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 5.1
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Siemens
Equipment: SIMATIC S7-1500 and S7-1200 CPUs
Vulnerability: Open Redirect

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to make the web server of affected devices redirect a legitimate user to an attacker-chosen URL.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that the following SIMATIC S7-1500 and S7-1200 CPUs are affected:

SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0): versions prior to V3.1.4
SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0): versions prior to V3.1.4
SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants): all versions
SIMATIC S7-1200 CPU 1211C AC/DC/Rly (6ES7211-1BE40-0XB0): all versions
SIMATIC S7-1200 CPU 1211C DC/DC/DC (6ES7211-1AE40-0XB0): all versions
SIMATIC S7-1200 CPU 1211C DC/DC/Rly (6ES7211-1HE40-0XB0): all versions
SIMATIC S7-1200 CPU 1212C AC/DC/Rly (6ES7212-1BE40-0XB0): all versions
SIMATIC S7-1200 CPU 1212C DC/DC/DC (6ES7212-1AE40-0XB0): all versions
SIMATIC S7-1200 CPU 1212C DC/DC/Rly (6ES7212-1HE40-0XB0): all versions
SIMATIC S7-1200 CPU 1212FC DC/DC/DC (6ES7212-1AF40-0XB0): all versions
SIMATIC S7-1200 CPU 1212FC DC/DC/Rly (6ES7212-1HF40-0XB0): all versions
SIMATIC S7-1200 CPU 1214C AC/DC/Rly (6ES7214-1BG40-0XB0): all versions
SIMATIC S7-1200 CPU 1214C DC/DC/DC (6ES7214-1AG40-0XB0): all versions
SIMATIC S7-1200 CPU 1214C DC/DC/Rly (6ES7214-1HG40-0XB0): all versions
SIMATIC S7-1200 CPU 1214FC DC/DC/DC (6ES7214-1AF40-0XB0): all versions
SIMATIC S7-1200 CPU 1214FC DC/DC/Rly (6ES7214-1HF40-0XB0): all versions
SIMATIC S7-1200 CPU 1215C AC/DC/Rly (6ES7215-1BG40-0XB0): all versions
SIMATIC S7-1200 CPU 1215C DC/DC/DC (6ES7215-1AG40-0XB0): all versions
SIMATIC S7-1200 CPU 1215C DC/DC/Rly (6ES7215-1HG40-0XB0): all versions
SIMATIC S7-1200 CPU 1215FC DC/DC/DC (6ES7215-1AF40-0XB0): all versions
SIMATIC S7-1200 CPU 1215FC DC/DC/Rly (6ES7215-1HF40-0XB0): all versions
SIMATIC S7-1200 CPU 1217C DC/DC/DC (6ES7217-1AG40-0XB0): all versions
SIMATIC S7-1500 CPU 1510SP F-1 PN (6ES7510-1SJ01-0AB0): all versions
SIMATIC S7-1500 CPU 1510SP F-1 PN (6ES7510-1SK03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1510SP-1 PN (6ES7510-1DJ01-0AB0): all versions
SIMATIC S7-1500 CPU 1510SP-1 PN (6ES7510-1DK03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK01-0AB0): all versions
SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK02-0AB0): all versions
SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AL03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK00-0AB0): all versions
SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK01-0AB0): all versions
SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CL03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FK01-0AB0): all versions
SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FK02-0AB0): all versions
SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FL03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1511T-1 PN (6ES7511-1TK01-0AB0): all versions
SIMATIC S7-1500 CPU 1511T-1 PN (6ES7511-1TL03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1511TF-1 PN (6ES7511-1UK01-0AB0): all versions
SIMATIC S7-1500 CPU 1511TF-1 PN (6ES7511-1UL03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CK00-0AB0): all versions
SIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CK01-0AB0): all versions
SIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1512SP F-1 PN (6ES7512-1SK01-0AB0): all versions
SIMATIC S7-1500 CPU 1512SP F-1 PN (6ES7512-1SM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1512SP-1 PN (6ES7512-1DK01-0AB0): all versions
SIMATIC S7-1500 CPU 1512SP-1 PN (6ES7512-1DM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1513-1 PN (6ES7513-1AL01-0AB0): all versions
SIMATIC S7-1500 CPU 1513-1 PN (6ES7513-1AL02-0AB0): all versions
SIMATIC S7-1500 CPU 1513-1 PN (6ES7513-1AM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1513F-1 PN (6ES7513-1FL01-0AB0): all versions
SIMATIC S7-1500 CPU 1513F-1 PN (6ES7513-1FL02-0AB0): all versions
SIMATIC S7-1500 CPU 1513F-1 PN (6ES7513-1FM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1513pro F-2 PN (6ES7513-2GM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1513pro-2 PN (6ES7513-2PM03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1514SP F-2 PN (6ES7514-2SN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1514SP-2 PN (6ES7514-2DN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1514SPT F-2 PN (6ES7514-2WN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1514SPT-2 PN (6ES7514-2VN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AM01-0AB0): all versions
SIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AM02-0AB0): all versions
SIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1515F-2 PN (6ES7515-2FM01-0AB0): all versions
SIMATIC S7-1500 CPU 1515F-2 PN (6ES7515-2FM02-0AB0): all versions
SIMATIC S7-1500 CPU 1515F-2 PN (6ES7515-2FN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1515T-2 PN (6ES7515-2TM01-0AB0): all versions
SIMATIC S7-1500 CPU 1515T-2 PN (6ES7515-2TN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1515TF-2 PN (6ES7515-2UM01-0AB0): all versions
SIMATIC S7-1500 CPU 1515TF-2 PN (6ES7515-2UN03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516-3 PN/DP (6ES7516-3AN01-0AB0): all versions
SIMATIC S7-1500 CPU 1516-3 PN/DP (6ES7516-3AN02-0AB0): all versions
SIMATIC S7-1500 CPU 1516-3 PN/DP (6ES7516-3AP03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516F-3 PN/DP (6ES7516-3FN01-0AB0): all versions
SIMATIC S7-1500 CPU 1516F-3 PN/DP (6ES7516-3FN02-0AB0): all versions
SIMATIC S7-1500 CPU 1516F-3 PN/DP (6ES7516-3FP03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516pro F-2 PN (6ES7516-2GP03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516pro-2 PN (6ES7516-2PP03-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516T-3 PN/DP (6ES7516-3TN00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1516TF-3 PN/DP (6ES7516-3UN00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1517-3 PN/DP (6ES7517-3AP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1517F-3 PN/DP (6ES7517-3FP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1517F-3 PN/DP (6ES7517-3FP01-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1517T-3 PN/DP (6ES7517-3TP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1517TF-3 PN/DP (6ES7517-3UP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1518-4 PN/DP (6ES7518-4AP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): all versions
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): all versions
SIMATIC S7-1500 CPU 1518F-4 PN/DP (6ES7518-4FP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): all versions
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): all versions
SIMATIC S7-1500 CPU 1518T-4 PN/DP (6ES7518-4TP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU 1518TF-4 PN/DP (6ES7518-4UP00-0AB0): versions prior to V3.1.4
SIMATIC S7-1500 CPU S7-1518-4 PN/DP ODK (6ES7518-4AP00-3AB0): all versions
SIMATIC S7-1500 CPU S7-1518F-4 PN/DP ODK (6ES7518-4FP00-3AB0): all versions
SIMATIC S7-1500 ET 200pro: CPU 1513PRO F-2 PN (6ES7513-2GL00-0AB0): all versions
SIMATIC S7-1500 ET 200pro: CPU 1513PRO-2 PN (6ES7513-2PL00-0AB0): all versions
SIMATIC S7-1500 ET 200pro: CPU 1516PRO F-2 PN (6ES7516-2GN00-0AB0): all versions
SIMATIC S7-1500 ET 200pro: CPU 1516PRO-2 PN (6ES7516-2PN00-0AB0): all versions
SIMATIC S7-1500 Software Controller CPU 1507S F V2: all versions
SIMATIC S7-1500 Software Controller CPU 1507S F V3: all versions
SIMATIC S7-1500 Software Controller CPU 1507S V2: all versions
SIMATIC S7-1500 Software Controller CPU 1507S V3: all versions
SIMATIC S7-1500 Software Controller CPU 1508S F V2: all versions
SIMATIC S7-1500 Software Controller CPU 1508S F V3: all versions
SIMATIC S7-1500 Software Controller CPU 1508S T V3: all versions
SIMATIC S7-1500 Software Controller CPU 1508S TF V3: all versions
SIMATIC S7-1500 Software Controller CPU 1508S V2: all versions
SIMATIC S7-1500 Software Controller CPU 1508S V3: all versions
SIMATIC S7-1500 Software Controller Linux V2: all versions
SIMATIC S7-1500 Software Controller Linux V3: all versions
SIMATIC S7-PLCSIM Advanced: all versions
SIPLUS ET 200SP CPU 1510SP F-1 PN (6AG1510-1SJ01-2AB0): all versions
SIPLUS ET 200SP CPU 1510SP F-1 PN RAIL (6AG2510-1SJ01-1AB0): all versions
SIPLUS ET 200SP CPU 1510SP-1 PN (6AG1510-1DJ01-2AB0): all versions
SIPLUS ET 200SP CPU 1510SP-1 PN (6AG1510-1DJ01-7AB0): all versions
SIPLUS ET 200SP CPU 1510SP-1 PN RAIL (6AG2510-1DJ01-1AB0): all versions
SIPLUS ET 200SP CPU 1510SP-1 PN RAIL (6AG2510-1DJ01-4AB0): all versions
SIPLUS ET 200SP CPU 1512SP F-1 PN (6AG1512-1SK01-2AB0): all versions
SIPLUS ET 200SP CPU 1512SP F-1 PN (6AG1512-1SK01-7AB0): all versions
SIPLUS ET 200SP CPU 1512SP F-1 PN RAIL (6AG2512-1SK01-1AB0): all versions
SIPLUS ET 200SP CPU 1512SP F-1 PN RAIL (6AG2512-1SK01-4AB0): all versions
SIPLUS ET 200SP CPU 1512SP-1 PN (6AG1512-1DK01-2AB0): all versions
SIPLUS ET 200SP CPU 1512SP-1 PN (6AG1512-1DK01-7AB0): all versions
SIPLUS ET 200SP CPU 1512SP-1 PN RAIL (6AG2512-1DK01-1AB0): all versions
SIPLUS ET 200SP CPU 1512SP-1 PN RAIL (6AG2512-1DK01-4AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN (6AG1511-1AK01-2AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN (6AG1511-1AK01-7AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN (6AG1511-1AK02-2AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN (6AG1511-1AK02-7AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN T1 RAIL (6AG2511-1AK01-1AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN T1 RAIL (6AG2511-1AK02-1AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN TX RAIL (6AG2511-1AK01-4AB0): all versions
SIPLUS S7-1500 CPU 1511-1 PN TX RAIL (6AG2511-1AK02-4AB0): all versions
SIPLUS S7-1500 CPU 1511F-1 PN (6AG1511-1FK01-2AB0): all versions
SIPLUS S7-1500 CPU 1511F-1 PN (6AG1511-1FK02-2AB0): all versions
SIPLUS S7-1500 CPU 1513-1 PN (6AG1513-1AL01-2AB0): all versions
SIPLUS S7-1500 CPU 1513-1 PN (6AG1513-1AL01-7AB0): all versions
SIPLUS S7-1500 CPU 1513-1 PN (6AG1513-1AL02-2AB0): all versions
SIPLUS S7-1500 CPU 1513-1 PN (6AG1513-1AL02-7AB0): all versions
SIPLUS S7-1500 CPU 1513F-1 PN (6AG1513-1FL01-2AB0): all versions
SIPLUS S7-1500 CPU 1513F-1 PN (6AG1513-1FL02-2AB0): all versions
SIPLUS S7-1500 CPU 1515F-2 PN (6AG1515-2FM01-2AB0): all versions
SIPLUS S7-1500 CPU 1515F-2 PN (6AG1515-2FM02-2AB0): all versions
SIPLUS S7-1500 CPU 1515F-2 PN RAIL (6AG2515-2FM02-4AB0): all versions
SIPLUS S7-1500 CPU 1515F-2 PN T2 RAIL (6AG2515-2FM01-2AB0): all versions
SIPLUS S7-1500 CPU 1515R-2 PN TX RAIL (6AG2515-2RM00-4AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP (6AG1516-3AN01-2AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP (6AG1516-3AN01-7AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP (6AG1516-3AN02-2AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP (6AG1516-3AN02-7AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP RAIL (6AG2516-3AN02-4AB0): all versions
SIPLUS S7-1500 CPU 1516-3 PN/DP TX RAIL (6AG2516-3AN01-4AB0): all versions
SIPLUS S7-1500 CPU 1516F-3 PN/DP (6AG1516-3FN01-2AB0): all versions
SIPLUS S7-1500 CPU 1516F-3 PN/DP (6AG1516-3FN02-2AB0): all versions
SIPLUS S7-1500 CPU 1516F-3 PN/DP RAIL (6AG2516-3FN02-2AB0): all versions
SIPLUS S7-1500 CPU 1516F-3 PN/DP RAIL (6AG2516-3FN02-4AB0): all versions
SIPLUS S7-1500 CPU 1518-4 PN/DP (6AG1518-4AP00-4AB0): versions prior to V3.1.4
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): all versions
SIPLUS S7-1500 CPU 1518F-4 PN/DP (6AG1518-4FP00-4AB0): versions prior to V3.1.4

3.2 Vulnerability Overview

3.2.1 URL REDIRECTION TO UNTRUSTED SITE (‘OPEN REDIRECT’) CWE-601

The web server of affected devices does not properly validate input that is used for a user redirection. This could allow an attacker to make the server redirect the legitimate user to an attacker-chosen URL. For a successful exploit, the legitimate user must actively click on an attacker-crafted link.

CVE-2024-46886 has been assigned to this vulnerability. A CVSS v3 base score of 4.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N).

A CVSS v4 score has also been calculated forCVE-2024-46886. A base score of 5.1 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N).

3.3 BACKGROUND

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

3.4 RESEARCHER

David Henrique Estevam de Andrade reported this vulnerability to Siemens.

4. MITIGATIONS

Siemens has released new versions for several affected products and recommends users update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available:

SIMATIC Drive Controller CPU: Update to V3.1.4 or later version

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

All affected products: Do not click on links from unknown sources.

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-876787 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.

5. UPDATE HISTORY

October 10, 2024: Initial Publication