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CVE-2019-5023

Estado: ModificadaMedia (5.9)—

Se presenta una vulnerabilidad explotable en el parche grsecurity PaX para la función read_kmem, en PaX desde la versión pax-linux-4.9.8-test1 hasta 4.9.24-test7, grsecurity official desde la versión grsecurity-3.1-4.9.8-201702060653 hasta grsecurity-3.1-4.9.24-201704252333, grsecurity unofficial desde la versión v4.9.25-unofficialgrsec hasta v4.9.74-unofficialgrsec. PaX agrega un búfer temporal a la función read_kmem, que nunca es liberado cuando una dirección no válida es suministrada. Esto resulta en una pérdida de memoria que puede causar un bloqueo del sistema. Un atacante necesita inducir una lectura en /dev/kmem usando una dirección no válida para explotar esta vulnerabilidad.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Opensrcsec — GrsecurityOpensrcsec — PAX

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-5023",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "talos-cna@cisco.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 5.9,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 1.4
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "talos-cna@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "PaX",
          "versions": [
            {
              "status": "affected",
              "version": "PaX pax-linux-4.9.24-test7.patch (latest version available to the public) grsecurity grsecurity-3.1-4.9.24-201704252333.patch (latest official version available to the public) v4.9.74-unofficial_grsec (latest unofficial version available to the public)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-10-31T21:15:13.373",
  "references": [
    {
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "talos-cna@cisco.com"
    },
    {
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "talos-cna@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An exploitable vulnerability exists in the grsecurity PaX patch for the function read_kmem, in PaX from version pax-linux-4.9.8-test1 to 4.9.24-test7, grsecurity official from version grsecurity-3.1-4.9.8-201702060653 to grsecurity-3.1-4.9.24-201704252333, grsecurity unofficial from version v4.9.25-unofficialgrsec to v4.9.74-unofficialgrsec. PaX adds a temp buffer to the read_kmem function, which is never freed when an invalid address is supplied. This results in a memory leakage that can lead to a crash of the system. An attacker needs to induce a read to /dev/kmem using an invalid address to exploit this vulnerability."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad explotable en el parche grsecurity PaX para la función read_kmem, en PaX desde la versión pax-linux-4.9.8-test1 hasta 4.9.24-test7, grsecurity official desde la versión grsecurity-3.1-4.9.8-201702060653 hasta grsecurity-3.1-4.9.24-201704252333, grsecurity unofficial desde la versión v4.9.25-unofficialgrsec hasta v4.9.74-unofficialgrsec. PaX agrega un búfer temporal a la función read_kmem, que nunca es liberado cuando una dirección no válida es suministrada. Esto resulta en una pérdida de memoria que puede causar un bloqueo del sistema. Un atacante necesita inducir una lectura en /dev/kmem usando una dirección no válida para explotar esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T02:37:00.153",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:official:*:*:*",
              "vulnerable": true,
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              "versionEndIncluding": "3.1-4.9.24-201704252333",
              "versionStartIncluding": "3.1-4.9.8-201702060653"
            },
            {
              "criteria": "cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:unofficial:*:*:*",
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              "matchCriteriaId": "187DBEE6-4986-41C1-8735-38EEF94A3108",
              "versionEndIncluding": "4.9.74",
              "versionStartIncluding": "4.9.25"
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              "matchCriteriaId": "319F79C1-0EA7-44F5-8837-FC4A146AB160",
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            }
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          "operator": "OR"
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  ],
  "sourceIdentifier": "talos-cna@cisco.com"
}