{"id":"USN-5259-3","summary":"cron regression","details":"USN-5259-1 and USN-5259-2 fixed vulnerabilities in Cron. Unfortunately\nthat update was incomplete and could introduce a regression. This update\nfixes the problem.\n\nWe apologize for the inconvenience.\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","modified":"2026-06-25T13:30:14.520158123Z","published":"2022-05-11T00:25:41Z","related":["UBUNTU-CVE-2017-9525"],"upstream":["CVE-2017-9525","UBUNTU-CVE-2017-9525"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5259-3"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-9525"},{"type":"REPORT","url":"https://launchpad.net/bugs/1971895"}],"affected":[{"package":{"name":"cron","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/cron?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0pl1-128ubuntu2+esm2"}]}],"versions":["3.0pl1-127ubuntu1","3.0pl1-128ubuntu1","3.0pl1-128ubuntu2","3.0pl1-128ubuntu2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"cron","binary_version":"3.0pl1-128ubuntu2+esm2"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2017-9525","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5259-3.json"}},{"package":{"name":"cron","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/cron?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0pl1-128.1ubuntu1.2"}]}],"versions":["3.0pl1-128ubuntu5","3.0pl1-128.1ubuntu1","3.0pl1-128.1ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"cron","binary_version":"3.0pl1-128.1ubuntu1.2"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2017-9525","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5259-3.json"}}],"schema_version":"1.7.5"}