Siemens SENTRON Powercenter 1000 (Update A)

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 7.1
• ATTENTION: Low attack complexity
• Vendor: Siemens
• Equipment: SENTRON Powercenter 1000 (Not affected)
• Vulnerability: Incorrect Synchronization

2. RISK EVALUATION

This vulnerability is not exploitable on the listed devices due to the absence of the relevant components.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that the following products are NOT affected:

• SENTRON Powercenter 1000 (7KN1110-0MC00): All versions
• SENTRON Powercenter 1100 (7KN1111-0MC00): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 INCORRECT SYNCHRONIZATION CWE-821

A denial of service condition can only be triggered during BLE pairing. This occurs only in a limited time window of three minutes after any device restart, which requires physical access. A reset of the power supply is necessary to recover the device.

CVE-2024-6657 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2024-6657. A base score of 7.1 has been calculated; the CVSS vector string is (CVSS4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens reports that SENTRON Powercenter devices are not affected by a denial of service vulnerability that can be triggered during BLE (Bluetooth Low Energy) pairing.

Note: Unlike stated in the initial version of this security advisory, detailed analysis has shown that SENTRON Powercenter devices are not affected by this vulnerability.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-620799 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability is not exploitable remotely.

5. UPDATE HISTORY

• December 12, 2024: Initial Publication
• June 17, 2024: Update A - Updated risk evaluation, affected products, and mitigations to clarify that no vulnerabilities are present, contrary to the initial reporting. Updated CVSS vector string and score to match CVE record as the vulnerability is no longer being evaluated for this specific Siemens product.

• Siemens