6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.9 Medium
AI Score
Confidence
Low
0.002 Low
EPSS
Percentile
55.2%
CVSS v3 7.0
Vendor: Omron
**Equipment:**CX-Supervisor
Vulnerabilities: Improper Restriction of Operations within the Bounds of a Memory Buffer, Out-Of-Bounds Read, Use-After-Free, Incorrect Type Conversion or Cast
This updated advisory is a follow-up to the original advisory titled ICSA-18-290-01 Omron CX-Supervisor that was published October 17, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of these vulnerabilities could allow an attacker to execute code under the context of the application, corrupt objects, and force the application to read a value outside of an array.
The following versions of CX-Supervisor are affected:
4.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119
When processing project files and tampering with a specific byte, memory corruption may occur within a specific object.
CVE-2018-17905 has been assigned to this vulnerability. A CVSS v3 base score of 4.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L).
4.2.2 OUT-OF-BOUNDS READ CWE-125
When processing project files and tampering with the value of an offset, an attacker can force the application to read a value outside of an array.
CVE-2018-17907 has been assigned to this vulnerability. A CVSS v3 base score of 2.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
4.2.3 USE AFTER FREE CWE-416
When processing project files the application fails to check if it is referencing freed memory, which may allow an attacker to execute code in under the context of the application.
CVE-2018-17909 has been assigned to this vulnerability. A CVSS v3 base score of 4.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L).
4.2.4 INCORRECT TYPE VERSION OR CAST CWE-704
A type confusion vulnerability exists when processing project files, which may allow an attacker to execute code in the context of the application.
CVE-2018-17913 has been assigned to this vulnerability. A CVSS v3 base score of 7.0 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
--------- Begin Update A Part 1 of 1 --------
Mat Powell of Trend Microβs Zero Day Initiative, Esteban Ruiz (mr_me) of Source Incite, Ariele Caltabiano (kimiya) of 9SG Security Team, and b0nd @garage4hackers working with Trend Microβs Zero Day Initiative reported these vulnerabilities to NCCIC.
--------- End Update A Part 1 of 1 ----------
Omron has released Version 3.4.2 of CX-Supervisor to address the reported vulnerabilities. Users can download the latest version of CX-Supervisor at the following location:
https://www.myomron.com/index.php?action=kb&article=1709
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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 these vulnerabilities. These vulnerabilities are not exploitable remotely. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-17905
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-17907
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-17909
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-17913
cwe.mitre.org/data/definitions/119.html
cwe.mitre.org/data/definitions/125.html
cwe.mitre.org/data/definitions/416.html
cwe.mitre.org/data/definitions/704.html
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6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.9 Medium
AI Score
Confidence
Low
0.002 Low
EPSS
Percentile
55.2%