: Unsafe ActiveX Control Marked Safe For Scripting, 
http://cwe.mitre.org/data/definitions/623.html, web site last accessed June 
21, 2016.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4525, 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, 
web site last accessed June 21, 2016.

d. CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer 
Overflow'), http://cwe.mitre.org/data/definitions/120.html, web site last 
accessed June 21, 2016.

e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4528, 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, 
web site last accessed June 21, 2016.

g. Recognizing and Avoiding Email Scams, 
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last 
accessed June 21, 2016.

h. National Cyber Alert System Cyber Security Tip ST04-014, 
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed June 21,

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

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 this 

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