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AUSCERT External Security Bulletin Redistribution
ESB-2018.1830
Advisory (ICSA-18-172-02) Rockwell Automation Allen-Bradley
CompactLogix and Compact GuardLogix
22 June 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Allen-Bradley CompactLogix
Allen-Bradley Compact GuardLogix
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-9312
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-172-02
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Advisory (ICSA-18-172-02) Rockwell Automation Allen-Bradley CompactLogix and
Compact GuardLogix
Original release date: June 21, 2018
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/.
1. EXECUTIVE SUMMARY
CVSS v3 8.6
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Rockwell Automation
Equipment: Allen-Bradley CompactLogix and Compact GuardLogix
Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could result in a
denial-of-service condition. As a result, the controller goes into a Major
Non-Recoverable Fault (MNRF) state, which is considered safe. However,
recovery requires the user to download the application program again.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
According to Rockwell Automation, the following products are affected:
Allen-Bradley CompactLogix 5370 L1 controllers, Versions 30.012 and prior,
Allen-Bradley CompactLogix 5370 L2 controllers, Versions 30.012 and prior,
Allen-Bradley CompactLogix 5370 L3 controllers, Versions 30.012 and prior,
Allen-Bradley Armor CompactLogix 5370 L3 controllers, Versions 30.012 and
prior,
Allen-Bradley Compact GuardLogix 5370 controllers, Versions 30.012 and
prior, and
Allen-Bradley Armor Compact GuardLogix 5370 controllers, Versions 30.012
and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
This vulnerability may allow an attacker to intentionally send a specific TCP
packet to the product and cause a Major Non-Recoverable Fault (MNRF),
resulting in a denial-of-service condition.
CVE-2017-9312 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.3 BACKGROUND
CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Food
and Agriculture, Transportation Systems, Water and Wastewater Systems
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Milwaukee, Wisconsin
3.4 RESEARCHER
Alexey Perepechko of Applied Risk reported this vulnerability to Rockwell
Automation. Rockwell Automation determined there were additional products
affected by the vulnerability and reported this information to NCCIC.
4. MITIGATIONS
Rockwell Automation recommends users with affected controllers apply firmware
revision FRN (31.011 or later) to the affected products. The download can be
obtained at the following location:
https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?crumb=112
Users who are unable to update are directed to employ the following general
security guidelines:
o Block all traffic to Ethernet/IP or other CIP protocol-based devices from
outside the Manufacturing Zone by blocking or restricting access to Port
2222/TCP and UDP and Port 44818/TCP and UDP using proper network
infrastructure controls, such as firewalls, UTM devices, or other security
appliances. For more information on TCP/UDP ports used by Rockwell Automation
Products, see Knowledgebase Article ID 898270 available at:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/898270/page/1
(login required).
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet.
o 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.
When possible, users are recommended to apply the firmware revision in
conjunction with the general security guidelines to employ multiple strategies
simultaneously.
For more information on this vulnerability and more detailed mitigation
instructions, please access an account in order to view Rockwell Automations
advisory at the following location:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073708 (login
required).
NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o 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.
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-12-146-01B--Targeted 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.
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