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Advisory (ICSA-15-008-02)

Schneider Electric Wonderware InTouch Access Anywhere Server Buffer Overflow Vulnerability

Original release date: January 08, 2015 | Last revised: May 28, 2015

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OVERVIEW

Schneider Electric Wonderware has identified a stack-based buffer overflow vulnerability in the Wonderware InTouch Access Anywhere Server product. Schneider Electric has produced a security update that mitigates this vulnerability.

This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

The following Wonderware InTouch Access Anywhere Server versions are affected:

  • InTouch Access Anywhere Server, Version 10.6, and
  • InTouch Access Anywhere Server, Version 11.0.

IMPACT

The successful exploitation of this vulnerability could cause a buffer overflow that may allow arbitrary code execution.

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.

BACKGROUND

Schneider Electric corporate headquarters is located in Paris, France, and maintains offices in more than 100 countries worldwide.

The affected product, Wonderware InTouch Access Anywhere Server, provides access to InTouch applications through a web browser. According to Schneider Electric, Wonderware InTouch Access Anywhere Server is deployed across several sectors including Chemical, Critical Manufacturing, Energy, Food and Agriculture, and Water and Wastewater Systems. Schneider Electric estimates that the Wonderware InTouch Access Anywhere Server product is used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOWa

An attacker could cause a stack-based buffer overflow by requesting a nonexistent file that may enable the execution of arbitrary code.

CVE-2014-9190b has been assigned to this vulnerability. A CVSS v2 base score of 10 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).c

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

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

MITIGATION

Schneider Electric has released a security update that mitigates the stack-based buffer overflow vulnerability in Wonderware’s InTouch Access Anywhere Server product, Versions 10.6 and 11.0. Schneider Electric’s security updates for Version 10.6 and Version 11.0 are available at the following location with a user account:

https://wdnresource.wonderware.com/tracking/confirmdownload.aspx?id=3001&url=https://wdnresource.wonderware.com/support/patchfixes/1/WW-ITAA2014P01-LFSEC104.zip&rme=https://wdnresource.wonderware.com/support/patchfixes/1/WW-ITAA2014P01-LFSEC104.txt

Schneider Electric has released a security bulletin titled “InTouch Access Anywhere Server Security Vulnerability, LFSEC00000104” to announce the security update, which is available at the following location:

https://gcsresource.invensys.com/support/docs/_SecurityBulletins/Security_Bulletin_LFSEC00000104.pdf

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 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 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying 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 Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).


Contact Information

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

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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