7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
73.0%
CVSS v3 7.5
ATTENTION: Remotely exploitable/low-skill level to exploit
Vendor: Schneider Electric
Equipment: Modicon M340 PLC
Vulnerability: Resource Exhaustion
This updated advisory is a follow-up to the original advisory titled ICSA-17-054-03 Schneider Electric Modicon M340 PLC that was published February 23, 2017, on the NCCIC/ICS-CERT website.
Successful exploitation of this vulnerability may render the device unresponsive requiring a physical reset of the PLC.
--------- Begin Update A Part 1 of 3 --------
Schneider Electric reports the vulnerability affects the following products:
--------- End Update A Part 1 of 3 --------
A stack-based buffer overflow vulnerability has been identified, which may allow remote code execution.
CVE-2017-6017 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).
--------- Begin Update A Part 2 of 3 --------
Jos Wetzel of Midnight Blue, Younes Dragoni of Nozomi Networks, Ezequiel Fernandez and Luis Francisco Martin Liras of SUPPRESS group at the University of LΓ©on, as well as Zhang Xiaoming, Zhang Jiawei, Sun Zhonghao and Luo Bing from CNCERT/CC reported the issue to Schneider Electric.
--------- End Update A Part 2 of 3 --------
--------- Begin Update A Part 3 of 3 --------
Schneider Electric has released fixes for the vulnerability that can be downloaded from:
Schneider Electric recommends the following workarounds and mitigations for Premium and M1E devices:
For more information Schneider Electric has released a security notification that can be found at: <https://www.schneider-electric.com/en/download/document/SEVD-2017-048-02/>
--------- End Update A Part 3 of 3 --------
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC 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 on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-6017
cwe.mitre.org/data/definitions/400.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Schneider%20Electric%20Modicon%20M340%20PLC%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-17-054-03
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-17-054-03&title=Schneider%20Electric%20Modicon%20M340%20PLC%20%28Update%20A%29
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
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-17-054-03
www.oig.dhs.gov/
www.schneider-electric.com/en/download/document/OFS_3_50_2905/
www.schneider-electric.com/en/download/document/SEVD-2017-048-02/
www.schneider-electric.fr/fr/search/V2.9?filters=CAT_PRD_DOC_FIRMUPD
www.schneider-electric.us/en/product-range/62098-modicon-m580-paccontroller/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-17-054-03
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Schneider%20Electric%20Modicon%20M340%20PLC%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-17-054-03
7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
73.0%