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
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
69.8%
CVSS v3 8.6
ATTENTION: Exploitable remotely/low skill level to exploit/public exploits are available
Vendor: Siemens
Equipment: SCALANCE X Switches
**Vulnerability:**Improper Input Validation
Successful exploitation of this vulnerability could allow an attacker with network access to the device to cause a denial-of-service condition.
The following versions of SCALANCE X Switches, which are used to connect industrial components like programmable logic controllers (PLCs) or human machine interfaces (HMIs), are affected:
The web interface on Port 443/TCP could allow an attacker to cause a denial-of-service condition by sending specially crafted packets to the web server. The device will automatically reboot, impacting network availability for other devices.
An attacker must have network access to Port 443/TCP to exploit the vulnerability. Neither valid credentials nor interaction by a legitimate user are required to exploit the vulnerability. There is no confidentiality or integrity impact, availability is only temporarily impacted.
This vulnerability could be exploited by publicly available tools.
CVE-2018-13807 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).
Siemens reported this vulnerability to NCCIC.
Siemens provides updates for SCALANCE X300, and SCALANCE X408, and provides mitigations for the SCALANCE X414.
<https://support.industry.siemens.com/cs/us/en/view/109753720>
<https://support.industry.siemens.com/cs/us/en/view/109753720>
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemensβ operational guidelines for Industrial Security (download: <https://www.siemens.com/cert/operational-guidelines-industrial-security>), and to follow the recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found at:
<https://www.siemens.com/industrialsecurity>.
For more information on this vulnerability and associated software updates, please see Siemens security advisory SSA-447396 on their web site:
<https://www.siemens.com/cert/advisories>.
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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-13807
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cwe.mitre.org/data/definitions/20.html
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support.industry.siemens.com/cs/us/en/view/109753720
support.industry.siemens.com/cs/us/en/view/109753720
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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
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
69.8%