VDE-2020-007

Vulnerability from csaf_wagogmbhcokg - Published: 2020-03-09 09:10 - Updated: 2020-03-09 09:10
Summary
WAGO: Web-Based Management Denial of Service
Notes
Summary: The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for commissioning and update. The controller is an embedded device which has limited resources. The vulnerability described here takes advantage of this fact.With special crafted requests it is possible to have a denial of service of the WBM.
Impact: The default configuration of the web server limits the number of concurrent processes, which can be abused to cause a DoS of the WBM.This vulnerability allows an attacker, who has access to the device, to cause a denial of service of the WBM, by sending special crafted requests.
Mitigation: - 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 Due to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.
CVE-2019-5149

The WBM web application on firmwares prior to 03.02.02 and 03.01.07 on the WAGO PFC100 and PFC2000, respectively, runs on a lighttpd web server and makes use of the FastCGI module, which is intended to provide high performance for all Internet applications without the penalties of Web server APIs. However, the default configuration of this module appears to limit the number of concurrent php-cgi processes to two, which can be abused to cause a denial of service of the entire web server. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12) and version 03.02.02(14).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-400 - Uncontrolled Resource Consumption
Mitigation - 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 Due to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.
References
Acknowledgments
CERT@VDE certvde.com
Cisco Talos Daniel Patrick DeSantis
To clipboard 

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        "summary": "coordination",
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      {
        "names": [
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    "notes": [
      {
        "category": "summary",
        "text": "The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for commissioning and update. The controller is an embedded device which has limited resources. The vulnerability described here takes advantage of this fact.With special crafted requests it is possible to have a denial of service of the WBM.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "The default configuration of the web server limits the number of concurrent processes, which can be abused to cause a DoS of the WBM.This vulnerability allows an attacker, who has access to the device, to cause a denial of service of the WBM, by sending special crafted requests.",
        "title": "Impact"
      },
      {
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        "text": "- Follow the instructions in WAGOs handbook Cyber Security for Controller\n- Restrict network access to the device.\n- Do not directly connect the device to the internet\n\nDue to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.",
        "title": "Mitigation"
      }
    ],
    "publisher": {
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      "contact_details": "psirt@wago.com",
      "name": "WAGO GmbH \u0026 Co. KG",
      "namespace": "https://www.wago.com/psirt"
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    "references": [
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        "category": "self",
        "summary": "VDE-2020-007: WAGO: Web-Based Management Denial of Service - HTML",
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      },
      {
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    "title": "WAGO: Web-Based Management Denial of Service",
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  "vulnerabilities": [
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      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "notes": [
        {
          "category": "description",
          "text": "The WBM web application on firmwares prior to 03.02.02 and 03.01.07 on the WAGO PFC100 and PFC2000, respectively, runs on a lighttpd web server and makes use of the FastCGI module, which is intended to provide high performance for all Internet applications without the penalties of Web server APIs. However, the default configuration of this module appears to limit the number of concurrent php-cgi processes to two, which can be abused to cause a denial of service of the entire web server. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12) and version 03.02.02(14).",
          "title": "Vulnerability Description"
        }
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          "CSAFPID-31005"
        ]
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          "details": "- Follow the instructions in WAGOs handbook Cyber Security for Controller\n- Restrict network access to the device.\n- Do not directly connect the device to the internet\n\nDue to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalScore": 7.5,
            "environmentalSeverity": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "temporalSeverity": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002",
            "CSAFPID-31003",
            "CSAFPID-31004",
            "CSAFPID-31005"
          ]
        }
      ],
      "title": "CVE-2019-5149"
    }
  ]
}


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