CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
Percentile
45.3%
Successful exploitation of these vulnerabilities could cause denial of service, disclosure of sensitive information, communication loss, and modification of settings or ladder logic.
The following versions of MicroLogix Controllers, a PLC (Programmable Logic Controller), are affected:
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).
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).
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).
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).
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).
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).
Jared Rittle and Patrick DeSantis of Cisco reported these vulnerabilities to Rockwell, and Rockwell reported the vulnerabilities to NCCIC.
Rockwell Automation has recommended that users employ the following mitigation strategies where applicable:
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# (login required)
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 in the ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12088
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12089
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12090
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12092
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12093
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
Percentile
45.3%