fkie_cve-2023-34328
Vulnerability from fkie_nvd
Published
2024-01-05 17:15
Modified
2025-06-03 15:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previous vCPUs debug mask state. 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT. This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock up the CPU entirely.
References
security@xen.orghttps://xenbits.xenproject.org/xsa/advisory-444.htmlPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://xenbits.xenproject.org/xsa/advisory-444.htmlPatch, Vendor Advisory
Impacted products
Vendor Product Version
xen xen *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "853DC15E-4B7F-40A1-8932-7FE496D93D82",
              "versionEndExcluding": "4.14.0",
              "versionStartIncluding": "4.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "\n[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen\u0027s handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.\n"
    },
    {
      "lang": "es",
      "value": "[Este registro de informaci\u00f3n de la CNA se relaciona con m\u00faltiples CVE; el texto explica qu\u00e9 aspectos/vulnerabilidades corresponden a cada CVE.] Las CPU AMD desde ~2014 tienen extensiones a la funcionalidad de depuraci\u00f3n x86 normal. Xen admite invitados que utilizan estas extensiones. Desafortunadamente, hay errores en el manejo del estado invitado por parte de Xen, lo que lleva a denegaciones de servicio. 1) CVE-2023-34327: una vCPU HVM puede terminar funcionando en el contexto de un estado de m\u00e1scara de depuraci\u00f3n de vCPU anterior. 2) CVE-2023-34328: una vCPU PV puede colocar un punto de interrupci\u00f3n sobre la GDT en vivo. Esto permite que PV vCPU aproveche XSA-156/CVE-2015-8104 y bloquee la CPU por completo."
    }
  ],
  "id": "CVE-2023-34328",
  "lastModified": "2025-06-03T15:15:34.270",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-01-05T17:15:08.730",
  "references": [
    {
      "source": "security@xen.org",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://xenbits.xenproject.org/xsa/advisory-444.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://xenbits.xenproject.org/xsa/advisory-444.html"
    }
  ],
  "sourceIdentifier": "security@xen.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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