SSA-448291: Denial-of-Service Vulnerability in ARP Protocol of RWG Universal Controllers
Publication Date:
2021-07-13
Last Update:
2021-07-13
Current Version:
V1.0
CVSS v3.1 Base Score:
6.5
SUMMARY
A Denial-of-Service vulnerability was found affecting the ARP protocol on RWG Universal Controller devices.
Siemens has released updates for the affected products and recommends to update to the latest versions.
AFFECTED PRODUCTS AND SOLUTION
Affected Product and Versions
Remediation
RWG1.M8:
All versions < V1.16.16
Login to the RWG Controller Graphical programming platform, generate a new project file and download the new project file to the device
https://www.ubc.siemens.com.cn/
RWG1.M12:
All versions < V1.16.16
Login to the RWG Controller Graphical programming platform, generate a new project file and download the new project file to the device
https://www.ubc.siemens.com.cn/
RWG1.M12D:
All versions < V1.16.16
Login to the RWG Controller Graphical programming platform, generate a new project file and download the new project file to the device
https://www.ubc.siemens.com.cn/
WORKAROUNDS AND MITIGATIONS
Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:
Ensure that only trusted systems are connected to the same Layer 2 domain as the affected devices
Restrict access to systems in the same Layer 2 domain as the affected devices to trusted persons only
GENERAL SECURITY RECOMMENDATIONS
As a general security measure Siemens strongly recommends to protect network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.
PRODUCT DESCRIPTION
RWG Universal Controllers are used to monitor and control FAU, AHU, heat exchange units, fans, pumps, lighting and other electromechanical equipments.
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-2021-25671
Sending specially crafted ARP packets to an affected device could cause a partial denial-of-service, preventing the device to operate normally. A restart is needed to restore normal operations.
CVSS v3.1 Base Score
6.5
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CWE:
CWE-770: Allocation of Resources Without Limits or Throttling
ADDITIONAL INFORMATION
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
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