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AUSCERT External Security Bulletin Redistribution
ESB-2016.2571
Schneider Electric ConneXium Buffer Overflow Vulnerability
2 November 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric ConneXium
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-8352
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-306-01
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Advisory (ICSA-16-306-01)
Schneider Electric ConneXium Buffer Overflow Vulnerability
Original release date: November 01, 2016
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
Independent researcher Nir Giller has identified a buffer overflow
vulnerability in Schneider Electrics ConneXium firewall product. Schneider
Electric is developing a firmware update to mitigate this vulnerability.
This vulnerability is remotely exploitable.
AFFECTED PRODUCTS
The following ConneXium firewalls are affected:
TCSEFEC23F3F20 all versions,
TCSEFEC23F3F21 all versions,
TCSEFEC23FCF20 all versions,
TCSEFEC23FCF21 all versions, and
TCSEFEC2CF3F20 all versions.
IMPACT
An exploit of this vulnerability could result in a buffer overflow that could
allow an attacker to execute code during the SNMP (Simple Network Management
Protocol) login authentication process.
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 Electrics corporate headquarters is located in Paris, France, and
maintains offices in more than 100 countries worldwide.
The affected products, ConneXium firewalls, are network firewalls. According
to Schneider Electric, ConneXium firewalls are deployed across several sectors
including Commercial Facilities Sector and others. Schneider Electric
estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
STACK-BASED BUFFER OVERFLOW[a]
A buffer overflow can be triggered during the SNMP login authentication
process that may allow an attacker to remotely execute code.
CVE-2016-8352[b] has been assigned to this vulnerability. A CVSS v3 base score
of 10.0 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).[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 a low skill would be able to exploit this vulnerability.
MITIGATION
Schneider Electric is in the process of updating ConneXium firewall products
to resolve this vulnerability through a firmware update. The updated firmware
will be available on the Schneider Electric web site for download.
Schneider Electric recommends users contact their local Schneider
representative for additional information.
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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.
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. 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.
a. CWE-121: Stack-based Buffer Overflow,
https://cwe.mitre.org/data/definitions/121.html, web site last accessed
November 01, 2016.
b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8352, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed November 01, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov (link sends e-mail)
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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