usn-5259-1
Vulnerability from osv_ubuntu
Published
2022-02-01 14:38
Modified
2026-06-25 10:46
Summary
cron vulnerabilities
Details

It was discovered that the postinst maintainer script in Cron unsafely handled file permissions during package install or update operations. An attacker could possibly use this issue to perform a privilege escalation attack. (CVE-2017-9525)

Florian Weimer discovered that Cron incorrectly handled certain memory operations during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9704)

It was discovered that Cron incorrectly handled user input during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9705)

It was discovered that Cron contained a use-after-free vulnerability in its force_rescan_user function. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9706)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2019-9704",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2019-9705",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2019-9706",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "cron",
            "binary_version": "3.0pl1-128ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "cron",
        "purl": "pkg:deb/ubuntu/cron@3.0pl1-128ubuntu2+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0pl1-128ubuntu2+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0pl1-127ubuntu1",
        "3.0pl1-128ubuntu1",
        "3.0pl1-128ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the postinst maintainer script in Cron unsafely\nhandled file permissions during package install or update operations.\nAn attacker could possibly use this issue to perform a privilege\nescalation attack. (CVE-2017-9525)\n\nFlorian Weimer discovered that Cron incorrectly handled certain memory\noperations during crontab file creation. An attacker could possibly use\nthis issue to cause a denial of service. (CVE-2019-9704)\n\nIt was discovered that Cron incorrectly handled user input during crontab\nfile creation. An attacker could possibly use this issue to cause a denial\nof service. (CVE-2019-9705)\n\nIt was discovered that Cron contained a use-after-free vulnerability in\nits force_rescan_user function. An attacker could possibly use this issue\nto cause a denial of service. (CVE-2019-9706)\n",
  "id": "USN-5259-1",
  "modified": "2026-06-25T10:46:03Z",
  "published": "2022-02-01T14:38:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5259-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-9525"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-9704"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-9705"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-9706"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "cron vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2017-9525",
    "UBUNTU-CVE-2019-9704",
    "UBUNTU-CVE-2019-9705",
    "UBUNTU-CVE-2019-9706"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.