VDE-2020-010

Vulnerability from csaf_wagogmbhcokg - Published: 2020-03-09 09:25 - Updated: 2020-03-09 09:25
Summary
WAGO: Cloud Connectivity Remote Code Execution Vulnerability
Notes
Summary: An attacker needs an authorized login with administrative privileges on the device in order to exploit the herein mentioned vulnerability. The weakness allows an attacker which has admin privileges on the device to redirect to his own Azure cloud account and install malicious software with the firmware update functionality.
Impact: These vulnerabilities allow an attacker which has admin privileges, an Azure cloud account and also access to the device to redirect the cloud connection. With thus he is able to install any malicious software by manipulating the firmware update file. An exploitable remote code execution vulnerability exists in the Cloud Connectivity functionality of affected WAGO products. A specially crafted XML file will direct the Cloud Connectivity service to download and execute a shell script with root privileges.
Mitigation: Check the hashes of the Update packet, do not use update files which has a different hash then the original one Follow the instructions in WAGOs handbook Cyber Security for Controller Restrict network access to the device. Do not directly connect the device to the internet Use an encrypted VPN connection to the device Disable unused TCP/UDP-ports Use strong passwords for all user accounts, especially for administrative user accounts on the device.
CVE-2019-5161

An exploitable remote code execution vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 versions 03.02.02(14), 03.01.07(13), and 03.00.39(12). A specially crafted XML file will direct the Cloud Connectivity service to download and execute a shell script with root privileges.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-345 - Insufficient Verification of Data Authenticity
Mitigation Check the hashes of the Update packet, do not use update files which has a different hash then the original one Follow the instructions in WAGOs handbook Cyber Security for Controller Restrict network access to the device. Do not directly connect the device to the internet Use an encrypted VPN connection to the device Disable unused TCP/UDP-ports Use strong passwords for all user accounts, especially for administrative user accounts on the device.
References
Acknowledgments
CERT@VDE certvde.com
Cisco Talos Kelly Leuschner
To clipboard 

{
  "document": {
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        "summary": "coordination",
        "urls": [
          "https://certvde.com"
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      {
        "names": [
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      {
        "category": "summary",
        "text": "An attacker needs an authorized login with administrative privileges on the device in order to exploit the herein mentioned vulnerability.\nThe weakness allows an attacker which has admin privileges on the device to redirect to his own Azure cloud account and install malicious software with the firmware update functionality.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "These vulnerabilities allow an attacker which has admin privileges, an Azure cloud account and also access to the device to redirect the cloud connection. With thus he is able to install any malicious software by manipulating the firmware update file.\n\nAn exploitable remote code execution vulnerability exists in the Cloud Connectivity functionality of affected WAGO products. A specially crafted XML file will direct the Cloud Connectivity service to download and execute a shell script with root privileges.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "Check the hashes of the Update packet, do not use update files which has a different hash then the original one\nFollow the instructions in WAGOs handbook Cyber Security for Controller\nRestrict network access to the device.\nDo not directly connect the device to the internet\nUse an encrypted VPN connection to the device\nDisable unused TCP/UDP-ports\n\nUse strong passwords for all user accounts, especially for administrative user accounts on the device.",
        "title": "Mitigation"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@wago.com",
      "name": "WAGO GmbH \u0026 Co. KG",
      "namespace": "https://www.wago.com/psirt"
    },
    "references": [
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for Wago",
        "url": "https://certvde.com/en/advisories/vendor/wago"
      },
      {
        "category": "self",
        "summary": "VDE-2020-010: WAGO: Cloud Connectivity Remote Code Execution Vulnerability - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2020-010"
      },
      {
        "category": "self",
        "summary": "VDE-2020-010: WAGO: Cloud Connectivity Remote Code Execution Vulnerability - CSAF",
        "url": "https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2020/vde-2020-010.json"
      }
    ],
    "title": "WAGO: Cloud Connectivity Remote Code Execution Vulnerability",
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          "number": "1",
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      "status": "final",
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  "product_tree": {
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          "CSAFPID-31002",
          "CSAFPID-31003",
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2019-5161",
      "cwe": {
        "id": "CWE-345",
        "name": "Insufficient Verification of Data Authenticity"
      },
      "notes": [
        {
          "audience": "all",
          "category": "description",
          "text": "An exploitable remote code execution vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 versions 03.02.02(14), 03.01.07(13), and 03.00.39(12). A specially crafted XML file will direct the Cloud Connectivity service to download and execute a shell script with root privileges.",
          "title": "Vulnerability Description"
        }
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          "CSAFPID-31002",
          "CSAFPID-31003",
          "CSAFPID-31004",
          "CSAFPID-31005"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Check the hashes of the Update packet, do not use update files which has a different hash then the original one\nFollow the instructions in WAGOs handbook Cyber Security for Controller\nRestrict network access to the device.\nDo not directly connect the device to the internet\nUse an encrypted VPN connection to the device\nDisable unused TCP/UDP-ports\n\nUse strong passwords for all user accounts, especially for administrative user accounts on the device.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.1,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "temporalScore": 9.1,
            "temporalSeverity": "CRITICAL",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004",
            "CSAFPID-31005"
          ]
        }
      ],
      "title": "CVE-2019-5161"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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