10 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.071 Low
EPSS
Percentile
94.0%
David Atch of CyberX has identified a buffer overflow vulnerability in Schneider Electric’s Modicon M340 PLC product line. Schneider Electric has produced a new firmware patch to mitigate this vulnerability.
This vulnerability could be exploited remotely.
Schneider Electric reports that the vulnerability affects the following Modicon M340 PLC products:
Successful exploitation of this vulnerability could cause the device that the attacker is accessing to crash; a buffer overflow condition may allow remote 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.
Schneider Electric is a Europe-based company that maintains offices in 190 countries worldwide.
The affected products, Modicon M340, are PLC devices. According to Schneider Electric, Modicon PLCs are deployed across several sectors including Defense Industrial Base; Energy; 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.
The stack-based buffer overflow vulnerability has been identified, which may allow remote code execution.
CVE-2015-7937NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7937, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, web site last accessed December 17, 2015.
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
Schneider Electric produced a new firmware patch to mitigate this vulnerability.
Schneider Electric recommends this workaround:
Schneider Electric has also published a new firmware publication schedule.
Firmware Release dates:
For more information on this vulnerability and detailed instructions, please see SEVD-2015-344-01 at the following location:
<http://www.schneider-electric.com/ww/en/download/document/SEVD-2015-344-01>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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.
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