CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
51.6%
CVSS v3 10.0
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Rockwell Automation
**Equipment:**Logix5000
**Vulnerability:**Stack-based Buffer Overflow
This updated advisory is a follow-up to the previously updated advisory titled ICSA-16-343-05A Rockwell Automation Logix5000 Programmable Automation Controller Buffer Overflow Vulnerability (Update A) that was published February 14, 2017, on the NCCIC/ICS-CERT website.
Successful exploitation of this vulnerability may allow a remote attacker to cause a denial of service at a controller or execute code on a target controller.
The following firmware versions for the Logix5000 Controller product line are affected, excluding all firmware versions prior to Version 16.00, which are not affected:
4.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
By sending malformed common industrial protocol (CIP) packet, an attacker may be able to overflow a buffer and execute code on the controller or initiate a non-recoverable fault resulting in a denial of service.
CVE-2016-9343 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).
Rockwell Automation reported this vulnerability to NCCIC.
--------- Begin Update B Part 1 of 1 --------
Rockwell Automation has released new firmware versions to mitigate the identified vulnerability in the affected Logix5000 Controllers, with the exception of the FlexLogix controller, which has been discontinued and is no longer supported.
Rockwell Automation encourages users to install the new firmware version listed below (Catalog Numbers, βCNβ, in parenthesis):
For more information about these catalog numbers, see Page 10 of the PowerFlex 700S Drives with Phase II Control Technical Data document.
--------- End Update B Part 1 of 1 --------
Rockwell Automationβs new firmware versions are available at the following URL:
http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx
Rockwell Automationβs security notification is available at the following URL, with a valid account:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/970074
Rockwell Automation recommends that users apply additional precautions and risk mitigation strategies to this type of attack, when possible, which could include the following:
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.
No known public exploits specifically target this vulnerability.
compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx
literature.rockwellautomation.com/idc/groups/literature/documents/td/20d-td002_-en-p.pdf
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9343
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-16-343-05
cwe.mitre.org/data/definitions/121.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
rockwellautomation.custhelp.com/app/answers/detail/a_id/970074
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
51.6%