7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
58.5%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Schneider Electric
Equipment: Modicon Modbus Protocol
Vulnerabilities: Authentication Bypass by Capture-Replay, Violation of Secure Design Principles
The following versions of Modicon Modbus protocol, which can be used with the Modicon family of programmable logic controllers (PLCs), are affected:
Successful exploitation of these vulnerabilities may allow an unauthorized remote attacker to capture and replay sensitive commands to PLCs on a network using the Modicon Modbus protocol.
Schneider Electric has reported that they have introduced compensating controls to limit the exploitability of the identified vulnerabilities in many of the PLCs in the Modicon family; however, Schneider Electric recommends that users apply security measures to improve resiliency.
Schneider Electricβs Momentum M1E controllers (all versions of model 171CBU98090 and all versions of model 171CBU98091) do not have built-in compensating controls to limit the exploitability of the identified vulnerabilities and Schneider Electric instructs users to take the following defensive measures:
Schneider Electric reports that Modicon M340, M580, Premium and Quantum users should take one or more of the following defensive measures:
For additional information, Schneider Electric has released a Cybersecurity Notification, which is available at the following location:
<http://www.schneider-electric.com/en/download/document/SEVD-2017-065-01/>
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT 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 web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.
CVE-2017-6034 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
The Modicon Modbus protocol has a session-related weakness making it susceptible to brute-force attacks.
CVE-2017-6032 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Eran Goldstein of CRITIFENCE reported the identified vulnerabilities.
**Critical Infrastructure Sectors:**Critical Manufacturing, Dams, Defense Industrial Base, Energy, Food and Agriculture, Government Facilities, Nuclear Reactors, Materials, and Waste, Transportation Systems, and Water and Wastewater Systems
**Countries/Areas Deployed:**Worldwide
Company Headquarters Location: Paris, France
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-6032
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-6034
www.schneider-electric.com/en/download/document/SEVD-2017-065-01/
cwe.mitre.org/data/definitions/294.html
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7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
58.5%