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CVE-2024-29069

Estado: ModificadaAlta (7.3)—

In snapd versions prior to 2.62, snapd failed to properly check the destination of symbolic links when extracting a snap. The snap format is a squashfs file-system image and so can contain symbolic links and other file types. Various file entries within the snap squashfs image (such as icons and desktop files etc) are directly read by snapd when it is extracted. An attacker who could convince a user to install a malicious snap which contained symbolic links at these paths could then cause snapd to write out the contents of the symbolic link destination into a world-readable directory. This in-turn could allow an unprivileged user to gain access to privileged information.

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)

Canonical — Snapd

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-29069",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-29069",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-07-26T13:27:42.541639Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@ubuntu.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 1.3
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.3,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.3
      }
    ]
  },
  "affected": [
    {
      "source": "security@ubuntu.com",
      "affectedData": [
        {
          "repo": "https://github.com/snapcore/snapd/",
          "vendor": "Canonical",
          "modules": [
            "squashfs"
          ],
          "product": "snapd",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.62",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "Linux"
          ],
          "packageName": "snapd",
          "programFiles": [
            "snap/container.go",
            "snap/snapdir/snapdir.go",
            "snap/squashfs/squashfs.go"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2024-07-25T20:15:04.483",
  "references": [
    {
      "url": "https://github.com/snapcore/snapd/pull/13682",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "security@ubuntu.com"
    },
    {
      "url": "https://github.com/snapcore/snapd/pull/13682",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@ubuntu.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-610"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In snapd versions prior to 2.62, snapd failed to properly check the\ndestination of symbolic links when extracting a snap. The snap format \nis a squashfs file-system image and so can contain symbolic links and\nother file types. Various file entries within the snap squashfs image\n(such as icons and desktop files etc) are directly read by snapd when\nit is extracted. An attacker who could convince a user to install a\nmalicious snap which contained symbolic links at these paths could then \ncause snapd to write out the contents of the symbolic link destination\ninto a world-readable directory. This in-turn could allow an unprivileged\nuser to gain access to privileged information."
    },
    {
      "lang": "es",
      "value": "En versiones de snapd anteriores a la 2.62, snapd no podía verificar correctamente el destino de los enlaces simbólicos al extraer un snap. El formato snap es una imagen del sistema de archivos squashfs y, por lo tanto, puede contener enlaces simbólicos y otros tipos de archivos. snapd lee directamente varias entradas de archivos dentro de la imagen de snap squashfs (como íconos y archivos de escritorio, etc.) cuando se extrae. Un atacante que pudiera convencer a un usuario de que instalara un complemento malicioso que contuviera enlaces simbólicos en estas rutas podría hacer que snapd escribiera el contenido del destino del enlace simbólico en un directorio legible por todo el mundo. Esto, a su vez, podría permitir que un usuario sin privilegios obtenga acceso a información privilegiada."
    }
  ],
  "lastModified": "2026-06-17T07:22:21.740",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:canonical:snapd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A4A95DA5-EB47-48AA-B9C6-EB6D1489E832",
              "versionEndExcluding": "2.62"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@ubuntu.com"
}