{"id":"CVE-2020-8831","details":"Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.","modified":"2026-03-14T07:48:31.729451Z","published":"2020-04-22T22:15:12.513Z","references":[{"type":"ADVISORY","url":"https://usn.ubuntu.com/4315-1/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4315-2/"},{"type":"EVIDENCE","url":"https://launchpad.net/bugs/1862348"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"19.10"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8831.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"}]}