usn-5259-2
Vulnerability from osv_ubuntu
Published
2022-05-06 08:42
Modified
2026-04-27 14:11
Summary
cron vulnerabilities
Details

USN-5259-1 fixed several vulnerabilities in Cron. This update provides the corresponding update for Ubuntu 18.04 LTS.

Original advisory 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:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "cron",
            "binary_version": "3.0pl1-128.1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "cron",
        "purl": "pkg:deb/ubuntu/cron@3.0pl1-128.1ubuntu1.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0pl1-128.1ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0pl1-128ubuntu5",
        "3.0pl1-128.1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-5259-1 fixed several vulnerabilities in Cron. This update provides\nthe corresponding update for Ubuntu 18.04 LTS. \n\nOriginal advisory details:\n\n It was discovered that the postinst maintainer script in Cron unsafely\n handled file permissions during package install or update operations.\n An attacker could possibly use this issue to perform a privilege\n escalation attack. (CVE-2017-9525)\n \n Florian Weimer discovered that Cron incorrectly handled certain memory\n operations during crontab file creation. An attacker could possibly use\n this issue to cause a denial of service. (CVE-2019-9704)\n \n It was discovered that Cron incorrectly handled user input during crontab\n file creation. An attacker could possibly use this issue to cause a denial\n of service. (CVE-2019-9705)\n \n It was discovered that Cron contained a use-after-free vulnerability in\n its force_rescan_user function. An attacker could possibly use this issue\n to cause a denial of service. (CVE-2019-9706)\n",
  "id": "USN-5259-2",
  "modified": "2026-04-27T14:11:27Z",
  "published": "2022-05-06T08:42:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5259-2"
    },
    {
      "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

Author Source Type Date Other

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.