ICSA-20-343-05
Vulnerability from csaf_cisa
Published
2020-12-08 00:00
Modified
2025-05-06 06:00
Summary
Siemens Embedded TCP/IP Stack Vulnerabilities-AMNESIA:33 (Update C)

Notes

Summary
Security researchers discovered and disclosed 33 vulnerabilities in several open-source TCP/IP stacks for embedded devices, also known as "AMNESIA:33" vulnerabilities. This advisory describes the impact of one of these vulnerabilities (CVE-2020-13988) to Siemens products. Siemens has released updates for the affected products and recommends to update to the latest versions. The impact of additional "AMNESIA:33" vulnerabilities is described in Siemens Security Advisory SSA-541018.
General Recommendations
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
Advisory Conversion Disclaimer
This CISA CSAF advisory was converted from Siemens ProductCERT's CSAF advisory.
Critical infrastructure sectors
Multiple
Countries/areas deployed
Worldwide
Company headquarters location
Germany
Recommended Practices
CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.
Recommended Practices
Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.
Recommended Practices
Locate control system networks and remote devices behind firewalls and isolate them from business networks.
Recommended Practices
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices.
Recommended Practices
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices
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.
Recommended Practices
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.
Recommended Practices
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.


To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "organization": "Siemens ProductCERT",
        "summary": "reporting these vulnerabilities to CISA."
      },
      {
        "names": [
          "Jos Wetzels",
          "Stanislav Dashevskyi",
          "Amine Amri",
          "Daniel dos Santos"
        ],
        "organization": "Forescout Technologies",
        "summary": "coordinated disclosure"
      },
      {
        "organization": "Cybersecurity and Infrastructure Security Agency (CISA)",
        "summary": "coordination efforts"
      },
      {
        "organization": "CERT Coordination Center (CERT/CC)",
        "summary": "coordination efforts"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "Security researchers discovered and disclosed 33 vulnerabilities in several open-source TCP/IP stacks for embedded devices, also known as \"AMNESIA:33\" vulnerabilities.\n\nThis advisory describes the impact of one of these vulnerabilities (CVE-2020-13988) to Siemens products. Siemens has released updates for the affected products and recommends to update to the latest versions.\n\nThe impact of additional \"AMNESIA:33\" vulnerabilities is described in Siemens Security Advisory SSA-541018.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\n\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens\u0027 underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter \"License Terms\"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens\u0027 Global Website (https://www.siemens.com/terms_of_use, hereinafter \"Terms of Use\"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.",
        "title": "Terms of Use"
      },
      {
        "category": "legal_disclaimer",
        "text": "All information products included in https://us-cert.cisa.gov/ics are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.",
        "title": "Legal Notice"
      },
      {
        "category": "other",
        "text": "This CISA CSAF advisory was converted from Siemens ProductCERT\u0027s CSAF advisory.",
        "title": "Advisory Conversion Disclaimer"
      },
      {
        "category": "other",
        "text": "Multiple",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Germany",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Locate control system networks and remote devices behind firewalls and isolate them from business networks.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "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.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "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.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "central@cisa.dhs.gov",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "SSA-541017: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SIRIUS 3RW5 Modbus TCP and SENTRON PAC / 3VA Devices - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-541017.json"
      },
      {
        "category": "self",
        "summary": "SSA-541017: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SIRIUS 3RW5 Modbus TCP and SENTRON PAC / 3VA Devices - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-541017.txt"
      },
      {
        "category": "self",
        "summary": "SSA-541017: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SIRIUS 3RW5 Modbus TCP and SENTRON PAC / 3VA Devices - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-541017.pdf"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-20-343-05 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2020/icsa-20-343-05.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-20-343-05 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-20-343-05"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/topics/industrial-control-systems"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B"
      }
    ],
    "title": "Siemens Embedded TCP/IP Stack Vulnerabilities-AMNESIA:33 (Update C)",
    "tracking": {
      "current_release_date": "2025-05-06T06:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-20-343-05",
      "initial_release_date": "2020-12-08T00:00:00.000000Z",
      "revision_history": [
        {
          "date": "2020-12-08T00:00:00.000000Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-02-09T00:00:00.000000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added additional affected products (SENTRON PAC2200, PAC3200T, 3VA COM100/800, 3VA DSP800) and related fix release information"
        },
        {
          "date": "2021-03-09T00:00:00.000000Z",
          "legacy_version": "1.2",
          "number": "3",
          "summary": "Added solution for SIRIUS 3RW5 communication module Modbus TCP; added reference to additional AMNESIA:33 advisory (SSA-541018)"
        },
        {
          "date": "2021-04-13T00:00:00.000000Z",
          "legacy_version": "1.3",
          "number": "4",
          "summary": "Added download link for SENTRON PAC3200T"
        },
        {
          "date": "2025-05-06T06:00:00.000000Z",
          "legacy_version": "Revision",
          "number": "5",
          "summary": "Revision - Fixing typos"
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV4.2",
                "product": {
                  "name": "SENTRON 3VA COM100/800",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON 3VA COM100/800"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV2.0",
                "product": {
                  "name": "SENTRON 3VA DSP800",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON 3VA DSP800"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.0.5",
                "product": {
                  "name": "SENTRON PAC2200 (without MID Approval)",
                  "product_id": "CSAFPID-0003"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (without MID Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV2.4.5",
                "product": {
                  "name": "SENTRON PAC3200",
                  "product_id": "CSAFPID-0004"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.0.5",
                "product": {
                  "name": "SENTRON PAC3200T",
                  "product_id": "CSAFPID-0005"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200T"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV2.0.1",
                "product": {
                  "name": "SENTRON PAC4200",
                  "product_id": "CSAFPID-0006"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC4200"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV1.1.1",
                "product": {
                  "name": "SIRIUS 3RW5 communication module Modbus TCP",
                  "product_id": "CSAFPID-0007"
                }
              }
            ],
            "category": "product_name",
            "name": "SIRIUS 3RW5 communication module Modbus TCP"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-13988",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The TCP/IP stack (uIP) in affected devices is vulnerable to integer overflow when processing TCP Maximum Segment Size (MSS) options. (FSCT-2020-0008)\n\nAn attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006",
          "CSAFPID-0007"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-13988 - SENTRON 3VA COM100/800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "summary": "CVE-2020-13988 - SENTRON 3VA DSP800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109761031/"
        },
        {
          "summary": "CVE-2020-13988 - SENTRON PAC2200 (without MID Approval)",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "summary": "CVE-2020-13988 - SENTRON PAC3200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "summary": "CVE-2020-13988 - SENTRON PAC3200T",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "summary": "CVE-2020-13988 - SENTRON PAC4200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "summary": "CVE-2020-13988 - SIRIUS 3RW5 communication module Modbus TCP",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109759671/"
        },
        {
          "summary": "CVE-2020-13988 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-13988.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V4.2 or later version",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.0 or later version",
          "product_ids": [
            "CSAFPID-0002"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109761031/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.0.5 or later version",
          "product_ids": [
            "CSAFPID-0003"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.4.5 or later version",
          "product_ids": [
            "CSAFPID-0004"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.0.5 or later version",
          "product_ids": [
            "CSAFPID-0005"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.0.1 or later version",
          "product_ids": [
            "CSAFPID-0006"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V1.1.1 or later version",
          "product_ids": [
            "CSAFPID-0007"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109759671/"
        },
        {
          "category": "mitigation",
          "details": "For successful exploitation, an attacking system must be located in the same Modbus TCP segment as a vulnerable device. Therefore ensure that only trusted systems are attached to that segment and only trusted persons have access.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007"
          ]
        }
      ],
      "title": "CVE-2020-13988"
    }
  ]
}


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