{"id":"CVE-2020-8831","state":"PUBLISHED","title":"World writable root owned lock file created in user controllable location","description":"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.","publishedAt":"2020-04-22T21:15:18.418Z","updatedAt":"2024-09-16T19:00:55.009Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","source":"canonical"},"assigner":"canonical","products":["Canonical Apport"],"affected":[{"vendor":"Canonical","product":"Apport","versions":[{"version":"2.20.1","status":"affected","lessThan":"2.20.1-0ubuntu2.23","versionType":"custom"},{"version":"2.20.9","status":"affected","lessThan":"2.20.9-0ubuntu7.14","versionType":"custom"},{"version":"2.20.11","status":"affected","lessThan":"2.20.11-0ubuntu8.8","changes":[{"at":"2.20.11-0ubuntu22","status":"unaffected"}],"versionType":"custom"}]}],"references":["https://launchpad.net/bugs/1862348","https://usn.ubuntu.com/4315-1/","https://usn.ubuntu.com/4315-2/"],"weaknesses":["CWE-379"],"ingestedAt":"2026-10-29T19:47:44.297Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/8xxx/CVE-2020-8831.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-8831","state":"PUBLISHED","datePublished":"2020-04-22T21:15:18.418Z","dateUpdated":"2024-09-16T19:00:55.009Z","assignerShortName":"canonical","assignerOrgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","dateReserved":"2020-02-10T00:00:00.000Z"},"containers":{"cna":{"title":"World writable root owned lock file created in user controllable location","descriptions":[{"lang":"en","value":"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. 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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. 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