Summary
SENTRON PAC3200 only provide a 4-digit PIN to protect from administrative access via Modbus TCP interface. Attackers with access to the Modbus TCP interface could easily bypass this protection by brute-force attacks or by monitoring the Modbus cleartext communication.
Siemens recommends specific countermeasures for products where fixes are not, or not yet available.
Vulnerabilities 1
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Critical 9.8
A vulnerability has been identified in SENTRON 7KM PAC3200 (All versions). Affected devices only provide a 4-digit PIN …
Revision history
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#1
Publication date
References
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SSA-850560: Use of 4-Digit PIN in SENTRON PAC3200 Devices - HTML Version
https://cert-portal.siemens.com/productcert/html/ssa-850560.html
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ICS Advisory ICSA-24-284-04 - Web Version
https://www.cisa.gov/news-events/ics-advisories/icsa-24-284-04
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Recommended Practices
https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
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Recommended Practices
https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
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Recommended Practices
https://www.cisa.gov/topics/industrial-control-systems
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Recommended Practices
https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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Recommended Practices
https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
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Recommended Practices
https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B