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CVE-2020-35512

Estado: ModificadaAlta (7.8)—

A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors

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 (1)

Freedesktop — Dbus

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-35512",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-35512",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-19T15:31:25.634957Z"
        }
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    ],
    "cvssMetricV2": [
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          "baseScore": 7.2,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
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        "cvssData": {
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
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        "exploitabilityScore": 1.8
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  "affected": [
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      "affectedData": [
        {
          "vendor": "n/a",
          "product": "D-Bus Development branch",
          "versions": [
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          "product": "dbus-1.10.x and older branches (EOL)",
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  ],
  "published": "2021-02-15T17:15:12.993",
  "references": [
    {
      "url": "https://bugs.gentoo.org/755392",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1909101",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/issues/305#note_829128",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://security-tracker.debian.org/tracker/CVE-2020-35512",
      "source": "secalert@redhat.com"
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    {
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      "tags": [
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    {
      "url": "https://gitlab.freedesktop.org/dbus/dbus/-/issues/305#note_829128",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security-tracker.debian.org/tracker/CVE-2020-35512",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors"
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo de uso de la memoria previamente liberada D-Bus rama de desarrollo versiones iguales o anteriores a 1.13.16, dbus-1.12.x rama estable versiones iguales o anteriores a 1.12.18, y dbus-1.10.x y ramas anteriores versiones iguales o anteriores a 1.10.30 cuando un sistema tiene múltiples nombres de usuario que comparten el mismo UID. Cuando un conjunto de reglas de política hace referencia a estos nombres de usuario, D-Bus puede liberar algo de memoria en la pila, que sigue siendo utilizada por las estructuras de datos necesarias para los otros nombres de usuario que comparten el UID, lo que puede provocar un fallo u otros comportamientos indefinidos"
    }
  ],
  "lastModified": "2026-06-17T03:13:50.667",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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          "operator": "OR"
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  "sourceIdentifier": "secalert@redhat.com"
}