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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
72.8%
David Atch of CyberX has identified a stack-based buffer overflow vulnerability in Rockwell Automation’s Allen-Bradley MicroLogix 1100 programmable logic controller (PLC) systems. Rockwell Automation has produced a new firmware version to mitigate this vulnerability.
This vulnerability could be exploited remotely.
The following Allen-Bradley MicroLogix 1100 controller platforms are affected:
Successful exploitation of the stack-based buffer overflow vulnerability may allow an attacker to remotely execute arbitrary code on the affected device.
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.
Rockwell Automation, which is a US-based company, provides industrial automation control and information products worldwide across a wide range of industries.
The affected products, Allen-Bradley MicroLogix 1100, are PLCs. According to Rockwell Automation, these products are deployed across several sectors, including Chemical, Critical Manufacturing, Food and Agriculture, Water and Wastewater Systems, and others. Rockwell Automation estimates that these products are used worldwide.
A stack-based buffer overflow vulnerability exists in a vulnerable function that may allow remote code execution when the device receives a malicious web request.
CVE-2016-0868NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-0868, 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 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H/I:H/A:H, web site last accessed January 26, 2016.
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.
Rockwell Automation has addressed the stack-based buffer overflow vulnerability in the Allen-Bradley MicroLogix 1100 controller, hardware Series B, in firmware Version 15.002. The identified vulnerability is not addressed in the Allen-Bradley MicroLogix 1100 controller, hardware Series A. Rockwell Automation recommends that asset owners using Series A controllers should implement the appropriate mitigations, which are discussed below.
Rockwell Automation’s new firmware version for the MicroLogix 1100 controller, hardware Series B, firmware Version 15.002, is available at the following URL:
<http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=30>
Rockwell Automation’s security notification is available at the following URL, with a valid account:
<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/765050>
Rockwell Automation recommends evaluating the impact of the identified vulnerability within the host environment, and applying the following suggested mitigations, which are applicable.
<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/732398>
<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of the identified 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.
compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=30
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rockwellautomation.custhelp.com/app/answers/detail/a_id/54102
rockwellautomation.custhelp.com/app/answers/detail/a_id/732398
rockwellautomation.custhelp.com/app/answers/detail/a_id/765050
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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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
72.8%