ESB-2018.1830 - [Appliance] Allen-Bradley CompactLogix and Compact GuardLogix: Denial of service - Remote/unauthenticated 2018-06-22

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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

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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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