ICS Advisory (ICSA-13-225-01)

Advantech WebAccess Cross-Site Scripting

Click to Tweet.
Click to send to Facebook.
Click to Share.

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.



This advisory is a follow-up to the alert titled ICS-ALERT-13-009-01 Advantech WebAccess Cross-Site Scripting that was published January 9, 2013, on the ICS-CERT Web page. This advisory provides mitigation details for a vulnerability in Advantech’s WebAccess application.

Independent researcher Sanadi Antu identified a cross-site scripting vulnerability and released proof-of-concept (exploit) code for Advantech WebAccess application without coordination with ICS-CERT, the vendor, or any other coordinating entity known to ICS-CERT. Advantech has created a patch to mitigate this vulnerability.

This vulnerability could be exploited remotely.

Exploits that target this vulnerability are known to be publicly available.


Advantech reports that the vulnerability affects the following versions of WebAccess:

  • Advantech WebAccess 7.0 and prior.


Successful exploitation will allow a remote authenticated attacker to execute arbitrary HTML code in a user’s browser session in the context of a vulnerable application.

Impact to individual organizations depends on many factors that are unique to each organization. ICS‑CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.


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

Advantech WebAccess, formally known as BroadWin WebAccess, is a Web-based SCADA and human-machine interface product used in energy, critical manufacturing, and building automation systems (commercial and government facilities).  These systems are deployed globally.




Input sent from a malicious client is not properly verified by the server. By sending invalid input through the WebAccess Client interface, an attacker can execute arbitrary HTML and script code in another user’s browser session.

CVE-2013-2299b has been assigned to this vulnerability. A CVSS v2 base score of 6.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:S/C:N/I:C/A:N).c



This vulnerability could be exploited remotely.


Exploits that target this vulnerability are publicly available.


An attacker with a medium skill would be able to exploit this vulnerability.


Advantech has created a patch to mitigate this vulnerability. Users may download the latest version of WebAccess (V 7.1 2013.05.30) at the following location on the Advantech website:


Advantech has also created the following site to share additional information about WebAccess:


ICS‑CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.

  • Minimize network exposure for all control system devices. Critical devices should not directly face 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 VPN is only as secure as the connected devices.

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.d ICS‑CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.

Additional mitigation guidance and recommended practices are publicly available in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B—Targeted Cyber Intrusion Mitigation Strategies,e that is available for download from the ICS-CERT Web page (http://ics-cert.us-cert.gov/).

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.

  • aCWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting), http://cwe.mitre.org/data/definitions/79.html, Web site last accessed August 13, 2013.
  • bNVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2299, NIST uses this advisory to create the CVE Web site report. This Web site will be active sometime after publication of this advisory.
  • cCVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:S/C:N/I:C/A:N, Web site last accessed August 13, 2013.
  • dCSSP Recommended Practices, http://ics-cert.us-cert.gov/content/recommended-practices, Web site last accessed August 13, 2013.
  • eTargeted Cyber Intrusion Detection and Mitigation Strategies, http://ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B, Web site last accessed August 13, 2013.

Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.

This product is provided subject to this Notification and this Privacy & Use policy.

Please share your thoughts.

We recently updated our anonymous product survey; we'd welcome your feedback.