{"id":"UBUNTU-CVE-2018-6557","details":"The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.","modified":"2026-02-04T04:11:48.122021Z","published":"2018-08-21T00:00:00Z","related":["USN-3748-1"],"upstream":["CVE-2018-6557"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6557"},{"type":"REPORT","url":"http://www.sbosnet.nl/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3748-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-6557"}],"affected":[{"package":{"name":"base-files","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/base-files@10.1ubuntu2.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.1ubuntu2.2"}]}],"versions":["9.6ubuntu102","10ubuntu1","10.1ubuntu1","10.1ubuntu2","10.1ubuntu2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"10.1ubuntu2.2","binary_name":"base-files"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6557.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}