SSA-434535: Memory Protection Bypass Vulnerability in SINAMICS PERFECT HARMONY GH180 Drives
Publication Date:
2021-07-13
Last Update:
2021-09-14
Current Version:
V1.1
CVSS v3.1 Base Score:
8.1
SUMMARY
Several models of SINAMICS PERFECT HARMONY GH180 Drives are affected by a memory protection bypass vulnerability in the integrated S7-1500 or S7-1200 CPU that could allow an attacker to write arbitrary data and code to protected memory areas or read sensitive data to launch further attacks on the CPU.
Siemens provides new drives with the fix included and recommends specific countermeasures for older drives. The list of affected drive models can be found in the section “Additional Information”.
AFFECTED PRODUCTS AND SOLUTION
Affected Product and Versions
Remediation
SINAMICS PERFECT HARMONY GH180 Drives:
Drives manufactured before 2021-08-13
Drives manufactured on 2021-08-13 or later are not affected, as they contain a corrected version of the S7-1500 or S7-1200 CPU.
For drives manufactured before 2021-08-13, see the recommendations from section Workarounds and Mitigations.
WORKAROUNDS AND MITIGATIONS
Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:
Avoid compromise of the individually configured access protection password to the S7-1500 or S7-1200 CPU
Ensure that the drive internal network is not externally connected (which is the default configuration in all drives as described in the operational manual)
GENERAL SECURITY RECOMMENDATIONS
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 Siemens’ 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
PRODUCT DESCRIPTION
The SINAMICS PERFECT HARMONY GH180 medium voltage drive family is used to control a wide variety of medium voltage converters or inverters in different applications.
VULNERABILITY CLASSIFICATION
The vulnerability classification has been performed by using the CVSS scoring system in version 3.1
(CVSS v3.1) (https://www.first.org/cvss ). The CVSS environmental score is specific to the customer’s
environment and will impact the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.
An additional classification has been performed using the CWE classification, a community-developed
list of common software security weaknesses. This serves as a common language and as a baseline for
weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found
at: https://cwe.mitre.org/ .
Vulnerability CVE-2020-15782
Affected devices are vulnerable to a memory protection bypass through a specific operation.
A remote unauthenticated attacker with network access to port 102/tcp could potentially write arbitrary data and code to protected memory areas or read sensitive data to launch further attacks.
CVSS v3.1 Base Score
8.1
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CWE:
CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
ADDITIONAL INFORMATION
The following models of SINAMICS PERFECT HARMONY GH180 Drives are affected by CVE-2020-15782:
6SR5 with options A84, A85, E06, W41 with X30 air to air hex
6SR4 with option W41 with X30 air to air hex
For more information regarding CVE-2020-15782 refer to the Siemens Security Advisory SSA-434534 (https://cert-portal.siemens.com/productcert/pdf/ssa-434534.pdf )For further inquiries on security vulnerabilities in Siemens products and solutions, please contact
the Siemens ProductCERT:
https://www.siemens.com/cert/advisories
HISTORY DATA
V1.0 (2021-07-13): Publication Date
V1.1 (2021-09-14): Added solution for affected SINAMICS PERFECT HARMONY GH180 Drives
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