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AUSCERT External Security Bulletin Redistribution
ESB-2013.0430
ICSA-13-080-01 INVENSYS WONDERWARE WIN-XML EXPORTER IMPROPER
INPUT VALIDATION VULNERABILITY
25 March 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Invensys Wonderware
Publisher: US-CERT
Operating System: Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2012-4710
Original Bulletin:
http://ics-cert.us-cert.gov/pdf/ICSA-13-080-01.pdf
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ICS-CERT ADVISORY
ICSA-13-080-01 INVENSYS WONDERWARE WIN-XML EXPORTER IMPROPER INPUT VALIDATION
VULNERABILITY
March 21, 2013
This advisory was originally posted to the US-CERT secure Portal library on
March 08, 2013, and is now being released to the ICS-CERT Web page. This
advisory provides mitigation details for a vulnerability that impacts the
Invensys Wonderware Win-XML Exporter. Independent researchers Timur Yunusov,
Alexey Osipov, and Ilya Karpov of the Positive Technologies Research Team have
discovered an improper input validation vulnerability in the Invensys
Wonderware Win-XML Exporter. Invensys has released a patch that mitigates the
vulnerability. The Positive Technologies Research Team has validated that the
patch fixes the vulnerability. Exploitation of this vulnerability could impact
systems deployed in the critical manufacturing, energy, food and beverage,
chemical, and water and wastewater sectors.
AFFECTED PRODUCTS
The following Invensys Wonderware products are affected:
* Win-XML Exporter Version 1522, 148, 0, 0, and possibly earlier versions.
IMPACT
Successful exploitation of this vulnerability could allow an attacker to
affect the confidentiality and availability of the Wonderware Win-XML
Exporter.
This product is 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
http://www.us-cert.gov/tlp/
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.
BACKGROUND
Invensys is a global technology company that works with industrial,
commercial, rail operators, and appliance operators, while operating in over
180 countries. Invensys develops software, systems, and equipment that enable
users to monitor, automate, and control their processes.
The Invensysa Wonderware Win-XML Exporter is used in many industries
worldwide, including critical manufacturing, energy, food and beverage,
chemical, and water and wastewater.
The Wonderware Win-XML Exporter converts interface windows from Intouch HMI
projects and displays them in Internet Explorer with the help of Wonderware
Information Server.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
IMPROPER INPUT VALIDATION [b]
Wonderware Win-XML Exporter allows access to local resources (files and
internal resources) via unsafe parsing of XML external entities. By using
specially crafted XML files, an attacker can cause Wonderware Win-XML Exporter
to send the contents of local or remote resources to the attackers server or
cause a denial of service of the system.
CVE-2012-4710 [c] has been assigned to this vulnerability. A CVSS v2 base
score of 6.3 has been assigned; the CVSS vector string is
(AV:L/AC:M/Au:N/C:C/I:N/A:C). [d]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely and cannot be exploited without
user interaction. The exploit is only triggered when a local user runs the
vulnerable application and loads the malformed XML files.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a medium skill would be able to exploit this vulnerability.
MITIGATION
Invensys has developed an update to the Win-XML Exporter that mitigates this
vulnerability. The Positive Technologies Research Team has tested the update
and validated that it fixes the vulnerability. Instructions and a link to the
update are found on the Invensys download page.e According to Invensys, any
machine running one or more of the products listed above is affected and
should be patched. No other components of the Wonderware installed products
are affected. Users should install the update using instructions provided in
the ReadMe file for the product and component being installed. Invensys
recommends that users:
* Read the installation instructions provided with the patch.
* Shut down any of the affected software products.
* Install the update.
* Restart the software.
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. [f] 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 Detection and Mitigation
Strategies,[g] that is available for download from the ICS-CERT Web page
(www.ics-cert.org).
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.
ICS-CERT CONTACT
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov Toll Free: 1-877-776-7585 For industrial control
systems security information and incident reporting: www.ics-cert.org
ICS-CERT continuously strives to improve its products and services. You can
help by answering a short series of questions about this product at the
following URL: https://forms.us-cert.gov/ncsd-feedback/.
a. http://www.invensys.com/, Web site last accessed March 21, 2013.
b. CWE-20 Improper Input Validation,
http://cwe.mitre.org/data/definitions/20.html, Web site last accessed March
21, 2013.
c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-4710, NIST
uses this advisory to create the CVE Web site report. This Web site will be
active sometime after publication of this advisory.
d. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:L/AC:M/Au:N/C:C/I:N/A:C),
Web site last visited March 21, 2013.
e. Invensys software download page,
https://wdn.wonderware.com/sites/WDN/Pages/Downloads/Software.aspx, Web site
last accessed March 21, 2013.
f. CSSP Recommended Practices,
http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html,
Web site last accessed March 21, 2013.
g. Targeted Cyber Intrusion Detection and Mitigation Strategies,
http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01B.pdf, Web site
last accessed March 21, 2013.
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