VDE-2024-029

Vulnerability from csaf_phoenixcontactgmbhcokg - Published: 2024-06-11 06:00 - Updated: 2024-06-11 06:00
Summary
Phoenix Contact: Unbounded growth of OpenSSL session cache in multiple FL MGUARD devices
Notes
Summary: The OpenSSL library used in the affected products is vulnerable to an unbounded growth of the session cache in the TLSv1.3 implementation.
Impact: A remote attacker can exhaust all memory by establishing a large number of TLSv1.3 connections to the web interface, causing the device to reboot.
Mitigation: Phoenix Contact recommends that customers restrict network access to the device's web interface to as few networks as possible.
Remediation: Phoenix Contact recommends upgrading the firmware of affected devices to version 1.8.0, which fixes the vulnerability.
CVE-2024-2511

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1325 - Improperly Controlled Sequential Memory Allocation
Mitigation Phoenix Contact recommends that customers restrict network access to the device's web interface to as few networks as possible.
Vendor Fix Phoenix Contact recommends upgrading the firmware of affected devices to version 1.8.0, which fixes the vulnerability.
References
Acknowledgments
CERT@VDE certvde.com
To clipboard 

{
  "document": {
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        "summary": "coordination",
        "urls": [
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      {
        "category": "summary",
        "text": "\n\n\nThe OpenSSL library used in the affected products is vulnerable to an unbounded growth of the session cache in the TLSv1.3 implementation. \n\n\n",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "A remote attacker can exhaust all memory by establishing a large number of TLSv1.3 connections to the web interface, causing the device to reboot.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "Phoenix Contact recommends that customers restrict network access to the device\u0027s web interface to as few networks as possible.",
        "title": "Mitigation"
      },
      {
        "category": "description",
        "text": "Phoenix Contact recommends upgrading the firmware of affected devices to version 1.8.0, which fixes the vulnerability.",
        "title": " Remediation"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@phoenixcontact.com",
      "name": "Phoenix Contact GmbH \u0026 Co. KG",
      "namespace": "https://phoenixcontact.com/psirt"
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    "references": [
      {
        "category": "self",
        "summary": "VDE-2024-029: Phoenix Contact: Unbounded growth of OpenSSL session cache in multiple FL MGUARD devices - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2024-029/"
      },
      {
        "category": "self",
        "summary": "VDE-2024-029: Phoenix Contact: Unbounded growth of OpenSSL session cache in multiple FL MGUARD devices - CSAF",
        "url": "https://phoenixcontact.csaf-tp.certvde.com/.well-known/csaf/white/2024/vde-2024-029.json"
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        "url": "https://phoenixcontact.com/psirt"
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        "summary": "CERT@VDE Security Advisories for Phoenix Contact GmbH \u0026 Co. KG",
        "url": "https://certvde.com/en/advisories/vendor/phoenixcontact/"
      }
    ],
    "title": "Phoenix Contact: Unbounded growth of OpenSSL session cache in multiple FL MGUARD devices",
    "tracking": {
      "aliases": [
        "VDE-2024-029"
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      "current_release_date": "2024-06-11T06:00:00.000Z",
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          "number": "1",
          "summary": "Initial revision."
        }
      ],
      "status": "final",
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  "product_tree": {
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        "branches": [
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            "branches": [
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2024-2511",
      "cwe": {
        "id": "CWE-1325",
        "name": "Improperly Controlled Sequential Memory Allocation"
      },
      "notes": [
        {
          "category": "description",
          "text": "Issue summary: Some non-default TLS server configurations can cause unbounded\nmemory growth when processing TLSv1.3 sessions\n\nImpact summary: An attacker may exploit certain server configurations to trigger\nunbounded memory growth that would lead to a Denial of Service\n\nThis problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is\nbeing used (but not if early_data support is also configured and the default\nanti-replay protection is in use). In this case, under certain conditions, the\nsession cache can get into an incorrect state and it will fail to flush properly\nas it fills. The session cache will continue to grow in an unbounded manner. A\nmalicious client could deliberately create the scenario for this failure to\nforce a Denial of Service. It may also happen by accident in normal operation.\n\nThis issue only affects TLS servers supporting TLSv1.3. It does not affect TLS\nclients.\n\nThe FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL\n1.0.2 is also not affected by this issue.",
          "title": "Vulnerability Description"
        }
      ],
      "product_status": {
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          "CSAFPID-32002"
        ],
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          "CSAFPID-31002"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Phoenix Contact recommends that customers restrict network access to the device\u0027s web interface to as few networks as possible.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Phoenix Contact recommends upgrading the firmware of affected devices to version 1.8.0, which fixes the vulnerability.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "environmentalScore": 5.9,
            "environmentalSeverity": "MEDIUM",
            "temporalScore": 5.9,
            "temporalSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001",
            "CSAFPID-31002"
          ]
        }
      ],
      "title": "CVE-2024-2511"
    }
  ]
}


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