{
  "document": {
    "acknowledgments": [
      {
        "organization": "Nozomi Networks",
        "summary": "reporting this vulnerability to CISA"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov",
        "title": "CISA Disclaimer"
      },
      {
        "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": "summary",
        "text": "Successful exploitation of this vulnerability could cause unintended connection from an internal network to an external network.",
        "title": "Risk evaluation"
      },
      {
        "category": "other",
        "text": "Commercial Facilities, Critical Manufacturing, Energy",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "France",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\nCISA also provides a section for control systems security recommended practices on the ICS webpage onus-cert.cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      },
      {
        "category": "other",
        "text": "No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely.",
        "title": "Exploitability"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "Email: CISAservicedesk@cisa.dhs.gov;\n Toll Free: 1-888-282-0870",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-336-01 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-336-01.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-336-01 Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-21-336-01"
      },
      {
        "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://us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B"
      }
    ],
    "title": "Schneider Electric SESU",
    "tracking": {
      "current_release_date": "2021-12-02T00:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-21-336-01",
      "initial_release_date": "2021-12-02T00:00:00.000000Z",
      "revision_history": [
        {
          "date": "2021-12-02T00:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "ICSA-21-336-01 Schneider Electric SESU"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e= 2.3.0 | \u003c= 2.5.1",
                "product": {
                  "name": "Schneider Electric Software Update: v2.3.0 through v2.5.1",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "Schneider Electric Software Update"
          }
        ],
        "category": "vendor",
        "name": "Schneider Electric Software, LLC"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-22799",
      "cwe": {
        "id": "CWE-331",
        "name": "Insufficient Entropy"
      },
      "notes": [
        {
          "category": "summary",
          "text": "An insufficient entropy vulnerability exists, which could cause unintended connection from an internal network to an external network when an attacker manages to decrypt the SESU proxy password from the registry.CVE-2021-22799 has been assigned to this vulnerability. A CVSS v3 base score of 3.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N).",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "web.nvd.nist.gov",
          "url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-22799"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "If SESU is installed (assuming SESU is configured as \u201cmanaged product\u201d inside the SESU application) it will indicate a security update is available. Click to download and install the new SESU version.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "If SESU is not installed, download SESU (automatic download) and follow the installation instructions.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://www.seupdate.schneider-electric.com/download/SystemConsistency/SoftwareUpdate/SESU_latest_version/SESU_latest_setup_sfx.exe"
        },
        {
          "category": "mitigation",
          "details": "Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Place all controllers in locked cabinets and never leave them in the \u201cProgram\u201d mode.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Never connect programming software to any network other than the network intended for that device.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Minimize network exposure for all control system devices and systems and ensure they are not accessible from the Internet.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "When remote access is required, use secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN are only as secure as the connected devices.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "See Schneider Electric Security Notification SEVD-2021-313-02 for more information.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-313-02"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 3.8,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ]
    }
  ]
}