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AUSCERT External Security Bulletin Redistribution
ESB-2015.2326
Schneider Electric Modicon PLC Vulnerabilities
7 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Modicon PLC products
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6462 CVE-2015-6461
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-246-02
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Advisory (ICSA-15-246-02)
Schneider Electric Modicon PLC Vulnerabilities
Original release date: September 03, 2015
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/.
OVERVIEW
This advisory is a follow-up to the alert titled ICS-ALERT-15-224-02 Schneider
Electric Modicon M340 PLC Station P34 Module Vulnerabilities[a] that was
published August 12, 2015, to the NCCIC/ICS-CERT web site.
Independent researcher Aditya K. Sood reported these vulnerabilities to
ICS-CERT 2 weeks before his public presentation of these vulnerabilities at
DEF CON on August 08, 2015. Schneider Electric was already working on
resolving these vulnerabilities, because they had been reported earlier by
independent researcher Juan Francisco Bolivar. Schneider Electric has released
a firmware patch to mitigate these vulnerabilities.
Exploits that target these vulnerabilities are publicly available.
AFFECTED PRODUCTS
Schneider Electric reports that the vulnerabilities affect the following
Modicon PLC products:
BMXNOC0401,
BMXNOE0100,
BMXNOE0110,
BMXNOE0110H,
BMXNOR0200H,
BMXP342020,
BMXP342020H,
BMXP342030,
BMXP3420302,
BMXP3420302H, and
BMXP342030H.
IMPACT
An attacker exploiting these vulnerabilities can cause the client browser to
redirect to a remote file or execute Java script.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of these vulnerabilities based on their operational environment, architecture,
and product implementation.
BACKGROUND
Schneider Electric is a Europe-based company that maintains offices in 190
countries worldwide.
Their programmable logic controller (PLC) products are used in a wide variety
of automation and control applications across all industrial, infrastructure,
and building sectors. The affected PLC products, Modicon M340, are PLC
devices. According to Schneider Electric, Modicon PLCs are deployed across
several sectors including Dams; Defense Industrial Base; Energy; Food and
Agriculture; Government Facilities; Nuclear Reactors, Materials, and Waste;
Transportation Systems; Water and Wastewater Systems; and others. Schneider
Electric estimates that these products are used primarily in the United
States, China, Russia, and India.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
REMOTE FILE INCLUSION[b]
Remote File Inclusion allows an attacker to craft a specific URL referencing
the PLC web server, which, when launched, will result in the browser
redirecting to a remote file via a Java script loaded with the web page.
CVE-2015-6461[c] has been assigned to this vulnerability. A CVSS v2 base score
of 3.2 has been assigned; the CVSS vector string is
(AV:L/AC:L/Au:S/C:P/I:P/A:N).[d]
REFLECTED CROSS-SITE SCRIPTING[e]
Reflected Cross-Site Scripting (nonpersistent) allows an attacker to craft a
specific URL, which contains Java script that will be executed on the client
browser.
CVE-2015-6462[f] has been assigned to this vulnerability. A CVSS v2 base score
of 3.2 has been assigned; the CVSS vector string is
(AV:L/AC:L/Au:S/C:P/I:P/A:N).[g]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities are not exploitable remotely and cannot be exploited
without user interaction. The exploit is only triggered when a local user
clicks on the specifically crafted web link.
EXISTENCE OF EXPLOIT
Exploits that target these vulnerabilities are publicly available.
DIFFICULTY
Crafting a working exploit for these vulnerabilities would be difficult.
Social engineering is required to convince a person with HTTP access to the
PLC web server to click on the specifically crafted web link. In addition, the
attacker must know the IP address of the target PLC in order to craft the
link. This decreases the likelihood of a successful exploit.
MITIGATION
Schneider Electric released a firmware patch for the listed products to
address these vulnerabilities. It will initially only be available through
Schneider Electrics Customer Support teams and will be included in the next
scheduled product firmware update.
In addition, specific modules and firmware versions allow the HTTP/FTP server
to be disabled through configuration settings, please consult your product
documentation for further information.
For more information on this vulnerability and detailed instructions, please
see SEVD-2015-233-01 at the following location:
http://download.schneider-electric.com/files?p_File_Id=1039693246&p_File_Name=SEVD-2015-233-01.pdf
For other modules and firmware, Schneider Electric has produced a
recommendations document that describes firewall and network architecture
settings that can be used to mitigate these types of vulnerabilities
(Resolution 207869, Mitigation of Vulnerabilities) available at:
http://www.schneider-electric.com/ww/en/download/document/Res207869
To obtain full details on the issues and assistance on how to protect your
installation please contact your local Schneider Electric representative.
ICS-CERT recommends that users take the following measures to protect
themselves from social engineering attacks:
Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams[h] for more information on
avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks[i] for more
information on social engineering attacks.
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 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/).
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.
In addition, ICS-CERT recommends that users take defensive measures to
minimize the risk of exploitation of these vulnerabilities. Specifically,
users should:
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.
a. ICS-CERT ALERT, https://ics-cert.us-cert.gov/alerts/ICS-ALERT-15-224-02,
web site last accessed September 3, 2015.
b. CWE-98: Improper Control of Filename for Include/Require Statement in PHP
Program ('PHP Remote File Inclusion'),
http://cwe.mitre.org/data/definitions/98.html, web site last accessed
September 3, 2015.
c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6461, 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:L/Au:S/C:P/I:P/A:N, web
site last accessed September 3, 2015.
e. CWE-79: Improper Neutralization of Input During Web Page Generation
('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html, web
site last accessed September 3, 2015.
f. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6462, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
g. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:L/Au:S/C:P/I:P/A:N, web
site last accessed September 3, 2015.
h. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed September 3, 2015.
i. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed
September 3, 2015.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
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
product.
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