Siemens SIPROTEC and SICAM

As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens' ProductCERT Security Advisories (CERT Services | Services | Siemens Global).

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1. EXECUTIVE SUMMARY

• CVSS v4 9.1
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Siemens
• Equipment: SIPROTEC and SICAM
• Vulnerability: Improper Enforcement of Message Integrity During Transmission in a Communication Channel

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause the network access server to grant the attacker access to the network with the attacker's desired authorization and without the need of knowing or guessing legitimate access credentials.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports the following products using the RADIUS protocol are affected:

• CPC80 Central Processing/Communication: All versions
• CPCI85 Central Processing/Communication: All versions
• POWER METER SICAM Q100 family: All versions prior to V2.70
• POWER METER SICAM Q200 family: All versions
• Powerlink IP: All versions
• SICAM GridPass: All versions prior to V2.50
• SICORE Base system: All versions
• SIPROTEC 5 Compact 7SX800 (CP050): All versions
• SIPROTEC 5 7SA82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SD82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SJ81 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SJ82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SK82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SL82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7UT82 (CP100): Versions V7.80 and after
• SIPROTEC 5 7SA82 (CP150): All versions
• SIPROTEC 5 7SD82 (CP150): All versions
• SIPROTEC 5 7SJ81 (CP150): All versions
• SIPROTEC 5 7SJ82 (CP150): All versions
• SIPROTEC 5 7SK82 (CP150): All versions
• SIPROTEC 5 7SL82 (CP150): All versions
• SIPROTEC 5 7SX82 (CP150): All versions
• SIPROTEC 5 7SY82 (CP150): All versions
• SIPROTEC 5 7UT82 (CP150): All versions
• SIPROTEC 5 6MD84 (CP300): All versions
• SIPROTEC 5 6MD85 (CP300): Versions V7.80 and after
• SIPROTEC 5 6MD86 (CP300): Versions V7.80 and after
• SIPROTEC 5 6MD89 (CP300): Versions V7.80 and after
• SIPROTEC 5 6MD89 (CP300) V9.6: Versions prior to V9.68
• SIPROTEC 5 6MU85 (CP300): All versions
• SIPROTEC 5 7KE85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SA86 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SA87 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SD86 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SD87 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SJ85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SJ86 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SK85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SL86 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SL87 (CP300): Versions V7.80 and after
• SIPROTEC 5 7SS85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7ST85 (CP300): Versions prior to V9.68
• SIPROTEC 5 7ST86 (CP300): Versions prior to V9.83
• SIPROTEC 5 7SX85 (CP300): All versions
• SIPROTEC 5 7UM85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7UT85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7UT86 (CP300): Versions V7.80 and after
• SIPROTEC 5 7UT87 (CP300): Versions V7.80 and after
• SIPROTEC 5 7VE85 (CP300): Versions V7.80 and after
• SIPROTEC 5 7VK87 (CP300): Versions V7.80 and after
• SIPROTEC 5 7VU85 (CP300): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER ENFORCEMENT OF MESSAGE INTEGRITY DURING TRANSMISSION IN A COMMUNICATION CHANNEL CWE-924

The RADIUS Protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify responses Access-Reject or Access-Accept using a chosen-prefix collision attack against MD5 Response Authenticator signature.

CVE-2024-3596 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.0 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-3596. A base score of 9.1 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H).

3.3 BACKGROUND

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

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has released new versions for several of the affected products and recommends updating to the latest versions and configuring the updated systems as follows. Siemens is preparing additional fix versions and recommends specific countermeasures for products where fixes are not yet available.

• POWER METER SICAM Q100 family: Update to V2.70 or a later version.
• SICAM GridPass: Update to V2.50 or a later version.
• SIPROTEC 5 6MD89 (CP300) V9.6, SIPROTEC 5 7ST85 (CP300): Update to V9.68 or a later version.
• SIPROTEC 5 6MD89 (CP300) V9.6, SIPROTEC 5 7ST85 (CP300): Update to V9.68 or a later version.
• SIPROTEC 5 7ST86 (CP300): Update to V9.83 or a later version.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

• Restrict access to the networks where RADIUS messages are exchanged (e.g., send RADIUS traffic via management network or a dedicated VLAN).
• Configure the RADIUS server to require the presence of a Message-Authenticator attribute in all Access-Request packets from RADIUS client devices that support it.

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-794185 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• May 15, 2025: Initial Republication of Siemens SSA-794185

• Siemens