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CVE-2017-9525

Status: ModifiedMedium (6.7)—

In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Cron Project — CronDebian — Debian Linux

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2017-9525",
  "cveTags": [],
  "metrics": {
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          "baseScore": 6.9,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
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        "obtainOtherPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
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  "published": "2017-06-09T16:29:02.110",
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          "value": "CWE-59"
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      "lang": "en",
      "value": "In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs."
    },
    {
      "lang": "es",
      "value": "En el paquete cron hasta la versión 3.0pl1-128 en Debian, y hasta la versión 3.0pl1-128ubuntu2 en Ubuntu, el script de mantenimiento postinst permite la escalada de privilegios de grupo-crontab a root por medio de ataques de enlace simbólico (symlink) contra el uso no seguro de los programas chown y chmod."
    }
  ],
  "lastModified": "2026-06-17T01:28:18.113",
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}