|2016-06-21||HMI||Advantech WebAccess||Zhou Yu||N/A||2016-4525, 2016-4528||N/A||N/A||N/A|
# Advantech WebAccess ActiveX Vulnerabilities
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.
### AFFECTED PRODUCTS
Advantech reports that the vulnerabilities affect the following versions of WebAccess:
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 worldwide.
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.
### VULNERABILITY CHARACTERIZATION
# VULNERABILITY OVERVIEW
UNSAFE ACTIVEX CONTROL MARKED SAFE-FOR-SCRIPTING
Several ActiveX controls are intended for restricted use, but have been marked as safe-for-scripting.
CVE-2016-4525 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).
CLASSIC BUFFER OVERFLOW
A specially crafted DLL file can cause a buffer overflow.
CVE-2016-4528 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).
### VULNERABILITY DETAILS
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.
# EXISTENCE OF EXPLOIT
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: