Summary
Affected products incorrectly validate TCP sequence numbers. This could allow an unauthenticated remote attacker to create a denial of service condition by injecting spoofed TCP RST packets.
Siemens recommends countermeasures for products where fixes are not, or not yet available.
Vulnerabilities 1
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High 7.5
A vulnerability has been identified in SIMATIC CP 343-1 (6GK7343-1EX30-0XE0) (All versions), SIMATIC CP 343-1 Lean (6GK…
Revision history
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#1
Publication Date
References
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SSA-516818: TCP Sequence Number Validation Vulnerability in the TCP/IP Stack of CP343-1 Devices - HTML Version
https://cert-portal.siemens.com/productcert/html/ssa-516818.html
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SSA-516818: TCP Sequence Number Validation Vulnerability in the TCP/IP Stack of CP343-1 Devices - PDF Version
https://cert-portal.siemens.com/productcert/pdf/ssa-516818.pdf
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SSA-516818: TCP Sequence Number Validation Vulnerability in the TCP/IP Stack of CP343-1 Devices - TXT Version
https://cert-portal.siemens.com/productcert/txt/ssa-516818.txt
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ICS Advisory ICSA-24-046-04 - Web Version
https://www.cisa.gov/news-events/ics-advisories/icsa-24-046-04
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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