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             AUSCERT External Security Bulletin Redistribution

              Schneider Electric Modicon PLC Vulnerabilities
                             7 September 2015


        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: 

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Advisory (ICSA-15-246-02)

Schneider Electric Modicon PLC Vulnerabilities

Original release date: September 03, 2015

Legal Notice

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more information about TLP, see http://www.us-cert.gov/tlp/.


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.


Schneider Electric reports that the vulnerabilities affect the following 
Modicon PLC products:










BMXP3420302H, and



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.


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.




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 


Reflected Cross-Site Scripting (nonpersistent) allows an attacker to craft a 
specific URL, which contains Java script that will be executed on the client 

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 



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.


Exploits that target these vulnerabilities are publicly available.


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.


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:


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:


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 

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: 

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 

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