VDE-2021-031

Vulnerability from csaf_mbconnectlinegmbh - Published: 2021-07-22 11:33 - Updated: 2025-05-14 12:28
Summary
MB connect line: Apache Guacamole related vulnerabilities in mbCONNECT24
Notes
Summary: Two vulnerabilities in mbCONNECT24 and mymbCONNECT24 can lead to information disclosure and arbitrary code execution. Please consult the CVE entries for details.
Remediation: Update to 2.9.0
CVE-2020-9498

Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.

6.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
mbCONNECT24 <=2.8.0
MB connect line / Software / mbCONNECT24
 <=2.8.0
Vendor Fix
mymbCONNECT24 <=2.8.0
MB connect line / Software / mymbCONNECT24
 <=2.8.0
Product Identifier Version Remediation
mbCONNECT24 2.9.0
MB connect line / Software / mbCONNECT24
 2.9.0
mymbCONNECT24 2.9.0
MB connect line / Software / mymbCONNECT24
 2.9.0
CVE-2020-9497

Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.

4.4 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
CWE-20 - Improper Input Validation
Affected products
Product Identifier Version Remediation
mbCONNECT24 <=2.8.0
MB connect line / Software / mbCONNECT24
 <=2.8.0
Vendor Fix
mymbCONNECT24 <=2.8.0
MB connect line / Software / mymbCONNECT24
 <=2.8.0
Product Identifier Version Remediation
mbCONNECT24 2.9.0
MB connect line / Software / mbCONNECT24
 2.9.0
mymbCONNECT24 2.9.0
MB connect line / Software / mymbCONNECT24
 2.9.0
References
Acknowledgments
CERT@VDE certvde.com
To clipboard 

{
  "document": {
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      {
        "organization": "CERT@VDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
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    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
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        "url": "https://www.first.org/tlp/"
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    },
    "lang": "en-US",
    "notes": [
      {
        "category": "summary",
        "text": "Two vulnerabilities in mbCONNECT24 and mymbCONNECT24 can lead to information disclosure and arbitrary code execution.\n\nPlease consult the CVE entries for details.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "Update to 2.9.0",
        "title": "Remediation"
      }
    ],
    "publisher": {
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      "contact_details": "security-team@mbconnectline.de",
      "name": "MB connect line GmbH",
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    },
    "references": [
      {
        "category": "external",
        "summary": "MB connect line advisory overview at CERT@VDE",
        "url": "https://certvde.com/en/advisories/vendor/mbconnectline/"
      },
      {
        "category": "self",
        "summary": "VDE-2021-031: MB connect line: Apache Guacamole related vulnerabilities in mbCONNECT24 - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2021-031"
      },
      {
        "category": "self",
        "summary": "VDE-2021-031: MB connect line: Apache Guacamole related vulnerabilities in mbCONNECT24 - CSAF",
        "url": "https://mbconnectline.csaf-tp.certvde.com/.well-known/csaf/white/2021/vde-2021-031.json"
      }
    ],
    "title": "MB connect line: Apache Guacamole related vulnerabilities in mbCONNECT24",
    "tracking": {
      "aliases": [
        "VDE-2021-031"
      ],
      "current_release_date": "2025-05-14T12:28:19.000Z",
      "generator": {
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          "date": "2021-07-22T11:35:00.000Z",
          "number": "1",
          "summary": "Initial revision."
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          "summary": "Fix: version space, added distribution"
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                    "name": "\u003c=2.8.0",
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                      "product_id": "CSAFPID-51001"
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        "summary": "Affected Products"
      },
      {
        "group_id": "CSAFGID-0002",
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  "vulnerabilities": [
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      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "description",
          "text": "Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.",
          "title": "Vulnerability Description"
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          "CSAFPID-52002"
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      "remediations": [
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          "category": "vendor_fix",
          "details": "Update to 3.9R0.5",
          "product_ids": [
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          ]
        }
      ],
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 6.7,
            "environmentalSeverity": "MEDIUM",
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            "version": "3.1"
          },
          "products": [
            "CSAFPID-51001",
            "CSAFPID-51002"
          ]
        }
      ],
      "title": "CVE-2020-9498"
    },
    {
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      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "notes": [
        {
          "category": "description",
          "text": "Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.",
          "title": "Vulnerability Description"
        }
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          "CSAFPID-52002"
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        }
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            "attackVector": "LOCAL",
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            "baseSeverity": "MEDIUM",
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            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
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            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
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            "CSAFPID-51002"
          ]
        }
      ],
      "title": "CVE-2020-9497"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.