VDE-2021-017

Vulnerability from csaf_mbconnectlinegmbh - Published: 2021-07-22 11:35 - Updated: 2025-05-14 12:28
Summary
MB connect line: Privilege escalation in mbDIALUP
Notes
Summary: Multiple Vulnerabilities in mbConnect24serv (a software service of mbDIALUP) can lead to arbitrary code execution due to improper privilege management. Update A, 2021-11-24 corrected fixed version in solution from 3.9R0.4 to 3.9R0.5 Update B, 2022-03-28 Updated CVSS score from CVE-2021-33527 from 7.8 to 9.8 due to new information about the vulnerability
Remediation: Update to 3.9R0.5
Impact: Please consult the CVE entries.
CVE-2021-33527

In MB connect line mbDIALUP versions <=3.9R0.0 a remote attacker can send a specifically crafted HTTP request to the service running with NT AUTHORITY\SYSTEM that will not correctly validate the input. This can lead to an arbitrary code execution with the privileges of the service.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-20 - Improper Input Validation
Vendor Fix Update to 3.9R0.5
CVE-2021-33526

In MB connect line mbDIALUP versions <=3.9R0.0 a low privileged local attacker can send a command to the service running with NT AUTHORITY\SYSTEM instructing it to execute a malicous OpenVPN configuration resulting in arbitrary code execution with the privileges of the service.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-269 - Improper Privilege Management
Vendor Fix Update to 3.9R0.5
References
Acknowledgments
CERT@VDE certvde.com
Claroty Noam Moshe
To clipboard 

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        "organization": "CERT@VDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
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      },
      {
        "names": [
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        "summary": "reported"
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    "lang": "en-US",
    "notes": [
      {
        "category": "summary",
        "text": "Multiple Vulnerabilities in mbConnect24serv (a software service of mbDIALUP) can lead to arbitrary code execution due to improper privilege management.\n\nUpdate A, 2021-11-24\n\ncorrected fixed version in solution from 3.9R0.4 to 3.9R0.5\n\nUpdate B, 2022-03-28\n\nUpdated CVSS score from CVE-2021-33527 from 7.8 to 9.8 due to new information about the vulnerability",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "Update to 3.9R0.5",
        "title": "Remediation"
      },
      {
        "category": "description",
        "text": "Please consult the CVE entries.",
        "title": "Impact"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "security-team@mbconnectline.de",
      "name": "MB connect line GmbH",
      "namespace": "https://mbconnectline.com"
    },
    "references": [
      {
        "category": "external",
        "summary": "MB connect line advisory overview at CERT@VDE",
        "url": "https://certvde.com/en/advisories/vendor/mbconnectline/"
      },
      {
        "category": "self",
        "summary": "VDE-2021-017: MB connect line: Privilege escalation in mbDIALUP - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2021-017"
      },
      {
        "category": "self",
        "summary": "VDE-2021-017: MB connect line: Privilege escalation in mbDIALUP - CSAF",
        "url": "https://mbconnectline.csaf-tp.certvde.com/.well-known/csaf/white/2021/vde-2021-017.json"
      }
    ],
    "title": "MB connect line: Privilege escalation in mbDIALUP",
    "tracking": {
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      "current_release_date": "2025-05-14T12:28:19.000Z",
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          "date": "2021-07-22T11:35:00.000Z",
          "number": "1",
          "summary": "Initial revision."
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        {
          "date": "2021-11-24T11:00:00.000Z",
          "number": "2",
          "summary": "Update A"
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        {
          "date": "2022-03-28T10:00:00.000Z",
          "number": "3",
          "summary": "Update B"
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        {
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        "name": "Improper Input Validation"
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      "notes": [
        {
          "category": "description",
          "text": "In MB connect line mbDIALUP versions \u003c=3.9R0.0 a remote attacker can send a specifically crafted HTTP request to the service running with NT AUTHORITY\\SYSTEM that will not correctly validate the input. This can lead to an arbitrary code execution with the privileges of the service.",
          "title": "Vulnerability Description"
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      "product_status": {
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          "details": "Update to 3.9R0.5",
          "product_ids": [
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      "scores": [
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          "cvss_v3": {
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            "attackVector": "NETWORK",
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            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.8,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
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        "name": "Improper Privilege Management"
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      "notes": [
        {
          "category": "description",
          "text": "In MB connect line mbDIALUP versions \u003c=3.9R0.0 a low privileged local attacker can send a command to the service running with NT AUTHORITY\\SYSTEM instructing it to execute a malicous OpenVPN configuration resulting in arbitrary code execution with the privileges of the service.",
          "title": "Vulnerability Description"
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            "environmentalSeverity": "HIGH",
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          "products": [
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        }
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      "title": "CVE-2021-33526"
    }
  ]
}


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