6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:P/A:P
8.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
8.5 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.1%
CVSS v3 8.2
ATTENTION: Exploitable remotely/low skill level to exploit
**Vendor:**Schneider Electric
**Equipment:**Modicon M221
Vulnerability: Insufficient Verification of Data Authenticity
Successful exploitation of this vulnerability could cause a change of IPv4 configuration (IP address, mask, and gateway) when remotely connected to the device.
Schneider Electric reports that the vulnerability affects the following Modicon products:
Improper implementation of the network configuration module in UMAS protocol, which may allow an attacker to intercept a target PLC’s network traffic by remotely modifying configuration parameters.
CVE-2018-7798 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L).
Eran Goldstein of CRITIFENCE reported this vulnerability to NCCIC.
Schneider Electric recommends the following mitigations to reduce the risk:
Schneider Electric’s security notice SEVD-2018-270-01 is available at the following location:
<https://www.schneider-electric.com/en/download/document/SEVD-2018-270-01/>
Schneider Electric also recommends the following industry cybersecurity practices:
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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-7798
cwe.mitre.org/data/definitions/345.html
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6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:P/A:P
8.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
8.5 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.1%