ICSA-21-068-03
Vulnerability from csaf_cisa
Published
2021-03-09 00:00
Modified
2021-04-13 00:00
Summary
Siemens SCALANCE and RUGGEDCOM Devices (Update A)

Notes

Summary
Several firmware versions of the SCALANCE and RUGGEDCOM devices listed below are affected by a vulnerability in the passive listening feature that could allow an attacker to cause a reboot or, under specific circumstances, attain remote code execution of the affected devices. Siemens has released updates for the affected products and recommends to update to the latest versions.
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.



{
   document: {
      acknowledgments: [
         {
            organization: "Siemens ProductCERT",
            summary: "reporting this vulnerability to CISA.",
         },
      ],
      category: "Siemens 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: "Several firmware versions of the SCALANCE and RUGGEDCOM devices listed below are affected by a vulnerability in the passive listening feature that could allow an attacker to cause a reboot or, under specific circumstances, attain remote code execution of the affected devices.\n\nSiemens has released updates for the affected products and recommends to update to the latest versions.",
            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' 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' 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.",
            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's 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-979775: Stack Overflow Vulnerability in SCALANCE and RUGGEDCOM Devices - CSAF Version",
            url: "https://cert-portal.siemens.com/productcert/csaf/ssa-979775.json",
         },
         {
            category: "self",
            summary: "SSA-979775: Stack Overflow Vulnerability in SCALANCE and RUGGEDCOM Devices - TXT Version",
            url: "https://cert-portal.siemens.com/productcert/txt/ssa-979775.txt",
         },
         {
            category: "self",
            summary: "SSA-979775: Stack Overflow Vulnerability in SCALANCE and RUGGEDCOM Devices - PDF Version",
            url: "https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf",
         },
         {
            category: "self",
            summary: "ICS Advisory ICSA-21-068-03 JSON",
            url: "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-068-03.json",
         },
         {
            category: "self",
            summary: "ICS Advisory ICSA-21-068-03 - Web Version",
            url: "https://www.cisa.gov/news-events/ics-advisories/icsa-21-068-03",
         },
         {
            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 SCALANCE and RUGGEDCOM Devices (Update A)",
      tracking: {
         current_release_date: "2021-04-13T00:00:00.000000Z",
         generator: {
            engine: {
               name: "CISA CSAF Generator",
               version: "1.0.0",
            },
         },
         id: "ICSA-21-068-03",
         initial_release_date: "2021-03-09T00:00:00.000000Z",
         revision_history: [
            {
               date: "2021-03-09T00:00:00.000000Z",
               legacy_version: "1.0",
               number: "1",
               summary: "Publication Date",
            },
            {
               date: "2021-04-13T00:00:00.000000Z",
               legacy_version: "1.1",
               number: "2",
               summary: "Added solution for SCALANCE M-800/S615 and RUGGEDCOM RM1224; updated solution for SCALANCE XR-300WG",
            },
         ],
         status: "final",
         version: "2",
      },
   },
   product_tree: {
      branches: [
         {
            branches: [
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: ">=V4.3_and_<V6.4",
                        product: {
                           name: "RUGGEDCOM RM1224",
                           product_id: "CSAFPID-0001",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "RUGGEDCOM RM1224",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: ">=V4.3_and_<V6.4",
                        product: {
                           name: "SCALANCE M-800",
                           product_id: "CSAFPID-0002",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE M-800",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: ">=V4.3_and_<V6.4",
                        product: {
                           name: "SCALANCE S615",
                           product_id: "CSAFPID-0003",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE S615",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: ">=V2.0_and_<V2.1.3",
                        product: {
                           name: "SCALANCE SC-600 Family",
                           product_id: "CSAFPID-0004",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE SC-600 Family",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V4.1",
                        product: {
                           name: "SCALANCE XB-200",
                           product_id: "CSAFPID-0005",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XB-200",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V4.1",
                        product: {
                           name: "SCALANCE XC-200",
                           product_id: "CSAFPID-0006",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XC-200",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V4.1",
                        product: {
                           name: "SCALANCE XF-200BA",
                           product_id: "CSAFPID-0007",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XF-200BA",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V6.2",
                        product: {
                           name: "SCALANCE XM400",
                           product_id: "CSAFPID-0008",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XM400",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V4.1",
                        product: {
                           name: "SCALANCE XP-200",
                           product_id: "CSAFPID-0009",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XP-200",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V6.2",
                        product: {
                           name: "SCALANCE XR500",
                           product_id: "CSAFPID-0010",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XR500",
               },
               {
                  branches: [
                     {
                        category: "product_version_range",
                        name: "<V4.1",
                        product: {
                           name: "SCALANCE XR-300WG",
                           product_id: "CSAFPID-0011",
                        },
                     },
                  ],
                  category: "product_name",
                  name: "SCALANCE XR-300WG",
               },
            ],
            category: "vendor",
            name: "Siemens",
         },
      ],
   },
   vulnerabilities: [
      {
         cve: "CVE-2021-25667",
         cwe: {
            id: "CWE-121",
            name: "Stack-based Buffer Overflow",
         },
         notes: [
            {
               category: "summary",
               text: "Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution.\n\nSuccessful exploitation requires the passive listening feature of the device to be active.",
               title: "Summary",
            },
         ],
         product_status: {
            known_affected: [
               "CSAFPID-0001",
               "CSAFPID-0002",
               "CSAFPID-0003",
               "CSAFPID-0004",
               "CSAFPID-0005",
               "CSAFPID-0006",
               "CSAFPID-0007",
               "CSAFPID-0008",
               "CSAFPID-0009",
               "CSAFPID-0010",
               "CSAFPID-0011",
            ],
         },
         references: [
            {
               summary: "CVE-2021-25667 - RUGGEDCOM RM1224",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE M-800",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE S615",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE SC-600 Family",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109793041/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XB-200",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XC-200",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XF-200BA",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XM400",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109764409/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XP-200",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XR500",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109761425/",
            },
            {
               summary: "CVE-2021-25667 - SCALANCE XR-300WG",
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               summary: "CVE-2021-25667 Mitre 5.0 json",
               url: "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-25667.json",
            },
         ],
         remediations: [
            {
               category: "vendor_fix",
               details: "Update to V6.4 or later version",
               product_ids: [
                  "CSAFPID-0001",
                  "CSAFPID-0002",
                  "CSAFPID-0003",
               ],
               url: "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
            },
            {
               category: "vendor_fix",
               details: "Update to V2.1.3 or later version",
               product_ids: [
                  "CSAFPID-0004",
               ],
               url: "https://support.industry.siemens.com/cs/ww/en/view/109793041/",
            },
            {
               category: "vendor_fix",
               details: "Update to V4.1 or later version",
               product_ids: [
                  "CSAFPID-0005",
                  "CSAFPID-0006",
                  "CSAFPID-0007",
                  "CSAFPID-0009",
                  "CSAFPID-0011",
               ],
               url: "https://support.industry.siemens.com/cs/ww/en/view/109762982/",
            },
            {
               category: "vendor_fix",
               details: "Update to V6.2 or later version",
               product_ids: [
                  "CSAFPID-0008",
               ],
               url: "https://support.industry.siemens.com/cs/ww/en/view/109764409/",
            },
            {
               category: "vendor_fix",
               details: "Update to V6.2 or later version",
               product_ids: [
                  "CSAFPID-0010",
               ],
               url: "https://support.industry.siemens.com/cs/ww/en/view/109761425/",
            },
            {
               category: "mitigation",
               details: "Deactivate the STP passive listening feature of the vulnerable devices",
               product_ids: [
                  "CSAFPID-0001",
                  "CSAFPID-0002",
                  "CSAFPID-0003",
                  "CSAFPID-0004",
                  "CSAFPID-0005",
                  "CSAFPID-0006",
                  "CSAFPID-0007",
                  "CSAFPID-0008",
                  "CSAFPID-0009",
                  "CSAFPID-0010",
                  "CSAFPID-0011",
               ],
            },
         ],
         scores: [
            {
               cvss_v3: {
                  baseScore: 8.8,
                  baseSeverity: "HIGH",
                  vectorString: "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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",
                  "CSAFPID-0008",
                  "CSAFPID-0009",
                  "CSAFPID-0010",
                  "CSAFPID-0011",
               ],
            },
         ],
         title: "CVE-2021-25667",
      },
   ],
}


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Nomenclature

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