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AUSCERT External Security Bulletin Redistribution
ESB-2018.1041
Advisory (ICSA-18-095-01) Rockwell Automation MicroLogix
6 April 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rockwell Automation MicroLogix
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-12093 CVE-2017-12092 CVE-2017-12090
CVE-2017-12089 CVE-2017-12088
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-095-01
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Advisory (ICSA-18-095-01) Rockwell Automation MicroLogix
Original release date: April 05, 2018
Legal Notice
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1. EXECUTIVE SUMMARY
CVSS v3 10.0
ATTENTION: Exploitable remotely/low skill level to exploit.
Vendor: Rockwell
Equipment: MicroLogix Controller
Vulnerabilities: Improper Authentication
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause denial of
service, disclosure of sensitive information, communication loss, and
modification of settings or ladder logic.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of MicroLogix Controllers, a PLC (Programmable Logic
Controller), are affected:
MicroLogix 1400 Versions FRN 21.003 and prior, and
MicroLogix 1100 Versions FRN 16.00 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER AUTHENTICATION CWE-287
A remote, unauthenticated attacker could send a specially crafted packet to
the Ethernet port of an affected controller, which puts the device in a fault
state, and could result in the deletion of ladder logic.
CVE-2017-12088 has been assigned to this vulnerability. A CVSS v3 base score
of 8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.2 IMPROPER AUTHENTICATION CWE-287
A remote, unauthenticated attacker could send a specially crafted packet that
does not indicate the download is complete to the controller during the
standard download process, causing the controller to freeze for one minute
before entering a fault state.
CVE-2017-12089 has been assigned to this vulnerability. A CVSS v3 base score
of 6.8 has been calculated; the CVSS vector string is
(AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
3.2.3 IMPROPER AUTHENTICATION CWE-287
A specially crafted SNMP-set request, when sent without associated SNMP-set
commands for firmware flashing, can cause the device to power cycle, resulting
in downtime for the device.
CVE-2017-12090 has been assigned to this vulnerability. A CVSS v3 base score
of 6.3 has been calculated; the CVSS vector string is
(AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H).
3.2.4 IMPROPER AUTHENTICATION CWE-287
A remote, unauthenticated attacker could send a specially crafted packet to
the affected device and utilize read or write operations. This could result in
several potential impacts, ranging from disclosure of sensitive information,
modification of settings, or ladder logic modification.
See the Rockwell customer notification for the table with specific CVEs. 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).
3.2.5 IMPROPER AUTHENTICATION CWE-287
A memory module, which is a backup, installed in a MicroLogix controller
allows a user to instruct the controller to write to its program to the module
without authentication.
CVE-2017-12092 has been assigned to this vulnerability. A CVSS v3 base score
of 3.7 has been calculated; the CVSS vector string is
(AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).
3.2.6 IMPROPER AUTHENTICATION CWE-287
The MicroLogix 1400 controller supports 10 active sessions at a time. An
attacker could send their own registered session packets; and once the 11th
packet is sent, the first packet will be dropped and the user session will be
lost.
CVE-2017-12093 has been assigned to this vulnerability. A CVSS v3 base score
of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
3.3 BACKGROUND
o Critical Infrastructure Sectors: Critical Manufacturing, Food and
Agriculture, and Water and Wastewater Systems.
o Countries/Areas Deployed: Worldwide
o Company Headquarters Location: Wisconsin
3.3 RESEARCHER
Jared Rittle and Patrick DeSantis of Cisco reported these vulnerabilities to
Rockwell, and Rockwell reported the vulnerabilities to NCCIC.
4. MITIGATIONS
Rockwell Automation has recommended that users employ the following mitigation
strategies where applicable:
o Users using affected versions of MicroLogix 1100 and MicroLogix 1400
Series A are urged to contact their local distributor or Sales Office in
order to upgrade their devices to a newer product line.
o Set keyswitch to Hard Run to block any unauthorized changes
o For MicroLogix 1400 Series only, Apply FRN 21.002 or later
Rockwell Automation has provided more specific mitigations that can be found
in their customer notification (KB1072942) located at:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1072942# (link
is external) (login required)
NCCIC recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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.
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