Source: https://www.us-cert.gov/ics/advisories/ICSA-19-085-01
Timestamp: 2020-05-27 04:10:18
Document Index: 95848154

Matched Legal Cases: ['art 1', 'art 1', 'art 2', 'art 2', 'art 3', 'art 3']

Siemens SCALANCE X (Update B) | CISA
Siemens SCALANCE X (Update B)
ICS Advisory (ICSA-19-085-01)
Original release date: January 14, 2020
CVSS v3 5.4
ATTENTION: Exploitable remotely
Equipment: SCALANCE X
Vulnerability: Expected Behavior Violation
2. UPDATE INFORMATION
This updated advisory is a follow-up to the updated advisory titled ICSA-19-085-01 Siemens SCALANCE X (Update A) that was published June 11, 2019, to the ICS webpage on us-cert.gov.
Successful exploitation of this vulnerability could allow an attacker to feed data over a mirror port and into the mirrored network.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following SCALANCE products are affected:
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SCALANCE X-200 switch family (including SIPLUS NET variants): all versions prior to v5.2.4
SCALANCE X-300 switch family (including SIPLUS NET variants): all versions prior to v4.1.3
SCALANCE XP/XC/XF-200 switch family (including SIPLUS NET variants): all versions prior to v4.1
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4.2 VULNERABILITY OVERVIEW
4.2.1 EXPECTED BEHAVIOR VIOLATION CWE-440
The monitor barrier of the affected products insufficiently blocks data from being forwarded over the mirror port and into the mirrored network. An attacker could exploit this vulnerability to transmit malicious packets to systems in the mirrored network to influence their configuration and runtime behavior.
This vulnerability could be exploited by an attacker with network access to the traffic-receiving network. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise the confidentiality and availability of the traffic-generating network.
CVE-2019-6569 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L).
CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, and Water and Wastewater Systems
4.4 RESEARCHER
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Artem Zinenko of Kaspersky identified that SIPLUS is also affected.
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5. MITIGATIONS
Siemens has provided the following specific updates that users can implement to mitigate this vulnerability:
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SCALANCE X-200 switch family (including SIPLUS NET variants): Update to v5.2.4
SCALANCE X-300 switch family (including SIPLUS NET variants): Update to v4.1.3
SCALANCE XP/XC/XF-200 switch family (including SIPLUS NET variants): Update to v4.1
--------- End Update B Part 3 of 3 ----------
Siemens has identified the following specific workarounds/mitigation that users can implement to reduce the risk:
Apply defense in depth principles, particularly ensuring that no devices that transmit data back in the mirroring network are operated within the mirrored network.
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens’ operational guidelines for Industrial Security, and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens is available at: https://www.siemens.com/industrialsecurity
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact Siemens ProductCERT
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-557804
This vulnerability requires high skill level to exploit. No known public exploits specifically target this vulnerability.